CA2525463C

CA2525463C - Method and apparatus for spine joint replacement

Info

Publication number: CA2525463C
Application number: CA002525463A
Authority: CA
Inventors: E. Marlowe Goble; T. Wade Fallin; Robert W. Hoy
Original assignee: Facet Solutions Inc
Current assignee: Facet Solutions Inc
Priority date: 2003-05-02
Filing date: 2003-05-02
Publication date: 2009-03-17
Anticipated expiration: 2023-05-02
Also published as: WO2004098465A1; CA2525463A1; AU2003228821B2; AU2003228821A1

Abstract

A prosthesis (1075, 1085, 1160) for the replacement of the cartilaginous structures of a spine motion segment is described. The prosthesis (1075, 108 5, 1160) comprises an intervertebral disc prosthesis (AD) in combination with a facet joint prosthesis (4, 5).

Description

METHOD AND APPARATUS FOR SPINE JOINT REPLACEMENT

Field Of The Invention This invention relates to surgical devices and methods in general, and more particularly to surgical devices and methods for replacing a damaged, diseased, or otherwise painful spinal joint.
Background Of The Invention Traumatic, inflammatory, metabolic, synovial, neoplastic and degenerative disorders of the spine can produce debilitating pain that can have severe socioeconomic and psychological effects.

One of the most common surgical interventions today is arthrodesis, or spine fusion, in which two or more adjacent vertebral bodies are fused together in order to alleviate pain associated with the disc(s) located between those vertebral bodies. Approximately 300,000 such procedures are performed annually in the United States alone. Clinical success varies considerably, depending upon technique and indications, and consideration must be given to the concomitant risks and complications.

For example, while spine fusion generally helps to eliminate certain types of pain, it has also been shown to decrease function by limiting the range of motion for patients in flexion, extension, rotation and lateral bending. Furthermore, it is believed that spine fusion creates increased stresses on (and, therefore, accelerated degeneration of) adjacent non-fused motion segments. Additionally, pseudoarthrosis, resulting from an incomplete or ineffective fusion, may reduce or even totally eliminate the desired pain relief for the patient. Also, the fusion device(s) used to effect fusion, whether artificial or biological, may migrate out of the fusion site, thereby creating significant new problems for the patient.

Recently, attempts have been made to recreate the natural biomechanics of the spine through the use of an artificial disc. Artificial discs are intended to restore articulation between vertebral bodies so as to recreate the full range of motion normally allowed by the elastic properties of the natural disc, which directly connects two opposing vertebral bodies.

Various artificial discs are described by Stefee et al.
in U.S. Pat. No.5,071,437; Gill et al.in U.S. Pat. No.
6,113,637; Bryan et al. in U.S. Pat. No. 6,001,130;

Hedman et al. in U.S. Patent No. 4,759,769; Ray in U.S.
Patent No. 5,527,312; Ray et al. in U.S. Pat.

5,824,093; Buttner-Janz in U.S. Patent No. 5,401,269;
and Serhan et al. in U.S. Patent No. 5,824,094.

Still other artificial discs are known in the art.
Unfortunately, however, artificial discs alone do not adequately address all of the mechanics of the motion of the spinal column.

In addition to the intervertebral disc, posterior elements called the facet joints help to support axial, torsional and shear loads that act on the spinal column. Furthermore, the facet joints are diarthroidal joints that provide both sliding articulation and load transmission features. However, the facet joints can also be a significant source of spinal disorders and, in many cases, debilitating pain. For example, a patient may suffer from arthritic facet joints, severe facet joint tropism or otherwise deformed facet joints, facet joint injuries, etc. There is currently a lack of good interventions for facet joint disorders.
Facetectomy, or the removal of the facet joints, may provide some relief, but it is also believed to produce significant decreases in the stiffness of the spinal column (i.e., hypermobility) in all planes of motion:
flexion and extension, lateral bending, and rotation.

Furthermore, problems with the facet joints can also complicate treatments associated with other portions of the spine. By way of example, contraindications for artificial discs include arthritic facet joints, absent facet joints, severe facet joint tropism or otherwise deformed facet joints.

A superior vertebra with its inferior facets, an inferior vertebra with its superior facets, the intervertebral disc, and seven spinal ligaments together comprise a spinal motion segment or functional is spine unit. The spinal motion segment provides complex motion along three orthogonal axis, both in rotation (lateral bending, flexion and extension, and axial rotation) and in translation (anterior-posterior, medial-lateral, and cranial-caudal). Furthermore, the spinal motion segment provides physiological limits and stiffnesses in each rotational and translational direction to create a stable and strong column structure to support physiological loads.

_ , .~. ~ . . _ As mentioned above, compromised facet joints are a contraindication for disc replacement, due to the inability of the artificial disc (when used with compromised facet joints, or when used with missing facet joints) to properly restore the natural biomechanics of the spinal motion segment. It would therefore be an improvement in the art to provide a spine implant system that facilitates concurrent replacement of the intervertebral disc and facet joints where both have been compromised due to disease or trauma.

U.S. Pat. No. Re. 36,758 (Fitz) discloses an artificial facet joint where the inferior facet, the mating superior facet, or both, are covered with a cap.

This cap requires no preparation of the bone or articular surfaces; it covers and, therefore, preserves the bony and articular structure. The capping of the facet has several potential disadvantages, however.

If the facet joint is osteoarthritic, a cap will not remove the source of the pain. Additionally, at least in the case of surface replacements for osteoarthritic femoralheads, the capping of articular bone ends has proven to lead to clinical failure by means of mechanical loosening. This clinical failure is hypothesized to be a sequela of disrupting the periosteum and ligamentum teres femoris, both serving a nutrition delivery role to the femoral head, thereby leading to avascular necrosis of the bony support structure for the surface replacement. It is possible that corresponding problems could develop from capping the facet. Another potential disadvantage of facet capping is that in order to accommodate the wide variability in anatomical morphology of the facets, not only between individuals but also between levels within the spinal column, a very wide range of cap sizes and shapes is required.

U.S. Pat. No. 6,132,464 (Martin) discloses a spinal facet joint prosthesis that is supported on the lamina (which is sometimes also referred to as the posterior arch). Extending from this support structure are inferior and/or superior blades that replace the cartilage at the facet joint. Like the design of the aforementioned U.S. Pat. No. Re. 36,758, the prosthesis of U.S. Pat. No. 6,132,464 generally preserves existing bony structures and therefore does not address pathologies which affect the bone of the facets in addition to affecting the associated cartilage. Furthermore, the prosthesis of U.S. Pat. No.
6,132,464 requires a secure mating between the prosthesis and the lamina. However, the lamina is a very complex and highly variable anatomical surface. As a result, in practice, it is very difficult to design a prosthesis that provides reproducible positioning against the lamina so as to correctly locate the cartilage-replacing blades for the facet joints.

Another approach to surgical intervention for spinal facets is disclosed in International Patent Publication No. WO9848717A1 (Villaret et al.). While this publication teaches the replacement of spinal facets, the replacement is interlocked in a manner so as to immobilize the joint.

Thus it will be seen that previous attempts to provide facet joint replacement have proven inadequate.
In some circumstances, additional structures of a vertebra beside the facets may have been compromised by disease or trauma. For example, the lamina, the spinous process and/or the two transverse processes may have been compromised by disease or trauma. In such a circumstance, it would be useful to have a prosthesis which would allow the replacement of the same.
Summary Of The Invention One object of the present invention is to provide a spine joint reconstruction assembly that replaces the intervertebral disc and one or more of the facet joints in order to restore the natural biomechanics of a spinal motion segment.

Another object of the present invention is to provide a method for reconstructing the spine joint by replacing the intervertebral disc and one or more of the facet joints in order to restore the natural biomechanics of a spinal motion segment.

Still another object of the present invention is to provide a kit for the reconstruction of multiple spine joints to replace intervertebral discs and facet joints in order to restore the natural biomechanics of a spinal joint motion segment.

In accordance with the present invention, the preferred embodiment, the intervertebral disc is excised and replaced with an artificial disc. This artificial disc may be a device such as is described by Stefee et al. in U.S. Pat. No. 5,071,437; Gill et al. in U.S. Pat. No. 6,113,637; Bryan et al. in U.S. Pat. No.
6,001,130; Hedman et al. in U.S. Patent No. 4,759,769;
Ray in U.S. Patent No. 5,527,312; Ray et al. in U.S.

