US20110307071A1 - Joint Prosthesis with Positionable Head - Google Patents
Joint Prosthesis with Positionable Head Download PDFInfo
- Publication number
- US20110307071A1 US20110307071A1 US13/214,630 US201113214630A US2011307071A1 US 20110307071 A1 US20110307071 A1 US 20110307071A1 US 201113214630 A US201113214630 A US 201113214630A US 2011307071 A1 US2011307071 A1 US 2011307071A1
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- United States
- Prior art keywords
- coupling portion
- insert
- stem
- coupling
- coupler
- Prior art date
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- Abandoned
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-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4612—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of shoulders
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
- A61F2002/30339—Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
- A61F2002/30616—Sets comprising a plurality of prosthetic parts of different sizes or orientations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/40—Joints for shoulders
- A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
- A61F2002/4037—Connections of heads to necks
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present disclosure relates to joint prostheses, and particularly to prostheses having articulating head components. More specifically, the disclosure relates to a system for achieving variable positions for the head component of a joint prosthesis relative to a bone-engaging portion of the prosthesis.
- a trial component is used to determine the optimum component configuration for the permanent prosthetic device.
- the surgeon is able to make a selection of components and configurations that fits the joint in an acceptable manner.
- the functionality of the fit cannot be fully assessed until the surgery is completed and the patient has had an opportunity to utilize the repaired joint.
- a revision surgery is necessary to replace a prosthetic device that is not optimally sized or configured for the particular patient.
- One type of revision surgery requires removal of the entire prosthesis from the bone and replacement with a different prosthesis.
- a prosthesis assembly includes a stem configured to be implanted in a bone and including a first coupling portion, a head having a bearing surface configured to mate with at least one of a natural opposing joint component and a prosthetic opposing joint component, the head further having a second coupling portion, a coupler including a third coupling portion and a fourth coupling portion, the third coupling portion configured to couple with the second coupling portion, and an insert including (i) a fifth coupling portion configured to couple with the fourth coupling portion in any of a plurality of rotational orientations in combination with any of a plurality of roll angles and any of a plurality of pitch angles, and (ii) a sixth coupling portion configured to couple with the first coupling portion only when the insert assumes a predetermined rotational orientation with respect to the stem.
- a prosthesis assembly kit includes at least one stem configured to be implanted in a bone, the at least one stem including a keyed stem coupling portion, a plurality of heads, each of the plurality of heads having a bearing surface configured to mate with at least one of a natural opposing joint component and a prosthetic opposing joint component, each of the plurality of heads further having a head coupling portion, at least one first coupler including an upper coupling portion and a lower coupling portion, the upper coupling portion configured to couple with the head coupling portion of each of the plurality of heads, and at least one insert including (i) a non-keyed insert coupling portion configured to couple with the lower coupling portion of each of the at least one first couplers in any of a plurality of rotational orientations in combination with any of a plurality of roll angles and any of a plurality of pitch angles, and (ii) a keyed insert coupling portion configured to couple with the keyed stem coupling portion of each of the at least
- a method of forming a prosthesis includes implanting a stem in a bone, the stem including a first coupling portion, determining a desired orientation of a head with respect to the stem, coupling the head with a first coupling portion of a coupler, coupling a second coupling portion of the coupler with an insert, aligning a key member of the coupled insert with the implanted stem, and coupling the aligned insert with the implanted stem.