Pat. No. 5,824,093; Buttner-Janz in U.S. Patent No.
5,824,094; and Serhan et al. in U.S. Patent No.
5,824,099. Alternatively, the artificial disc may be some other artificial disc of the sort known in the art.

In addition to replacing the intervertebral disc, at least one of the facet joints is replaced in accordance with the apparatus and methods described hereinafter. Alternatively, the facet joints may be replaced as described by Fitz in U,S. Pat. No. Re.
36,758; Martin in U.S. Pat. No. 6,132,464; and/or Villaret et al. in International Patent Publication No.
WO 9848717A1. Or one or more of the facet joints may be replaced by other apparatus and methods known in the art.

The present invention has several advantages over the prior art. For one thing, the present invention can provide a complete replacement of all of the articulation surfaces of a spine motion segment: the intervertebral disc and the facet joints. Proper disc height is restored while degenerated facet joints and the underlying painful bone is replaced. The prosthetic disc and prosthetic facet joints work together to reproduce the desired physiological range of motion and to provide low friction articulations, so that adjacent motion segments are returned to physiological levels of stress and strain. Furthermore, osteophytic growth can be concurrently removed, and the artificial disc and facet joint prosthesis together reestablish intervertebral and central foraminal spaces to ensure decompression of any nerve structure. Thus, all sources of pain, such as pain associated with osteoarthritis, instability, and nerve compression, are removed while restoring full function of the spine motion segment.
Brief Description Of The Drawings These and other objects and features of the present invention will be more fully disclosed or rendered obvious by the following detailed description of the preferred embodiments of the invention, which is to be considered together with the accompanying drawings wherein like numbers refer to like parts and further wherein:

FIG. 1 is a perspective view of a portion of the spine;

FIG. 2 is a dorsal view of the portion of the spine shown in FIG. 1;

FIG. 3 is a lateral view of a spine joint reconstructed in accordance with one aspect of the present invention;

FIG. 4 is a dorsal view of the facet joint shown in FIG. 3;

FIG. 5 is a perspective view of the implanted left inferior facet prosthesis shown in FIGS. 3 and 4;

FIG. 6 is a perspective view of the left inferior facet prosthesis shown in FIGS. 3 and 4;

FIG. 7 is a cranial view of the implanted left superior facet prosthesis shown in FIGS. 3 and 4;

FIG. 8 is a perspective view of the left superior facet prosthesis shown in FIGS. 3 and 4;

FIG. 9 is a perspective view of an alternate implanted left superior facet prosthesis;

FIG. 10 is a perspective view of an alternate left superior facet prosthesis;

FIG. 11 is a lateral view of an alternative reconstructed spine joint;

FIG. 12 is a dorsal view of an alternative reconstructed spine joint;

FIG. 13 is a perspective view of the implanted left inferior facet prosthesis shown in FIGS. 11 and 12;

FIG. 14 is a perspective view of the alternative left inferior facet prosthesis shown in FIGS. 11 and 12;
FIG. 15 is a cranial view of the alternative implanted left superior facet prosthesis shown in FIGS.
11 and 12;

FIG. 16 is a perspective view of the alternative left superior facet prosthesis shown in FIGS. 11 and 12;
FIG. 17 is a perspective view of an alternate bearing surface for the superior facet prosthesis shown in FIG. 16;

FIG. 18 is a perspective view of a spine motion segment;

FIG. 19 is a dorsal view of a bilateral facet joint reconstructed in accordance with the present invention;
FIG. 20 is a lateral view of the bilateral facet joint prosthesis shown in FIG. 19;

FIG. 21 is a dorsal view of the implanted inferior bilateral facet prosthesis shown in FIGS. 19 and 20;
FIG. 22 is an inferior view of the implanted inferior bilateral facet prosthesis shown in FIGS. 19 and 20;

FIG. 23 is a ventral view of the inferior bilateral facet prosthesis shown in FIGS. 21 and 22;

FIG. 24 is a dorsal view of the implanted superior bilateral facet prosthesis shown in FIGS. 19 and 20;
FIG. 25 is a superior view of the implanted superior bilateral facet prosthesis shown in FIGS. 19 and 20 FIG. 26 is a ventral view of the superior bilateral facet prosthesis shown in FIGS. 24 and 25;

FIG. 27 is a perspective view of an alternative embodiment of the superior bilateral facet prosthesis shown in FIGS. 24 and 25;

FIG. 28 is a dorsal view of a two level facet joint replacement;

FIG. 29 is a lateral view of the two level facet joint replacement of FIG. 28;

FIG. 30 is a dorsal view of the implanted four facet prosthesis shown in FIGS. 28 and 29;

FIG. 31 is a perspective view of the four facet prosthesis shown in FIG. 30;

FIG. 32 is a perspective view of an alternative form of inferior bilateral facet prosthesis;

FIG. 33 is a perspective view of an implanted superior and inferior unilateral facet prosthesis;
FIG. 34 is a perspective view of the unilateral facet prosthesis shown in FIG. 33;

FIG. 35 is a perspective view of a lumbar vertebra;
FIG. 36 is a perspective view of a novel prosthesis that replaces the lamina, the four facets, the spinous process and the two transverse processes of a vertebra;

FIG. 37 is an anterior view of the prosthesis shown in FIG. 36;

FIG. 38 is a perspective view of a vertebra which has been resected to receive the prosthesis shown in FIG. 36 FIG. 39 is a perspective view of the prosthesis shown in FIG. 36 mounted to the resected vertebra shown in FIG. 38;

FIG. 40 is a dorsal view of the prosthesis shown in FIG. 36 mounted to the resected vertebra shown in FIG.
38;

FIG. 41 is a lateral view of the prosthesis shown in FIG. 36 mounted to the resected vertebra shown in FIG. 38;

FIG. 42 is a perspective view of a novel prosthesis that replaces the lamina, the four facets and the spinous process of a vertebra;

FIG. 43 is a perspective view of a novel prosthesis that replaces the lamina, the four facets and the two transverse processes of a vertebra;

FIG. 44 is a perspective view of a novel prosthesis that replaces the lamina and the four facets of a vertebra;

FIG. 45 is a perspective view of a novel prosthesis that replaces the two pedicles, the lamina, the four facets, the spinous process and the two transverse processes of a vertebra;

FIG. 46 is a lateral view of the prosthesis shown in FIG. 45;

FIG. 47 is an anterior view of the prosthesis shown in FIG. 45;

FIG. 48 is a perspective view of a vertebra which has been resected to receive the prosthesis shown in FIG. 45;

FIG. 49 is a perspective view showing the prosthesis of FIG. 45 mounted to the resected vertebra shown in FIG. 48;

FIG. 50 is a perspective view of a novel prosthesis that replaces the two pedicles, the lamina, the four facets and the spinous process of a vertebra;

FIG. 51 is a perspective view of a novel prosthesis that replaces the two pedicles, the lamina, the four facets and the two transverse processes of a vertebra;

FIG. 52 is a perspective view of a novel prosthesis that replaces the two pedicles, the lamina and the four facets of a vertebra; and FIG. 53 is a perspective view showing an alternative arrangement for mounting the prosthesis of FIG. 45 to a vertebra.

Detailed Description of the Preferred Embodiments Disc Prosthesis and Single Facet Prosthesis Referring now to FIGS. 1 and 2, there is shown a superior vertebra 1 and an inferior vertebra 3, with an intervertebral disc 2 located in between. Vertebra 1 has superior facets 43, inferior facets 6, posterior arch 35 and spinous process 46. Vertebra 3 has superior facets 7, inferior facets 44, posterior arch 36 and spinous process 45.

Referring now to FIG. 3, in accordance with one aspect of the present invention, the intervertebral disc 2 has been replaced by an artificial disc AD. This artificial disc AD may be a device such as is described by Stefee et al. in U.S. Pat. No. 5,071,437; Gill et al.
in U.S. Pat. No. 6,113,637; Bryan et al. in U.S. Pat.
No. 6,001,130; Hedman et al. in U.S. Pat. No. 4,759,769;

Ray in U.S. Pat. No. 5,527,312; Ray et al. in U.S. Pat.
No. 5,824,093; Buttner-Janz in U.S. Patent No. 5,401,269; and Serhan et al. in U.S. Pat. No.
5,824,094. Alternatively, the artificial disc may be some other artificial disc of the sort known in the art.