- FIG. 1 depicts a perspective exploded view of a prosthesis assembly including a stem, an insert, a coupler and a head incorporating principles of the invention
- FIG. 2 depicts a side plan view of the stem of FIG. 1 ;
- FIG. 3 depicts a partial cross sectional view of the stem of FIG. 1 showing a coupling receptacle with a key feature
- FIG. 4 depicts a partial top plan view of the stem of FIG. 1 showing the coupling receptacle with the key feature;
- FIG. 5 depicts a cross sectional view of the insert of FIG. 1 showing an inner coupling receptacle and an outer coupling wall with a key feature;
- FIG. 6 depicts a bottom plan view of the insert of FIG. 5 showing the periphery of the outer coupling wall and the key feature;
- FIG. 7 depicts a cross sectional view of the coupler of FIG. 1 showing an upper coupling wall and an lower bulbous coupling;
- FIG. 8 depicts a bottom plan view of the coupler of FIG. 7 showing the bulbous coupling to be circular in plan view;
- FIG. 9 depicts a cross sectional view of the head of FIG. 1 showing an upper articulating surface and a lower surface including a coupling receptacle and a recessed area;
- FIGS. 10-13 depict a procedure of coupling of the head of FIG. 1 with the coupler of FIG. 1 and coupling the coupler of FIG. 1 with the insert of FIG. 1 which may be accomplished prior to implantation in accordance with principles of the invention;
- FIGS. 14-15 depict a procedure of alignment the key member of the insert of FIG. 1 with the key member of the stem of FIG. 1 and coupling of the insert with the stem;
- FIGS. 16-19 depict the combinations of version and inclination angles at which the coupler of FIG. 1 may be coupled with the insert of FIG. 1 ;
- FIG. 20 depicts a perspective view of a removal tool that may be included in a kit and used to decouple the head of FIG. 1 from the coupler of FIG. 1 ;
- FIG. 21 depicts a partial cross sectional view of the assembled prosthesis assembly of FIG. 1 showing a gap into which the prongs of the removal tool of FIG. 20 may be inserted to decouple the head of FIG. 1 from the coupler of FIG. 1 ;
- FIG. 22 depicts a partial cross sectional view of the assembled prosthesis assembly of FIG. 1 showing a gap into which the prongs of the removal tool of FIG. 20 may be inserted to decouple the head of FIG. 1 from the coupler of FIG. 1 when the axis of the head is not aligned with the axis of the stem receptacle;
- FIG. 23 depicts a perspective view of the removal tool of FIG. 20 positioned to decouple the head of FIG. 1 from the coupler of FIG. 1 ;
- FIG. 24 depicts a partial cross sectional view of the assembled prosthesis assembly of FIG. 1 with the end portions of the prongs of the removal tool of FIG. 20 inserted in the gap between the head and the stem;
- FIG. 25 depicts a partial cross sectional view of the assembled coupler and insert of FIG. 1 with portions of the prongs of the removal tool of FIG. 20 inserted between the stem and the shoulder portion of the coupler for decoupling of the coupler and the insert;
- FIG. 26 depicts a partial cross sectional view of the insert and stem of FIG. 1 with a threaded decoupler partially threaded into the threaded bore of the insert for decoupling of the insert and the stem;
- FIG. 27 depicts a side plan view of an alternative insert that may be used to couple the head of FIG. 1 with the stem of FIG. 1 with the axis of the head parallel to the axis of the stem receptacle;
- FIG. 28 depicts a partial cross sectional view of the alternative coupler of FIG. 27 ;
- FIG. 29 depicts a partial cross sectional view of the stem and head of FIG. 1 assembled using the coupler of FIG. 27 ;
- FIG. 30 depicts a perspective view of a removal tool that may be included in a kit and used to decouple the coupler of FIG. 1 from the insert of FIG. 1 or that insert of FIG. 27 ;
- FIG. 31 depicts a side plan view of a decoupler with a threaded stem and a flange that may be included in a kit and used to decouple the coupler of FIG. 1 from the insert of FIG. 1 or the insert of FIG. 27 ;
- FIG. 32 depicts a partial cross sectional view of the insert and stem of FIG. 1 with the decoupler of FIG. 31 threaded into the threaded bore of the insert for decoupling of the insert and the stem;
- FIG. 33 depicts a partial cross sectional view of the insert of FIG. 27 and the stem of FIG. 1 with the decoupler of FIG. 31 threaded into the threaded bore of the insert for decoupling of the insert and the stem.
- FIG. 1 depicts a perspective view of a humeral prosthesis assembly 100 .
- the assembly 100 is the humeral component of a shoulder prosthesis that can be implanted in the humerus bone of a patient for articulating engagement with the natural glenoid or with a glenoid prosthesis.
- the assembly 100 includes a stem 102 configured to be implanted within the humerus bone in an acceptable manner.
- the assembly 100 further includes an insert 104 , a coupler 106 and an articulating head component 108 .
- the stem 102 includes a shaft 110 and a platform area 112 .
- the platform area 112 includes an upper surface 114 that faces toward the glenoid component of the joint when the stem 102 is implanted within a patient.
- the upper surface 114 defines a tapered bore 116 that includes a key member 118 .
- the insert 104 shown in FIGS. 1 , 5 , and 6 , includes an outer wall 120 which generally tapers from an upper portion 122 to a lower portion 124 .
- a tapered bore 126 opens to the upper portion 122 and a threaded bore 128 opens at one end to the lower portion 124 and opens at the other end to the tapered bore 126 .
- a key member 130 is located near the lower portion 124 .
- the coupler 106 includes an upper coupling portion 132 and a lower coupling portion 134 joined by a middle portion 136 as shown in FIGS. 7 and 8 .
- the upper coupling portion 132 includes a bore 138 and a tapered outer wall 140 .
- the middle portion 136 includes a shoulder portion 142 which tapers inwardly from the tapered outer wall 140 to a neck portion 144 .
- the lower coupling portion 134 is bulbous shaped when viewed in profile ( FIG. 7 ) and circular when viewed in plan (see FIG. 8 ).
- the articulating head component 108 includes an outer articulating surface 148 , which is shaped to articulate with a glenoid component, and a lower surface 150 .
- the lower surface 150 includes a protuberance 152 defining a tapered bore 154 .
- a recessed area 156 extends between the protuberance 152 and a lip 158 which circumscribes the lower surface 150 .
- Assembly of the humeral prosthesis assembly 100 in one embodiment may be performed once the stem 102 has been implanted within the bone of a patient.
- a trial (not shown) is used to determine the head size and the version and inclination angle combination of the head that provides the desired joint configuration.
- the coupler 106 may then be joined with the articulating head component 108 of the desired size by aligning the tapered bore 154 with the upper coupling portion 132 as shown in FIG. 10 .
- the tapered bore 154 and the outer wall 140 of the upper coupling portion 132 in this embodiment have a five degree taper.
- the tapered bore 154 and the outer wall 140 thus provide for a Morse taper coupling. Accordingly, movement of the articulating head component 108 in the direction of the arrow 160 onto the upper coupling portion 132 provides the configuration of FIG. 11 .
- the articulating head component 108 and the coupler 106 are then firmly coupled by impacting the articulating head component 108 onto the coupler 106 .
- the lower coupling portion 134 of the coupler 106 is then aligned with the tapered bore 126 of the insert 104 and the articulating head component 108 and the coupler 106 are moved in the direction of the arrow 162 . Insertion and impacting of the lower coupling portion 134 within the tapered bore 126 results in the configuration of FIG. 13 .
- the lower coupling portion 134 has a diameter that is larger than the diameter of the tapered bore 126 at a location spaced apart from the upper portion 122 of the insert 104 .
- the lower coupling portion 134 may be firmly secured within the tapered bore 126 by application of sufficient force.
- the force used to secure the lower coupling portion 134 within the tapered bore 126 is greater than the force used when forming a Morse taper coupling.
- the lower portion 124 of the insert 104 is aligned with the tapered bore 116 as shown in FIG. 14 .
- the key member 130 and the key member 118 are configured such that the lower portion 124 may be fully inserted into the tapered bore 116 in a single rotational configuration. Accordingly, the insert 104 must be rotated as necessary to align the key member 130 and the key member 118 . Consequently, the axis of the bore 116 is collocated with the axis of the insert 104 .
- the tapered bore 116 and the outer wall 120 of the insert 104 in this embodiment have a ten degree taper.
- the tapered bore 116 and the outer wall 120 thus provide for a Morse taper coupling. Accordingly, movement of the insert 104 in the direction of the arrow 164 into the tapered bore 116 provides the configuration of FIG. 15 .
- the insert 104 and the stem 102 are then firmly coupled by impacting the articulating head component 108 to force the articulating head component 108 , the coupler 106 and the insert 104 toward the stem 102 .
- the coupler 106 and the insert 104 may be positioned with the implanted stem 102 prior to coupling the head 108 with the coupler 106 .
- the head 108 is then positioned and coupled with the previously positioned coupler 106 and the insert 104 .
- This alternative may be used in rescission surgeries to allow for a smaller incision to be used to access the surgical site.
- FIG. 15 depicts a configuration wherein the axes of the tapered bore 154 of the articulating head component 108 , the coupler 106 , the insert 104 and the tapered bore 116 are substantially aligned. Because the articulating head component 108 and the coupler 106 form a Morse taper coupling as discussed above, the articulating head component 108 will assume a specific axial alignment with respect to the coupler 106 when the articulating head component 108 is coupled with the coupler 106 . Likewise, because the insert 104 and the stem 102 form a Morse taper coupling as discussed above, the insert 104 will assume a specific axial alignment with respect to the stem 102 when the insert 104 is coupled with the stem 102 .