In addition to the foregoing, the left inferior facet 6 of vertebra 1 has been resected and an inferior facet prosthesis 4 has been attached to vertebra 1.
Similarly, the left superior facet of vertebra 3 has been resected and a superior facet prosthesis 5 has been attached to vertebra 3.

FIG. 4 illustrates a dorsal view of the elements shown in FIG. 3. It can be appreciated that inferior facet prosthesis 4 replicates the natural anatomy when compared to the contralateral inferior facet 6 of vertebra 1. Similarly, it can be appreciated that superior facet prosthesis 5 replicates the natural anatomy when compared to the contralateral superior facet 7 of vertebra 3.

Turning now to FIG. 5, a perspective view of vertebra 1 with implanted inferior facet prosthesis 4 is provided. Resection at 31 has removed the natural inferior facet 6 at the bony junction between the . .. . ..._.. .._...: i......_ ._... ....... ..._. ...... ..__... ._...._.~.
,....:.... .. ...... ...._.... ..__..__ , _..._. ..,., .__.._..._....

facet 6 and the posterior arch 35. In this manner, bone pain associated with a disease, such as osteoarthritis, or trauma may be eliminated as the involved bony tissue has been osteotomized.

FIG. 6 illustrates a perspective view of inferior facet prosthesis 4. Surface 8 replicates the natural articular surface of the replaced inferior facet 6. Post 9 provides a means to affix inferior facet prosthesis 4 to vertebra 1. Post 9 is implanted into the interior bone space of the left pedicle P (FIG. 7) on vertebra 1 and may or may not extend into the vertebral body of vertebra 1 to provide additional stability.

FIG. 7 illustrates a cranial view of vertebra 3 with implanted superior facet prosthesis 5. Resection surface 32 represents the bony junction between the natural superior facet and the posterior arch 35.

FIG. 8 illustrates a perspective view of superior facet prosthesis 5. Surface 36 replicates the natural articular surface of the replaced superior facet 7. Post 37 provides a means for affixing superior facet prosthesis 5 to vertebra 3. Post 37 is implanted into the interior bone space of the left pedicle P (FIG. 7) on vertebra 3 and may or may not extend into the vertebral body of vertebra 3 to provide additional stability.

When the total facet joint is replaced, as shown in FIGS. 3 and 4, then surface 8 (FIG. 6) articulates with surface 36 (FIG. 8) to recreate the natural biomechanics of the spine motion segment made up of vertebra 1, vertebra 3, and intervertebral disc 2.

FIG. 9 illustrates an alternative inferior facet prosthesis 10 which is implanted into the interior bone space of posterior arch 35. The interior bone space is accessed from the resection 31.

FIG. 10 shows details of alternative inferior facet prosthesis 10, including the fin 13 that extends into the interior bone space of posterior arch 35. Surface 12 replicates the natural articular surface of the replaced facet.

If desired, a corresponding fin construction can be used to form a prosthetic superior facet.

The surfaces of post 9 (FIG. 6), post 37 (FIG. 8) and fin 13 (FIG. 10) may or may not include porous coatings to facilitate bone ingrowth to enhance the long term fixation of the implant. Furthermore, such porous coatings may or may not include osteoinductive or osteoconductive substances to further enhance the bone remodeling into the porous coating.

Referring now to FIG. 11, there is shown a lateral view of a superior vertebra 14 and an inferior vertebra 16, with an intervertebral disc 15 located in between is shown. The left inferior facet of vertebra 14 has been resected and an inferior facet prosthesis 18 has been attached to vertebra 14 by means of a screw fastener 17.

Similarly, the left superior facet of vertebra 16 has been resected and a superior facet prosthesis 19 has been attached to vertebra 16 by means of a screw fastener 17.

FIG. 12 illustrates a dorsal view of the elements of FIG. 11. It can be appreciated that inferior facet prosthesis 18 replicates the natural anatomy when compared to the contralateral inferior facet 22 of vertebra 14. Similarly, it can be appreciated that superior facet prosthesis 19 replicates the natural anatomy when compared to the contralateral superior facet 21 of vertebra 16.

Turning now to FIG. 13, there is provided a perspective view of vertebra 14 with implanted inferior facet prosthesis 18. Resection 34 has removed the natural inferior facet at the bony junction between the inferior facet and the posterior arch 37. In this manner, bone pain associated with a disease, such as osteoarthritis, or trauma may be eliminated inasmuch as the involved bony tissue has been osteotomized.

FIG. 14 illustrates a perspective view of inferior facet prosthesis 18. Surface 23 replicates the natural articular surface of the replaced facet. Flange 25 contacts the pedicle and hole 24 receives a fastener to attach inferior facet prosthesis 18 to vertebra 14.
FIG. 15 illustrates a cranial view of vertebra 16 with implanted superior facet prosthesis 19. Resection surface 35 represents the bony junction between the natural superior facet and the posterior arch 38.

FIG. 16 illustrates a perspective view of superior facet prosthesis 19. Surface 27 replicates the natural articular surface of the replaced facet. Flange 39 contacts the pedicle and hole 26 receives a fastener to attach inferior facet prosthesis 19 to vertebra 16.
FIG. 17 illustrates an alternative superior facet prosthesis 40 with an bearing surface 41 that mounts to substrate 42. The bearing surface 41 is a biocompatible polymeric material, such as ultra high molecular weight polyethylene. Alternately, the bearing surface can be ceramic, such as zirconia or alumina, or metal. The substrate is a biocompatible metal alloy, such as an alloy of titanium, cobalt, or iron.
Disc Prosthesis and Double Facet Prosthesis Referring next to FIG. 18, there is shown a superior vertebra 1005 and an inferior vertebra 1010, with an intervertebral disc 1015 located in between.
Vertebra 1005 has superior facets 1020, inferior facets 1025, a lamina (also sometimes referred to as a posterior arch) 1030, a spinous process 1035, and pedicles 1040. Vertebra 1010 has superior facets 1045, inferior facets 1050, a posterior arch 1055, a spinous process 1060, and pedicles 1065 (only one of which is seen in FIG. 18).

Referring now to FIGS. 19 and 20, in accordance with another aspect of the invention, intervertebral disc 1015 has been replaced by an artificial disc AD.

This artificial disc AD may be a device such as is described by Stefee et al. in U.S. Pat. No. 5,071,437;

Gill et al. in U.S. Patent No. 6,113,637; Bryan et al.
in U.S. Pat. No. 6,001,130; Hedman et al. in U.S. Patent No. 4,759,769; Ray in U.S. Patent No. 5,527,312; Ray et al. in U.S. Pat. 5,824,093; Buttner-Janz in U.S. Patent No. 5,401,269; and Serhan et al. in U.S. Patent No.

5,824,094. Alternatively, the artificial disc may be some other artificial disc of the sort known in the art.
In addition to the foregoing, the left and right inferior facets 1025 of vertebra 1005 have been resected at 1070 and a bilateral inferior facet prosthesis 1075 has been attached to vertebra 1005 using screw fasteners 1080. Similarly, the left and right superior facets 1045 of vertebra 1010 have been resected at 1082 (Fig. 24) and a bilateral superior facet prosthesis 1085 has been attached to vertebra 1010 using screw fasteners 1090.

In Fig. 20 it can be appreciated that bilateral inferior facet prosthesis 1075 replicates the natural anatomy when compared to the intact inferior facet 1025 of vertebra 1005. Furthermore, bilateral facet prosthesis 1075 extends from its attachment point in a manner that does not require contact with, or mating to, the complex geometry of the lamina (or posterior arch) 1030. Resection surfaces 1070 provide adequate clearance for bilateral inferior facet prosthesis 1075 and provide complete removal of the diseased or traumatized natural inferior facets 1025.

FIGS. 21 and 22 illustrate how the geometry of the bridge 1095 of bilateral inferior facet prosthesis 1075 matches that of the posterior arch 1030 of vertebra 1005 in order to provide adequate clearance for the central foramen 1100. Articular surfaces 1105 articulate with the opposing superior facets 1045 (or their prosthetic replacements) of the vertebra 1010.