- the axial alignment of the articulating head component 108 with respect to the stem 102 may be established by controlling the axial alignment of the coupler 106 with the insert 104 .
- the key members 118 and 130 establish a specific rotational alignment of the insert 104 with respect to the stem 102 . Therefore, the rotational orientation of the articulating head component 108 with respect to the stem 102 may be established by controlling the rotational alignment of the coupler 106 with the insert 104 .
- the desired axial and rotational alignment of the articulating head component 108 with respect to the stem 102 may be established by controlling the rotational and axial alignment of the coupler 106 with the insert 104 .
- FIG. 16 depicts the geometric center 170 of the lower coupling portion 134 .
- the lower coupling portion 134 is formed such that the diameter of the lower coupling portion 134 along a plane that includes the geometric center 170 and is located between the axes 172 and 174 is greater than a diameter of the tapered bore 126 at a location between the upper portion 122 of the insert 104 and the bottom of the tapered bore 126 .
- the coupler 106 may be coupled with the insert 104 with any axial or rotational alignment so long as the lower coupling portion 134 is oriented within the tapered bore 126 such that a plane that includes the geometric center 170 , and is perpendicular to the axis 176 of the insert 104 , is located between the axes 172 and 174 .
- the axis 180 of the coupler 106 is aligned with the axis 170 (the axis 180 is depicted as offset from the axis 170 in FIG. 16 for purpose of clarity).
- the plane 182 which includes the geometric center 170 , is perpendicular to the axis 176 of the insert 104 and is located between the axes 172 and 174 . Accordingly, the coupler 106 and the insert 104 may be coupled in the configuration shown in FIG. 16 .
- FIG. 17 shows the coupler 106 pivoted in a direction away form the key member 130 , thereby generating an angle a between the axis 180 and the axis 170 .
- the plane 182 which includes the geometric center 170 and is perpendicular to the axis 176 of the insert 104 , is still located between the axes 172 and 174 .
- the coupler 106 and the insert 104 may be coupled in the configuration shown in FIG. 17 .
- the coupler 106 and the insert 104 may be coupled in the configuration shown in FIG. 18 wherein the coupler 106 is pivoted in a direction toward the key member 130 , thereby generating an angle a between the axis 180 and the axis 170 .
- the coupler 106 may be pivoted from side to side with respect to the key member 130 .
- the coupler 106 and the insert 104 may coupled in any desired combination of inclination and version angles that positions the axis 180 of the coupler 106 within a cone 184 originating from the axis 170 and having a cone angle of ⁇ .
- the coupler 106 may be positioned within about 15 degrees of the axis 180 in any direction, thereby providing a cone angle of about 30 degrees.
- the cone angle for a particular embodiment is typically limited by impingement of either the insert 104 on the shoulder 142 or impingement of the stem 102 on the lower surface 150 . Accordingly, the cone angle may be modified by selection of the shape and dimensions of, for example, the neck 144 and shoulder 142 of the coupler 106 , the protuberance 152 , the recessed area 156 and the platform 112 .
- the removal tool 200 includes a base 202 and a shaft 204 .
- Two prongs 206 and 208 extend outwardly from the base 202 and an impact knob 210 is located on the shaft 204 .
- the prongs 206 and 208 are spaced apart by a distance corresponding to the diameter of the tapered bore 116 and are narrowed at the distal end portions 212 and 214 , respectively.
- the distal end portions 212 and 214 are thus proportioned to fit within a gap 220 (see FIG. 21 ) between the protuberance 152 and the upper surface 114 of the shaft 102 . Even when the articulating head component 108 is angled with respect to the shaft 102 as shown in FIG. 22 , the gap 220 is present.
- disassembly of the assembly 100 is accomplished by maneuvering the prongs 206 and 208 between the articulating head component 108 and the upper surface 114 of the stem 102 as shown in FIG. 23 .
- the recessed area 156 facilitates the positioning of the distal end portions 212 and 214 of the prongs 206 and 208 between the protuberance 152 and the upper surface 114 of the shaft 102 as shown in FIG. 24 .
- the impact knob 210 is impacted.
- the force of the impact is transferred through the inclined surfaces of the tapered prongs 206 and 208 to the protuberance 152 forcing the articulating head component 108 away from the stem 102 .
- the impact will typically break the coupling between the outer wall 140 of the coupler 106 and the tapered bore 154 , allowing the articulating head 108 to be removed from the coupler 106 .
- the distance between the prongs 206 and 208 decreases from the distance at the distal end portions 212 and 214 and the distance at the base 202 . Specifically, the distance between the prongs 206 and 208 at a location between the distal end portions 212 and 214 and the base 202 corresponds to the diameter of the neck 144 . Accordingly, once the articulating head component 108 is removed, the prongs 206 and 208 are positioned adjacent to the neck 144 as shown in FIG. 25 . The prongs 206 and 208 thus contact the shoulder portion 142 of the coupler 106 . If desired, the upper inner surface of the prongs 206 and 208 may be formed with an angle complimentary to the angle of the shoulder portion 142 as shown in FIG. 25 . A subsequent impact on the impact knob 210 decouples the coupler 106 from the insert 104 .
- the insert 104 is removed by insertion of a threaded decoupler 220 into the threaded bore 128 as shown in FIG. 26 .
- the threaded decoupler 220 contacts the bottom of the tapered bore 116 . Additional rotation of the threaded decoupler 220 breaks the coupling between the insert 104 and the tapered bore 116 .
- a new humeral prosthetic assembly may then be assembled using the stem 102 along with a new insert 104 , a new coupler 106 , and a new articulating head component 108 .
- the orientation of the new articulating head component 108 may be set in the manner described above. Instrumentation which may be used to couple the articulating head component 108 and the coupler 106 at the desired orientation with the insert 104 is described in U.S. Publication No. 2005/0288681, published on Dec. 29, 2005, which is herein incorporated by reference.
- the impact force used to form the Morse taper coupling between the insert 104 and the stem 102 is passed through the coupler 106 . Because the axis of the coupler 106 may not be aligned with the axis 176 of the insert 104 , forming the Morse taper coupling applies a torque to the coupler 106 tending to change the alignment of the coupler 106 . Since the insert 104 and the coupler 106 may be coupled using a force higher than the force used to form a Morse taper coupling, however, passing the force necessary to couple the insert 104 to the stem 102 through the coupler 106 does not significantly change the alignment of the coupler 106 within the tapered bore 126 .
- the coupler 106 and insert 104 need not be used. Rather, the insert 230 shown in FIGS. 27 and 28 may be used.
- the insert 230 includes an upper tapered wall portion 232 and a lower tapered wall portion 234 .
- a bore 236 extends from the upper surface 238 of the insert 230 to a threaded bore 240 .
- the upper tapered wall portion 232 is configured with a taper that provides a Morse taper coupling with the tapered bore 154 while the lower tapered wall portion 234 is configured with a taper that provides a Morse taper coupling with the tapered bore 116 .
- the insert 230 may thus be used to couple the articulating head component 108 with the stem 102 as shown in FIG. 28 wherein the insert 230 is coupled with the tapered bore 116 at a location above the key member 128 .
- the humeral prosthesis assembly 100 is thus a modular system that can be used to provide a number of different orientations of an articulating head component with respect to a stem. Accordingly, a kit including stems 102 of different lengths, at least one insert 104 , at least one coupler 106 , at least one insert 230 , and a removal tool 200 provides a highly adaptable system that can accommodate a wide range of joint constructs.
- a removal tool 250 shown in FIG. 30 may be used to decouple the insert 104 and the insert 230 from the stem 102 .
- the removal tool 250 includes a base 252 and a shaft 254 .
- Two prongs 256 and 258 extend outwardly from the base 252 and an impact knob 260 is located on the shaft 254 .
- the prongs 256 and 258 are similar to the prongs 206 and 208 .
- the prongs 256 and 258 are much thicker than the prongs 206 and 208 .
- the removal tool 250 is configured to work with a decoupler 262 shown in FIG. 31 .
- the decoupler 262 includes a flange 264 and a stem 266 .
- the stem 266 includes a threaded portion 268 .
- Removal of the insert 104 is accomplished by insertion of the threaded portion 268 of the decoupler 220 into the threaded bore 128 as shown in FIG. 32 .