FIG. 23 illustrates the bilateral inferior facet prosthesis 1075 with flanges 1110 that abut against the pedicles 1040 of vertebra 1005. Bridge 1095 connects the articular surfaces 1105. Holes 1115 allow the attachment of bilateral inferior facet prosthesis 1075 to vertebra 1005 by means of screw fasteners 1080. Alternatively, screw fasteners 1080 could be replaced with staples, pins, tacks, anchors, modular fixation posts, or the like. These alternative fasteners could further include porous coatings to further enhance bony fixation, and could also include osteoconductive or osteoinductive substances.

In FIG. 24 it can be appreciated that bilateral superior facet prosthesis 1085 replicates the natural anatomy when compared to the intact superior facets 1045 of vertebra 1010. Furthermore, bilateral facet prosthesis 1085 extends from its attachment point in a manner that does not require contact with, or mating to, the complex geometry of the lamina (or posterior arch) 1055. Resection surfaces 1082 provide adequate clearance for bilateral superior facet prosthesis 1085 and provide complete removal of the diseased or traumatized natural superior facets 1045.

FIG. 25 illustrates how the geometry of the bridge 1120 of bilateral superior facet prosthesis 1085 matches that of the posterior arch 1055 of vertebra 1010 in order to provide adequate clearance for the central foramen 1125. Articular surfaces 1130 articulate with the opposing inferior facets of the vertebra 1005.

FIG. 26 illustrates the bilateral superior facet prosthesis 1085 with flanges 1135 that abut against the pedicles 1065 of vertebra 1010. Bridge 1120 connects the articular surfaces 1130 (seen in FIG. 25 but not seen in FIG. 26). Holes 1140 allow the attachment of bilateral superior facet prosthesis 1085 to vertebra 1010 by means of screw fasteners 1090.

FIG. 27 illustrates an alternative superior facet prosthesis 1085A with a bearing surface 1130A that mounts to substrate 1131A. The bearing surface 1130A is preferably a biocompatible polymeric material, such as ultra high molecular weight polyethylene. Alternately, the bearing surface 1130A can be ceramic, such as zirconia or alumina. The substrate 1131A is preferably a biocompatible metal alloy, such as an alloy of titanium, cobalt, or iron.

FIG. 28 illustrates a superior vertebra 1145, a middle vertebra 1150, and an inferior vertebra 1155.
Superior facet prosthesis 1085 articulates with quad-facet prosthesis 1160 to recreate the natural biomechanics of the replaced facet joints. Inferior facet prosthesis 1075 articulates with quad-facet prosthesis 1160 to recreate the natural biomechanics of the replaced facet joints at the next upper level. Thus, FIG. 28 illustrates a two level reconstruction of facet joints. Superior facet prosthesis 1085, quad-facet prosthesis 1160, and inferior facet prosthesis 1075 are each attached to bone by means of screw fasteners 1165.

In the lateral view of FIG. 29, it can be appreciated that superior facet prosthesis 1085, quad-facet prosthesis 1160, and inferior facet prosthesis 1075 do not encroach into the intervertebral foraminal spaces 1167 where nerve roots extend laterally from the spinal cord.

Referring next to FIG. 30, it should be appreciated that superior bridge 1170 and inferior bridge 1175 of quad-facet prosthesis 1160 do not contact any portion of vertebra 1150. Mounting holes 1180 (shown in FIG. 31) are used to secure the flanges 1185 against the pedicles of vertebra 1150.

In FIG. 32, an alternative inferior bilateral facet prosthesis 1190 is presented. To further stabilize the implant and to counter moments that act upon the two points of fixation into the pedicles, a set of parallel flanges 1195 extend posteriorly such that the two flanges straddle the spinous process 1035. A bolt 1200 is used to fasten the parallel flanges to the spinous process. Alternatively, other adjunctive structural features could be added to further stabilize the prosthesis. For example, a strut that extends, and attaches, to the transverse process could be used to further stabilize the prosthesis.

Looking next at FIGS. 33 and 34, there is shown a superior and inferior unilateral facet prosthesis 1300.
Unilateral facet prosthesis 1300 comprises a body 1305 and a stem 1310 extending out of body 1305. A superior element 1315 extends vertically upward from body 1305, and an inferior element 1310 extends vertically downward from body 1305. Unilateral facet prosthesis 1300 is configured so that when its stem 1310 extends into the pedicle of vertebra 1325, superior element 1315 will replace a resected superior facet, and inferior element 1320 will replace a resected inferior facet. If desired, stem 1310 could be replaced with a screw extending through a hole in body 1305 and into the pedicle.

Disc Prosthesis and Quadruple Facet Prosthesis Referring next to FIG. 35, there is shown a natural lumbar vertebra 2005 comprising a natural vertebral body 2010, a pair of natural pedicles 2015 extending from natural vertebral body 2010, a natural lamina 2020 extending from natural pedicles 2015, a pair of natural superior facets 2025 extending from natural pedicles 2015 and natural lamina 2020, a pair of natural inferior facets 2030 extending from natural lamina 2020, a natural spinous process 2035 extending from natural lamina 2020, and a pair of natural transverse processes 2040 extending from natural pedicles 2015.

In accordance with another aspect of the invention, the intervertebral disc on one side or the other of vertebral body 2010 is replaced by an artificial disc. This artificial disc may be a device such as is described by Stefee et al. in U.S. Pat. No.

5,071,437; Gill et al. in U.S. Pat. No. 6,113,637;
Bryan et al. in U.S. Patent No. 6,001,130; Hedman et al.
in U.S. Patent No. 4,759,769; Ray in U.S. Patent No.
5,527,312; Ray et al. in U.S. Pat. 5,824,093; Buttner-Janz in U.S. Patent No. 5,401,269; and Serhan et al. in U.S. Patent No. 5,824,094. Alternatively, the artificial disc may be some other artificial disc of the sort known in the art.

In addition to the foregoing, and looking next at FIGS. 36 and 37, there is shown a novel prosthesis 2100 which is adapted to replace the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040. To this end, prosthesis 2100 comprises a pair of prosthetic mounts 2115, a prosthetic lamina 2120 extending from prosthetic mounts 2115, a pair of prosthetic superior facets 2125 extending from prosthetic mounts 2115 and prosthetic lamina 2120, a pair of prosthetic inferior facets 2130 extending from prosthetic lamina 2120, a prosthetic spinous process 2135 extending from prosthetic lamina 2120, and a pair of prosthetic transverse processes 2140 extending from prosthetic mounts 2115.

In the use of prosthesis 2100, natural lumbar vertebra 2005 is resected at its natural pedicles 2015 so as to remove the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, leaving a pair of pedicle end surfaces 2041 (FIG. 38). Then the prosthesis 2100 may be attached to the natural pedicles 2015, e.g., by placing prosthetic mounts 2115 against pedicle surfaces 2041 and then passing screws 2145 through screw holes 2147 and into natural pedicles 2015, as shown in FIGS. 39-41. As seen in the drawings, the relative size, shape and positioning of the prosthetic lamina 2120, the two prosthetic superior facets 2125, the two prosthetic inferior facets 2130, the prosthetic spinous process 2135, and the two prosthetic transverse processes 2140 essentially mimic the relative size, shape and positioning of the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in the prosthetic spinous process 2135 and/or the two prosthetic transverse processes 2140 so as to facilitate re-attaching soft tissue to these structures.

Looking next at FIG. 42, there is shown a novel prosthesis 2200 which is adapted to replace natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and natural spinous process 2035. To this end, prosthesis 2200 comprises a pair of prosthetic mounts 2215, a prosthetic lamina 2220 extending from prosthetic mounts 2215, a pair of prosthetic superior facets 2225 extending from prosthetic mounts 2215 and prosthetic lamina 2220, a pair of prosthetic inferior facets 2230 extending from prosthetic lamina 2220, and a prosthetic spinous process 2235 extending from prosthetic lamina 2220.

In the use of prosthesis 2200, natural lumbar vertebra 2005 is resected at its natural pedicles 2015 so as to remove the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the spinous process 2035 and the two natural transverse processes 2040, leaving a pair of pedicle surfaces 2041 (FIG. 38). Then the prosthesis 2200 may be attached to the natural pedicles 2015, e.g., by placing prosthetic mounts 2215 against pedicle surfaces 2041 and then passing screws 2145 through holes 2247 and into natural pedicles 2015. As seen in the drawing, the relative size, shape and positioning of prosthetic lamina 2220, the two prosthetic superior facets 2225, the two prosthetic inferior facets 2230, and the prosthetic spinous process 2235 essentially mimic the relative size, shape and positioning of the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the natural spinous process 2035, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in the prosthetic spinous process 2235 so as to facilitate re-attaching soft tissue to this structure.

Looking next at FIG. 43, there is shown a novel prosthesis 2300 which is adapted to replace the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the two natural transverse processes 2040. To this end, prosthesis 2300 comprises a pair of prosthetic mounts 2315, a prosthetic lamina 2320 extending from prosthetic mounts 2315, a pair of prosthetic superior facets 2325 extending from prosthetic mounts 2315 and prosthetic lamina 2320, a pair of prosthetic inferior facets 2330 extending from prosthetic lamina 2320, and a pair of prosthetic transverse processes 2340 extending from prosthetic mounts 2315.

In the use of prosthesis 2300, natural lumbar vertebra 2005 is resected at natural pedicles 2015 so as to remove natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035 and the two natural transverse processes 2040, leaving a pair of pedicle surfaces 2041 (FIG. 38). Then the prosthesis 2300 may be attached to the natural pedicles 2015, e.g., by placing prosthetic mounts 2315 against pedicle surfaces 2041 and then passing screws 2145 through holes 2347 and into natural pedicles 2015. As seen in the drawing, the relative size, shape and positioning of the prosthetic lamina 2320, the two prosthetic superior facets 2325, the two prosthetic inferior facets 2330, and the two prosthetic transverse processes 2340 essentially mimic the relative size, shape and positioning of the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the two natural transverse processes 2040, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in the two prosthetic transverse processes 2340 so as to facilitate re-attaching soft tissue to these structures.

Looking next at FIG. 44, there is shown a novel prosthesis 2400 which is adapted to replace the natural lamina 2020, the two natural superior facets 2025, and the two natural inferior facets 2030. To this end, prosthesis 2400 comprises a pair of prosthetic mounts 2415, a prosthetic lamina 2420 extending from prosthetic mounts 2415, a pair of prosthetic superior facets 2425 extending from prosthetic mounts 2415 and prosthetic lamina 2420, and a pair of prosthetic inferior facets 2430 extending from prosthetic lamina 2420.

In the use of prosthesis 2400, natural lumbar vertebra 2005 is resected at pedicles 2015 so as to remove the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, leaving a pair of pedicle surfaces 2041 (FIG. 38). Then the prosthesis 2400 may be attached to the natural pedicles 2015, e.g., by placing prosthetic mounts 2415 against pedicle surfaces 2041 and then passing screws 2145 through holes 2447 and into natural pedicles 2015. As seen in the drawing, the relative size, shape and positioning of prosthetic lamina 2420, the two prosthetic superior facets 2425, and the two prosthetic inferior facets 2430 essentially mimic the relative size, shape and positioning of the natural lamina 2020, the two natural superior facets 2025 and the two natural inferior facets 2030, whereby to effectively restore the vertebra.
Looking next at FIGS. 45-47, there is shown a novel prosthesis 2500 which is adapted to replace a pair of natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040. To this end, prosthesis 2500 comprises a pair of prosthetic pedicles 2515, a prosthetic lamina 2520 extending from prosthetic pedicles 2515, a pair of prosthetic superior facets 2525 extending from prosthetic pedicles 2515 and prosthetic lamina 2520, a pair of prosthetic inferior facets 2530 extending from prosthetic lamina 2520, a prosthetic spinous process 2535 extending from prosthetic lamina 2520, and a pair of prosthetic transverse processes 2540 extending from prosthetic pedicles 2515.

In the use of prosthesis 2500, natural lumbar vertebra 2005 is resected at the bases of natural pedicles 2015 so as to remove to two natural pedicles 2015, the natural lumina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, leaving a vertebral body end face 2042 (FIG. 48). Then the prosthesis 2500 may be attached to the natural vertebral body 2010, e.g., by placing prosthetic pedicles 2515 against vertebral body end face 2042 and then passing screws 2145 through holes 2547 and into natural vertebral body 2010, as shown in FIG. 49. As seen in the drawings, the relative size, shape and positioning of the two prosthetic pedicles 2515, the prosthetic lamina 2520, the two prosthetic superior facets 2525, the two prosthetic inferior facets 2530, the prosthetic spinous process 2535, and the two prosthetic transverse processes 2540 essentially mimic the relative size, shape and positioning of the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in prosthetic spinous process 2535 and the two prosthetic transverse processes 2540 so as to facilitate re-attaching soft tissue to these structures.
Looking next at FIG. 50, there is shown a novel prosthesis 2600 which is adapted to replace the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the natural spinous process 2035. To this end, prosthesis 2600 comprises a pair of prosthetic pedicles 2615, a prosthetic lamina 2620 extending from prosthetic pedicles 2615, a pair of prosthetic superior facets 2625 extending from prosthetic pedicles 2615 and prosthetic lamina 2620, a pair of prosthetic inferior facets 2630 extending from prosthetic lamina 2620, and a prosthetic spinous process 2635 extending from prosthetic lamina 2620.

In the use of prosthesis 2600, natural lumbar vertebra 2005 is resected at the bases of natural pedicles 2015 so as to remove the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035 and the two natural transverse processes 2040, leaving a vertebral body end face 2042 (FIG. 48). Then the prosthesis 2600 may be attached to the natural vertebral body 2010, e.g., by placing prosthetic pedicles 2615 against vertebral body end face 2042 and then passing screws 2145 through holes 2647 and into natural vertebral body 2010. As seen in the drawing, the relative size, shape and positioning of the two prosthetic pedicles 2615, the prosthetic lamina 2620, the two prosthetic superior facets 2625, the two prosthetic inferior facets 2630, and the prosthetic spinous process 2635 essentially mimic the relative size, shape and positioning of the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the natural spinous process 2035, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in prosthetic spinous process 2635 so as to facilitate re-attaching soft tissue to this structure.
Looking next at FIG. 51, there is shown a novel prosthesis 2700 which is adapted to replace the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the two natural transverse processes 2040. To this end, prosthesis 2700 comprises a pair of prosthetic pedicles 2715, a prosthetic lamina 2720 extending from prosthetic pedicles 2715, a pair of prosthetic superior facets 2725 extending from prosthetic pedicles 2715 and prosthetic lamina 2720, a pair of prosthetic inferior facets 2730 extending from prosthetic lamina 2720, and a pair of prosthetic transverse processes 2740 extending from prosthetic pedicles 2715.

In the use of prosthesis 2700, natural lumbar vertebra 2005 is resected at the bases of natural pedicles 2015 so as to remove the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, leaving a vertebral body end face 2042 (FIG. 48). Then the prosthesis 2700 may be attached to the natural vertebral body 2010, e.g., by placing prosthetic pedicles 2715 against vertebral body end face 2042 and then passing screws 2145 through holes 2747 and into vertebral body 2010. As seen in the drawing, the relative size, shape and positioning of the two prosthetic pedicles 2715, the prosthetic lamina 2720, the two prosthetic superior facets 2725, the two prosthetic inferior facets 2730, and the two prosthetic transverse processes 2740 essentially mimic the relative size, shape and positioning of the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, and the two natural transverse processes 2040, whereby to effectively restore the vertebra. If desired, holes 2150 may be provided in the two prosthetic transverse processes 2740 so as to facilitate re-attaching soft tissue to these structures.

Looking next at FIG. 52, there is shown a novel prosthesis 2800 which is adapted to replace the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, and the two natural inferior facets 2030. To this end, prosthesis 2800 comprises a pair of prosthetic pedicles 2815, a prosthetic lamina 2820 extending from prosthetic pedicles 2815, a pair of prosthetic superior facets 2825 extending from prosthetic pedicles 2815 and prosthetic lamina 2820, and a pair of prosthetic inferior facets 2830 extending from prosthetic lamina 2820.

In the use of prosthesis 2800, natural lumbar vertebra 2005 is resected at the bases of natural pedicles 2015 so as to remove the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, the two natural inferior facets 2030, the natural spinous process 2035, and the two natural transverse processes 2040, leaving a vertebral body end face 2042 (FIG. 48). Then the prosthesis 2800 may be attached to natural vertebral body 2010, e.g., by placing prosthetic pedicles 2715 against vertebral body end face 2042 and then passing screws 2145 through holes 2847 and into natural vertebral body 2010. As seen in the drawing, the relative size, shape and positioning of the two prosthetic pedicles 2815, the prosthetic lamina 2820, the two prosthetic superior facets 2825, and the two prosthetic inferior facets 2830 essentially mimic the relative size, shape and positioning of the two natural pedicles 2015, the natural lamina 2020, the two natural superior facets 2025, and the two natural inferior facets 2030, whereby to effectively restore the vertebra.