- the prongs 256 and 258 are then positioned between the flange 264 and the upper surface 114 of the stem 102 . Once positioned, the impact knob 260 is impacted. The force of the impact is transferred through the inclined surfaces of the tapered prongs 256 and 258 to the flange 264 forcing the insert 104 away from the stem 102 .
- Decoupling of the insert 230 is accomplished in a similar manner as the threaded portion 268 of the decoupler 220 is threaded into the threaded bore 240 as shown in FIG. 33 .
- the prongs 256 and 258 are then positioned between the flange 264 and the upper surface 114 of the stem 102 . Once positioned, the impact knob 260 is impacted. The force of the impact is transferred through the inclined surfaces of the tapered prongs 256 and 258 to the flange 264 forcing the insert 230 away from the stem 102 .
- a different removal tool may be provided for use with each of the inserts 104 and 230 .
- other devices may be used to provide an impact to the flange 264 .
Abstract
Description
- The present disclosure relates to joint prostheses, and particularly to prostheses having articulating head components. More specifically, the disclosure relates to a system for achieving variable positions for the head component of a joint prosthesis relative to a bone-engaging portion of the prosthesis.
- Repair and replacement of human joints, such as the knee, shoulder, elbow and hip, has become a more and more frequent medical treatment. Longer life spans mean that the joints are subjected to wear and tear over an extended period of time. Additionally, participation in sports activities results in a greater likelihood of serious joint injuries. Treatment of injuries, wear, and disease in human joints has progressed from the use of orthotics to mask the problem, to fusion of the joint, to the use of prostheses to replace the damaged joint component(s).
- As the success rate for total or partial joint replacements has increased, so too has the need for modularity and universality in the joint prosthesis. Patient variety means that no single size or configuration of joint prosthesis provides optimum results for each patient. The physical dimensions of a patient's joint components vary, as do the bio-mechanic relationship between the components within a particular joint. By way of example, in a shoulder prosthesis, the relationship between the articulating humeral and glenoid components can be significantly different between patients. These relationships are especially important where only one component of the joint is being replaced and must integrate with the existing natural opposing joint component.
- For instance, in many shoulder surgeries, only the humeral component is replaced, leaving the glenoid component intact. In this case, it is imperative that the articulating surface of the humeral component match the articulating surface of the glenoid component as perfectly as possible, both statically and dynamically. With a typical humeral prosthesis, version and inclination are adjusted by the geometry of the head of the prosthesis. In other words, certain pre-determined head geometries are available that can be selected for a mating glenoid component. Unless a virtually infinite variety of pre-determined head geometries are maintained in inventory, the resulting humeral prosthesis will rarely provide an optimum fit with the glenoid component of the shoulder joint.
- In a typical surgical procedure, a trial component is used to determine the optimum component configuration for the permanent prosthetic device. In most cases, the surgeon is able to make a selection of components and configurations that fits the joint in an acceptable manner. In some cases, however, the functionality of the fit cannot be fully assessed until the surgery is completed and the patient has had an opportunity to utilize the repaired joint. In some cases, a revision surgery is necessary to replace a prosthetic device that is not optimally sized or configured for the particular patient. One type of revision surgery requires removal of the entire prosthesis from the bone and replacement with a different prosthesis.
- There is a significant need for a joint prosthesis that is both modular and universal. A further need exists for a prosthesis that is easily manipulated during the surgery and capable being configured in a nearly infinite number of version and inclination angle combinations. Additionally, a need exists for a prosthetic device that is easily modified during a revision surgery. Yet a further need exists for a prosthetic device that is modifiable during a revision surgery without the need to completely remove the entire prosthetic assembly from the bone of the patient.
- A method and assembly for achieving variable positions of a head component of a joint prosthesis relative to a bone-engaging portion of the prosthesis is disclosed. In a one embodiment, a prosthesis assembly includes a stem configured to be implanted in a bone and including a first coupling portion, a head having a bearing surface configured to mate with at least one of a natural opposing joint component and a prosthetic opposing joint component, the head further having a second coupling portion, a coupler including a third coupling portion and a fourth coupling portion, the third coupling portion configured to couple with the second coupling portion, and an insert including (i) a fifth coupling portion configured to couple with the fourth coupling portion in any of a plurality of rotational orientations in combination with any of a plurality of roll angles and any of a plurality of pitch angles, and (ii) a sixth coupling portion configured to couple with the first coupling portion only when the insert assumes a predetermined rotational orientation with respect to the stem.