It should also be appreciated that prostheses 2100, 2200, 2300, 2400, 2500, 2600, 2700 and 2800 may be attached to natural vertebra 2005 with apparatus other than the screws 2145 discussed above. Thus, for example, prostheses 2100, 2200, 2300, 2400, 2500, 2600, 2700 and 2800 may be attached to natural vertebra 2005 with rods or posts, etc. See, for example, FIG. 53, where prosthesis 2500 is shown attached to natural vertebra 2005 with rods 2146 which pass through, and snap into engagement with, prosthetic pedicles 2515.

Having thus described preferred embodiments of the invention with reference to the accompanying drawings, it is to be understood that the embodiments shown herein are provided by way of example only, and that various changes and modifications may be effected by one skilled in the art without departing from the scope or spirit of the invention as defined in the claims.

Claims

WHAT IS CLAIMED IS:

1. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of at least a portion of the bone of a facet located on a mammalian vertebra, comprising:

a surface that articulates with another facet surface; and a fixation portion that is implanted into an interior bone space of said vertebra, said surface being connected to said fixation portion;

wherein said artificial disc and said prosthesis are configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising said vertebra, said prosthesis and said artificial disc.

2. The kit of claim 1 wherein said fixation portion is a post that is adapted to be fitted into the interior bone space of a pedicle.

3. The kit of claim 2 wherein said post is porous coated to allow for bone ingrowth.

4. The kit of claim 3 wherein said porous coating includes osteoconductive or osteoinductive substances.

5. The kit of claim 1 wherein said fixation portion is a fin that is adapted to be fitted into the interior bone space of the posterior arch.

6. The kit of claim 5 wherein said fin is porous coated to allow for bone ingrowth.

7. The kit of claim 6 wherein said porous coating includes osteoconductive or osteoinductive substances.

8. The kit of claim 1 wherein said surface that articulates is comprised of one of a group consisting of a polymeric bearing material attached to a metal substrate, a ceramic bearing material, and metal bearing material.

9. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of at least a portion of the bone of a facet located on a mammalian vertebra, comprising:

a surface that articulates with another facet;

a bone contacting surface that contacts one of an exterior surface or a resected surface of said vertebra, said surface that articulates being connected to said bone contacting surface; and a fixation element that attaches said bone contacting surface to said vertebra;

and wherein said prosthesis is configured so that no portion of said prosthesis contacts the posterior arch of said vertebra ;

and wherein said artificial disc and said prosthesis are configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc, and the prosthesis.

10. The kit of claim 9 wherein said fixation element is a screw.

11. The kit of claim 9 wherein said bone contacting surface is porous coated to allow for bone ingrowth.

12. The kit of claim 9 wherein said surface that articulates is comprised of one of a group consisting of a polymeric bearing material attached to a metal substrate, a ceramic bearing material, and metal bearing material.

13. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of at least a portion of the bones of opposed and articulating facets located on a mammalian vertebra, where said facets are diseased or traumatized, comprising:

an inferior component adapted to be attached to a first vertebra and having a first fixation portion adapted to be implanted into a first interior bone space and a first articulation portion connected to said first fixation portion;

a superior component adapted to be attached to a second vertebra and having a second fixation portion adapted to be implanted into a second interior bone space and second articulation portion connected to said second fixation portion;

where the first vertebra is adjacent and superior to the second vertebra;

and wherein said artificial disc and said prosthesis are configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the first and second vertebrae, the artificial disc and the prosthesis.

14. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of at least a portion of the bones of opposed and articulating facets located on a mammalian vertebra, comprising:

an inferior component adapted to be attached to a first vertebra; and a superior component adapted to be attached to a second vertebra;

where the first vertebra is adjacent and superior to the second vertebra; and where one of said inferior and superior components includes:

a flange that connects to one of an exterior surface or a resected surface of said vertebra; and a fixation element that attaches said flange to said vertebra;

and further wherein said prosthesis is configured so that no portion of said prosthesis contacts the posterior arch of said vertebra ;

and wherein said artificial disc and said prosthesis are configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the first and second vertebrae, the artificial disc and the prosthesis.

15. The use of an artificial disc and a prosthetic facet for the replacement of a spine joint, comprising:

the replacement of an intervertebral disc with said artificial disc;

the resecting of at least a portion of the bone of a facet;

the attachment of said prosthetic facet to the remaining bone of said vertebra such that no portion of the prosthetic facet contacts the posterior arch of said vertebra;

where said prosthetic facet is adapted to articulate with another facet;

with the artificial disc and the prosthetic facet being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising said vertebra, said prosthetic facet and said artificial disc.

16. The use of an artificial disc, a first prosthetic facet and a second prosthetic facet for the replacement of a spine joint, comprising:

the replacement of an intervertebral disc with said artificial disc;

the resecting of at least a portion of the bone of a first facet on a first vertebra;

the attachment of said first prosthetic facet to the remaining bone of said first vertebra such that no portion of said prosthetic facet contacts the posterior arch of said vertebra;

the resecting of at least a portion of the bone of a second facet on a second vertebra; and the attachment of said second prosthetic facet to the remaining bone of said second vertebra such that no portion of said prosthetic facet contacts the posterior arch of said vertebra;

where said first prosthetic facet is adapted to articulate with said second prosthetic facet;

with the artificial disc and the prosthetic facet being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising said first and second vertebrae, said artificial disc and said first and second prosthetic facets.

17. A kit for spine joint replacement, comprising:
an artificial disc; and a prosthesis for the replacement of at least two facets located on a mammalian vertebra, comprising:
at least one bone contacting surface that is adapted to be secured to a surface of the vertebra; and at least two bearing surfaces for articulating with other facets, said at least two bearing surfaces being connected to said at least one bone contacting surface;

and wherein no portion of said prosthesis is supported by the lamina of the vertebra;

and wherein said artificial disc and said prosthesis are configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

18. The kit of claim 17 further comprising fixation elements for securing said at least one bone contacting surface to the vertebra.

19. The kit of claim 18 wherein said fixation elements are screws.

20. The kit of claim 17 wherein said at least one bone contacting surface is porous coated to allow for bone ingrowth.

21. The kit of claim 20 wherein said porous coating includes at least one from a group comprising osteoinductive and osteoconductive substances.

22. The kit of claim 17 wherein said bearing surfaces are formed from a material selected from the group consisting of a ceramic, a metal and a polymer.

23. The kit of claim 17 wherein said prosthesis is configured so that said at least two bearing surfaces are adapted to replace a pair of inferior facets.

24. The kit of claim 17 wherein said prosthesis is configured so that said at least two bearing surfaces are adapted to replace a pair of superior facets.

25. The kit of claim 17 wherein said prosthesis is configured so that said at least two bearing surfaces are adapted to replace an inferior facet and a superior facet.

26. The kit of claim 17 wherein said prosthesis is configured so that said at least two bearing surfaces are adapted to replace a pair of inferior facets and a pair of superior facets.

27. The use of an artificial disc and a prosthesis for the replacement of a spine joint, comprising:

the replacement of an intervertebral disc with the artificial disc;

the resecting of a pair of facets on the vertebra;
and the attachment of the prosthesis to the vertebra so that a pair of bearing surfaces on the prosthesis are positioned in place of the resected facets, wherein the prosthesis is configured so that no portion of said prosthesis is supported by the lamina of the vertebra;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

28. The use of an artificial disc, a first prosthesis and a second prosthesis for the replacement of a spine joint, comprising:

the replacement of an intervertebral disc with the artificial disc;

the resecting of at least a bony portion of the inferior facets of a superior vertebra;

the attachment of the first prosthesis that replaces said inferior facets of said superior vertebra;
the resecting of at least a bony portion of the superior facets of an inferior vertebra; and the attachment of the second prosthesis that replaces said superior facets of said inferior vertebra;
wherein no portion of the first prosthesis is supported by the lamina of said superior vertebra, and further wherein no portion of the second prosthesis is supported by the lamina of said inferior vertebra ;
with the artificial disc and the first prosthesis and the second prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the superior and inferior vertebrae, the artificial disc and the first and second prostheses.

29. The use of an artificial disc, a first prosthesis and a second prosthesis for the replacement of a spine joint, comprising:

the replacement of an intervertebral disc with the artificial disc;

the resecting of at least a bony portion of te inferior facets of a most superior vertebra;

the attachment of the first prosthesis that replaces said inferior facets of said most superior vertebra;

the resecting of at least a bony portion of the superior facets of a most inferior vertebra;

the attachment of the second prosthesis that replaces said superior facets of said most inferior vertebra;

the resecting of at least a bony portion of all of the facets of at least one intermediate vertebra located between said most superior vertebra and said most inferior vertebra;

wherein, for each of said at least one intermediate vertebra, a prosthesis is attached that replaces all facets of said intermediate vertebra;

with the artificial disc and the prostheses being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the intermediate vertebra, the artificial disc, and the prosthesis attached to replace all facets of the intermediate vertebra.

30. A spinal implant kit comprising:
an artificial disc; and one facet prosthesis adapted to replace two superior facets of an inferior vertebra;

one facet prosthesis adapted to replace two inferior facets of a superior vertebra; and one facet prosthesis adapted to replace two superior facets and two inferior facets of an intermediate vertebra;

with the artificial disc and the prostheses being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the intermediate vertebra, the artificial disc and the prosthesis.

31. A kit for spine joint replacement comprising:

an artificial disc; and a prosthesis for the replacement of a pair of spinal facets, said prosthesis comprising:

a first vertical member having a first end and a second end, said first end being adapted for disposition against, and attachment to, a first pedicle of a vertebra, and said second end comprising a bearing surface for engagement with a facet of an adjacent vertebra;

a second vertical member having a first end and a second end, said first end being adapted for disposition against, and attachment to, the other pedicle of the vertebra, said second end comprising a bearing surface with a facet of an adjacent vertebra;

and a bridge connecting said second end of said first vertical member to said second end of said second vertical member;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artifical disc and the prosthesis.

32. The kit of claim 31 wherein said first vertical member, said second vertical member and said bridge are formed so that said prosthesis is displaced from the lamina of the vertebra when said first end of said first vertical member is disposed against, and attached to, the first pedicle of a vertebra and said first end of said second vertical member is disposed against, and attached to, the other pedicle of the vertebra.

33. A spinal implant kit comprising:
an artificial disc; and a superior facet prosthesis adapted to replace two superior facets of an inferior vertebra;

an inferior facet prosthesis adapted to replace two inferior facets of a superior vertebra;

wherein no portion of said superior facet prostheses is supported by a lamina of a vertebra; and wherein no portion of said inferior facet prostheses is supported by a lamina of a vertebra;
with the artificial disc and the prostheses being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the inferior and superior vertebrae, the artificial disc and the prostheses.

34. A kit for spine joint replacement comprising:

an artificial disc; and a prosthesis for the replacement of a pair of spinal facets, said prosthesis comprising:

a first vertical member having a first end and a second end, said first end being adapted for disposition against, and attachment to, a first pedicle of a vertebra, and said second end comprising a bearing surface for engagement with a facet of an adjacent vertebra;

a second vertical member having a first end and a second end, said first end being adapted for disposition against, and attachment to, the other pedicle of the vertebra, said second end comprising a bearing surface with a facet of an adjacent vertebra; and a bridge connecting said first vertical member to said second vertical member;

wherein said first vertical member, said second vertical member and said bridge are formed so that said prostheses is displaced from the lamina of the vertebra when said first end of said first vertical member is disposed against, and attached to, the first pedicle of a vertebra and said first end of said second vertical member is disposed against, and attached to, the other pedicle of the vertebra;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

35. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic mounts;

a prosthetic lamina extending from said two prosthetic mounts;

a pair of prosthetic superior facets extending from said two prosthetic mounts and said prosthetic lamina;

a pair of prosthetic inferior facets extending from said prosthetic lamina;

a prosthetic spinous process extending from said prosthetic lamina; and a pair of prosthetic transverse processes extending from said two prosthetic mounts;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

36. The kit of claim 35 wherein at least one of said prosthetic spinous process and said two prosthetic transverse processes includes at least one opening for attaching soft tissue to said prosthesis.

37. The kit of claim 35 wherein said two prosthetic mounts comprise openings for attaching said prosthesis to the natural vertebra.

38. A kit for spine joint replacement comprising:

an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic mounts;

a prosthetic lamina extending from said two prosthetic mounts;

a pair of prosthetic superior facets extending from said two prosthetic mounts and said prosthetic lamina ;
a pair of prosthetic inferior facets extending from said prosthetic lamina; and a prosthetic spinous process extending from said prosthetic lamina;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

39. The kit of claim 38 wherein said prosthetic spinous process includes at least one opening for attaching soft tissue to said prosthesis.

40. The kit of claim 38 wherein said two prosthetic mounts comprise openings for attaching said prosthesis to the natural vertebra.

41. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic mounts;

a prosthetic lamina extending from said two prosthetic mounts;

a pair of prosthetic superior facets extending from said two prosthetic mounts and said prosthetic lamina;

a pair of prosthetic inferior facets extending from said prosthetic lamina; and a pair of prosthetic transverse processes extending from said two prosthetic mounts;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

42. The kit of claim 41 wherein at least one of said two prosthetic transverse processes includes at least one opening for attaching soft tissue to said prosthesis.

43. The kit of claim 41 wherein said two prosthetic mounts comprise openings for attaching said prosthesis to the natural vertebra.

44. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic mounts;

a prosthetic lamina extending from said two prosthetic mounts;

a pair of prosthetic superior facets extending from said two prosthetic mounts and said prosthetic lamina;
and a pair of prosthetic inferior facets extending from said prosthetic lamina;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

45. The kit of claim 44 wherein said two prosthetic mounts comprise openings for attaching said prosthesis to the natural vertebra.

46. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic pedicles;

a prosthetic lamina extending from said two prosthetic pedicles;

a pair of prosthetic superior facets extending from said two prosthetic pedicles and said prosthetic lamina;
a pair of prosthetic inferior facets extending from said prosthetic lamina;

a prosthetic spinous process extending from said prosthetic lamina; and a pair of prosthetic transverse processes extending from said two prosthetic pedicles;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

47. The kit of claim 46 wherein at least one of said prosthetic spinous process and said two prosthetic transverse processes includes at least one opening for attaching soft tissue to said prosthesis.

48. The kit of claim 46 wherein said two prosthetic pedicles comprise openings for attaching said prosthesis to the natural vertebra.

49. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic pedicles;

a prosthetic lamina extending from said two prosthetic pedicles;

a pair of prosthetic superior facets extending from said two prosthetic pedicles and said prosthetic lamina;
a pair of prosthetic inferior facets extending from said prosthetic lamina; and a prosthetic spinous process extending from said prosthetic lamina;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

50. The kit of claim 49 wherein said prosthetic spinous process includes at least one opening for attaching soft tissue to said prosthesis.

51. The kit of claim 49 wherein said two prosthetic pedicles comprise openings for attaching said prosthesis to the natural vertebra.

52. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic pedicles;

a prosthetic lamina extending from said two prosthetic pedicles;

a pair of prosthetic superior facets extending from said two prosthetic pedicles and said prosthetic lamina;
a pair of prosthetic inferior facets extending from said prosthetic lamina; and a pair of prosthetic transverse processes extending from said two prosthetic pedicles;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

53. The kit of claim 52 wherein at least one of said two prosthetic transverse processes includes at least one opening for attaching soft tissue to said prosthesis.

54. The kit of claim 52 wherein said two prosthetic pedicles comprise openings for attaching said prosthesis to the natural vertebra.

55. A kit for spine joint replacement comprising:
an artificial disc; and a prosthesis for the replacement of a posterior element of a natural vertebra, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said prosthesis comprising:

a pair of prosthetic pedicles;

a prosthetic lamina extending from said two prosthetic pedicles;

a pair of prosthetic superior facets extending from said two prosthetic pedicles and said prosthetic lamina;
and a pair of prosthetic inferior facets extending from said prosthetic lamina;

with the artificial disc and the prosthesis being configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the vertebra, the artificial disc and the prosthesis.

56. The kit of claim 55 wherein said two prosthetic pedicles comprise openings for attaching said prosthesis to the natural vertebra.