- In a further embodiment, a prosthesis assembly kit includes at least one stem configured to be implanted in a bone, the at least one stem including a keyed stem coupling portion, a plurality of heads, each of the plurality of heads having a bearing surface configured to mate with at least one of a natural opposing joint component and a prosthetic opposing joint component, each of the plurality of heads further having a head coupling portion, at least one first coupler including an upper coupling portion and a lower coupling portion, the upper coupling portion configured to couple with the head coupling portion of each of the plurality of heads, and at least one insert including (i) a non-keyed insert coupling portion configured to couple with the lower coupling portion of each of the at least one first couplers in any of a plurality of rotational orientations in combination with any of a plurality of roll angles and any of a plurality of pitch angles, and (ii) a keyed insert coupling portion configured to couple with the keyed stem coupling portion of each of the at least one stems.
- In yet another embodiment, a method of forming a prosthesis includes implanting a stem in a bone, the stem including a first coupling portion, determining a desired orientation of a head with respect to the stem, coupling the head with a first coupling portion of a coupler, coupling a second coupling portion of the coupler with an insert, aligning a key member of the coupled insert with the implanted stem, and coupling the aligned insert with the implanted stem.
- The above-noted features and advantages, as well as additional features and advantages, will be readily apparent to those skilled in the art upon reference to the following detailed description and the accompanying drawings.
- The illustrative devices will be described hereinafter with reference to the attached drawings which are given as non-limiting examples only, in which:
-
FIG. 1 depicts a perspective exploded view of a prosthesis assembly including a stem, an insert, a coupler and a head incorporating principles of the invention; -
FIG. 2 depicts a side plan view of the stem ofFIG. 1 ; -
FIG. 3 depicts a partial cross sectional view of the stem ofFIG. 1 showing a coupling receptacle with a key feature; -
FIG. 4 depicts a partial top plan view of the stem ofFIG. 1 showing the coupling receptacle with the key feature; -
FIG. 5 depicts a cross sectional view of the insert ofFIG. 1 showing an inner coupling receptacle and an outer coupling wall with a key feature; -
FIG. 6 depicts a bottom plan view of the insert ofFIG. 5 showing the periphery of the outer coupling wall and the key feature; -
FIG. 7 depicts a cross sectional view of the coupler ofFIG. 1 showing an upper coupling wall and an lower bulbous coupling; -
FIG. 8 depicts a bottom plan view of the coupler ofFIG. 7 showing the bulbous coupling to be circular in plan view; -
FIG. 9 depicts a cross sectional view of the head ofFIG. 1 showing an upper articulating surface and a lower surface including a coupling receptacle and a recessed area; -
FIGS. 10-13 depict a procedure of coupling of the head ofFIG. 1 with the coupler ofFIG. 1 and coupling the coupler ofFIG. 1 with the insert ofFIG. 1 which may be accomplished prior to implantation in accordance with principles of the invention; -
FIGS. 14-15 depict a procedure of alignment the key member of the insert ofFIG. 1 with the key member of the stem ofFIG. 1 and coupling of the insert with the stem; -
FIGS. 16-19 depict the combinations of version and inclination angles at which the coupler ofFIG. 1 may be coupled with the insert ofFIG. 1 ; -
FIG. 20 depicts a perspective view of a removal tool that may be included in a kit and used to decouple the head ofFIG. 1 from the coupler ofFIG. 1 ; -
FIG. 21 depicts a partial cross sectional view of the assembled prosthesis assembly ofFIG. 1 showing a gap into which the prongs of the removal tool ofFIG. 20 may be inserted to decouple the head ofFIG. 1 from the coupler ofFIG. 1 ; -
FIG. 22 depicts a partial cross sectional view of the assembled prosthesis assembly ofFIG. 1 showing a gap into which the prongs of the removal tool ofFIG. 20 may be inserted to decouple the head ofFIG. 1 from the coupler ofFIG. 1 when the axis of the head is not aligned with the axis of the stem receptacle; -
FIG. 23 depicts a perspective view of the removal tool ofFIG. 20 positioned to decouple the head ofFIG. 1 from the coupler ofFIG. 1 ; -
FIG. 24 depicts a partial cross sectional view of the assembled prosthesis assembly ofFIG. 1 with the end portions of the prongs of the removal tool ofFIG. 20 inserted in the gap between the head and the stem; -