57. The use of an artificial disc and a prosthesis for the replacement of a spine joint, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the two natural pedicles, said use comprising:

the replacement of an intervertebral disc with the artificial disc;

the making of a resection at the most dorsal of aspect of the two natural pedicles; and the attachment of the prosthesis to the resected vertebra, the prosthesis comprising a pair of prosthetic mounts, a prosthetic lamina extending from said two prosthetic mounts, a pair of prosthetic superior facets extending from said two prosthetic mounts and said prosthetic lamina, and a pair of prosthetic inferior facets extending from said prosthetic lamina;

with the artificial disc and the prosthesis configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the natural vertebra, the artificial disc, and the prosthesis.

58. A use according to claim 57 wherein said prosthesis further comprises a prosthetic spinous process extending from said prosthetic lamina.

59. A use according to claim 57 wherein said prosthesis further comprises a pair of prosthetic transverse processes extending from said two prosthetic mounts.

60. A use according to claim 57 wherein said prosthesis further comprises a prosthetic spinous process extending from said prosthetic lamina and a pair of prosthetic transverse processes extending from said two prosthetic mounts and said prosthetic lamina.

61. The use of an artificial disc and a prosthesis for the replacement of a spine jont, wherein the natural vertebra comprises a natural vertebral body, a pair of natural pedicles extending from the natural vertebral body, a natural lamina extending from the two natural pedicles, a pair of natural superior facets extending from the two natural pedicles and the natural lamina, a pair of natural inferior facets extending from the natural lamina, a natural spinous process extending from the natural lamina, and a pair of natural transverse processes extending from the natural pedicles, said use comprising:

the replacement of an intervertebral disc with the artificial disc;

the making of a resection at the junction of the natural vertebral body and the two natural pedicles; and the attachment a prosthesis to the resected vertebra, the prosthesis comprising a pair of prosthetic pedicles, a prosthetic lamina extending from said prosthetic pedicles, a pair of prosthetic superior facets extending from said two prosthetic pedicles and said prosthetic lamina, and a pair of prosthetic inferior facets extending from said prosthetic lamina;

with the artificial disc and the prosthesis configured for complementary interoperation to restore the natural biomechanics of a spinal motion segment comprising the natural vertebra, the artificial disc and the prosthesis.

62. A use according to claim 61 wherein said prosthesis further comprises a prosthetic spinous process extending from said prosthetic lamina.

63. A use according to claim 61 wherein said prosthesis further comprises a pair of prosthetic transverse processes extending from said two prosthetic pedicles.

64. A use according to claim 61 wherein said prosthesis further comprises a prosthetic spinous process extending from said prosthetic lamina and two prosthetic transverse processes extending from said two prosthetic pedicles and said prosthetic lamina.

65. A spinal joint kit for replacement of a portion of a mammalian spine comprising a spinal motion segment comprising a vertebra, the kit comprising:
an artificial disc adapted to be incorporated into the spinal motion segment; and a prosthesis comprising a pair of articular surfaces formed separately from each other, wherein the pair of articular surfaces is selected from the group consisting of a pair of prosthetic superior facets and a pair of prosthetic inferior facets;
wherein the artificial disc and the prosthesis are configured for complementary interoperation to help restore the natural biomechanics of the spinal motion segment.

66. The kit of claim 65, wherein the prosthesis is adapted to be secured to the vertebra without requiring removal of substantially all of a lamina of the vertebra.

67. The kit of claim 65, wherein the prosthesis further comprises a bone contacting surface, the kit further comprising a fixation member configured to urge the prosthesis against the vertebra such that the bone contacting surface abuts the vertebra.

68. The kit of claim 65, wherein each articular surface of the pair of articular surfaces is shaped to mimic the position and shape of the corresponding natural articular surface such that the prosthesis operates as part of a partially or fully prosthetic facet joint to mimic the articulation present in a natural facet joint.

69. The kit of claim 65, wherein the artificial disc and the prosthesis are configured to function independently of any extra-discal damping member.

70. A spinal joint kit for replacement of a portion of a mammalian spine comprising a spinal motion segment comprising a vertebra, the kit comprising:
an artificial disc adapted to be incorporated into the spinal motion segment; and a prosthesis comprising a pair of prosthetic inferior facets adapted to be secured to the vertebra without requiring removal of substantially all of a lamina of the vertebra;
wherein the artificial disc and the prosthesis are configured for complementary interoperation to help restore the natural biomechanics of the spinal motion segment.

71. The kit of claim 70, wherein the prosthesis further comprises a bone contacting surface, the kit further comprising a fixation member configured to urge the prosthesis against the vertebra such that the bone contacting surface abuts the vertebra.

72. The kit of claim 70, wherein the pair of prosthetic inferior facets comprises a pair of articular surfaces, wherein the pair of articular surfaces is shaped to mimic the shape of a pair of natural inferior articular surfaces such that the prosthesis operates as part of a partially or fully prosthetic facet joint to mimic the articulation present in a natural facet joint.

73. The kit of claim 70, wherein the artificial disc and the prosthesis are configured to function independently of any extra-discal damping member.

74. A spinal joint kit for replacement of a portion of a mammalian spine comprising a spinal motion segment comprising a vertebra, the kit comprising:
an artificial disc adapted to be incorporated into the spinal motion segment; and a prosthesis comprising at least one prosthetic facet, the prosthesis comprising a bone contacting surface; and a fixation member configured to urge the prosthesis against the vertebra such that the bone contacting surface abuts the vertebra;
wherein the artificial disc and the prosthesis are configured for complementary interoperation to help restore the natural biomechanics of the spinal motion segment.

75. The kit of claim 74, wherein the prosthetic facet further comprises an articular surface, wherein the articular surface is shaped to mimic the shape of a natural articular surface on a natural facet such that the prosthesis operates as part of a partially or fully prosthetic facet joint to mimic the articulation present in a natural facet joint.

76. The kit of claim 74, wherein the artificial disc and the prosthesis are configured to function independently of any extra-discal damping member.

77. The use of an artificial disc and a prosthesis for the replacement of a portion of a mammalian spine comprising a spinal motion segment comprising a vertebra, the use comprising:
the implantation of the artificial disc adjacent to the vertebra; and the securing of the prosthesis to the vertebra such that the prosthesis complements the artificial disc to help restore the natural biomechanics of the spinal motion segment, the prosthesis comprising a pair of articular surfaces formed separately from each other, wherein the pair of articular surfaces is selected from the group consisting of a pair of prosthetic superior facets and a pair of prosthetic inferior facets.

78. The use of claim 77, wherein the prosthesis is adapted to be secured to the vertebra without requiring removal of substantially all of a lamina of the vertebra.

79. The use of claim 77, wherein the prosthesis further comprises a bone contacting surface, wherein securing the prosthesis to the vertebra comprises securing the prosthesis against the vertebra such that the bone contacting surface abuts the vertebra.

80. The use of claim 77, wherein the pair of articular surfaces is shaped to mimic the shape of a pair of natural articular surfaces such that the prosthesis operates as part of a partially or fully prosthetic facet joint to mimic the articulation present in a natural facet joint.

81. The use of claim 77, wherein the artificial disc and the prosthesis are configured to function independently of any extra-discal damping member.

82. The use of an artificial disc and a prosthesis for the replacement of a portion of a mammalian spine comprising a spinal motion segment comprising a vertebra, the use comprising:
the implantation of the artificial disc adjacent to the vertebra; and the securing of the prosthesis to the vertebra such that the prosthesis complements the artificial disc to help restore the natural biomechanics of the spinal motion segment without removal of substantially all of a lamina of the vertebra, the prosthesis comprising a pair of prosthetic inferior facets.

83. The use of claim 82, wherein the prosthesis further comprises a bone contacting surface, wherein securing the prosthesis to the vertebra comprises securing the prosthesis against the vertebra such that the bone contacting surface abuts the vertebra.

84. The use of claim 82, wherein the pair of prosthetic inferior facets comprises a pair of articular surfaces, wherein the pair of articular surfaces is shaped to mimic the shape of a pair of natural articular surfaces such that the prosthesis operates as part of a partially or fully prosthetic facet joint to mimic the articulation present in a natural facet joint.

85. The use of claim 82, wherein the artificial disc and the prosthesis are configured to function independently of any extra-discal damping member.