FIG. 25 depicts a partial cross sectional view of the assembled coupler and insert ofFIG. 1 with portions of the prongs of the removal tool ofFIG. 20 inserted between the stem and the shoulder portion of the coupler for decoupling of the coupler and the insert; -
FIG. 26 depicts a partial cross sectional view of the insert and stem ofFIG. 1 with a threaded decoupler partially threaded into the threaded bore of the insert for decoupling of the insert and the stem; -
FIG. 27 depicts a side plan view of an alternative insert that may be used to couple the head ofFIG. 1 with the stem ofFIG. 1 with the axis of the head parallel to the axis of the stem receptacle; -
FIG. 28 depicts a partial cross sectional view of the alternative coupler ofFIG. 27 ; -
FIG. 29 depicts a partial cross sectional view of the stem and head ofFIG. 1 assembled using the coupler ofFIG. 27 ; -
FIG. 30 depicts a perspective view of a removal tool that may be included in a kit and used to decouple the coupler ofFIG. 1 from the insert ofFIG. 1 or that insert ofFIG. 27 ; -
FIG. 31 depicts a side plan view of a decoupler with a threaded stem and a flange that may be included in a kit and used to decouple the coupler ofFIG. 1 from the insert ofFIG. 1 or the insert ofFIG. 27 ; -
FIG. 32 depicts a partial cross sectional view of the insert and stem ofFIG. 1 with the decoupler ofFIG. 31 threaded into the threaded bore of the insert for decoupling of the insert and the stem; and -
FIG. 33 depicts a partial cross sectional view of the insert ofFIG. 27 and the stem ofFIG. 1 with the decoupler ofFIG. 31 threaded into the threaded bore of the insert for decoupling of the insert and the stem. - Corresponding reference characters indicate corresponding parts throughout the several views.
- For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and described in the following written specification. It is understood that no limitation to the scope of the invention is thereby intended. It is further understood that the present invention includes any alterations and modifications to the illustrated embodiments and includes further applications of the principles of the invention as would normally occur to one skilled in the art to which this invention pertains.
-
FIG. 1 depicts a perspective view of ahumeral prosthesis assembly 100. Theassembly 100 is the humeral component of a shoulder prosthesis that can be implanted in the humerus bone of a patient for articulating engagement with the natural glenoid or with a glenoid prosthesis. Theassembly 100 includes astem 102 configured to be implanted within the humerus bone in an acceptable manner. Theassembly 100 further includes aninsert 104, acoupler 106 and an articulatinghead component 108. - With further reference to
FIGS. 2-4 , thestem 102 includes ashaft 110 and aplatform area 112. Theplatform area 112 includes anupper surface 114 that faces toward the glenoid component of the joint when thestem 102 is implanted within a patient. Theupper surface 114 defines atapered bore 116 that includes akey member 118. - The
insert 104, shown inFIGS. 1 , 5, and 6, includes anouter wall 120 which generally tapers from anupper portion 122 to alower portion 124. Atapered bore 126 opens to theupper portion 122 and a threadedbore 128 opens at one end to thelower portion 124 and opens at the other end to thetapered bore 126. Akey member 130 is located near thelower portion 124. - The
coupler 106 includes anupper coupling portion 132 and alower coupling portion 134 joined by amiddle portion 136 as shown inFIGS. 7 and 8 . Theupper coupling portion 132 includes abore 138 and a taperedouter wall 140. Themiddle portion 136 includes ashoulder portion 142 which tapers inwardly from the taperedouter wall 140 to aneck portion 144. Thelower coupling portion 134 is bulbous shaped when viewed in profile (FIG. 7 ) and circular when viewed in plan (seeFIG. 8 ). - Referring to
FIGS. 1 and 9 , the articulatinghead component 108 includes an outer articulatingsurface 148, which is shaped to articulate with a glenoid component, and alower surface 150. Thelower surface 150 includes aprotuberance 152 defining atapered bore 154. A recessedarea 156 extends between theprotuberance 152 and alip 158 which circumscribes thelower surface 150. - Assembly of the
humeral prosthesis assembly 100 in one embodiment may be performed once thestem 102 has been implanted within the bone of a patient. A trial (not shown) is used to determine the head size and the version and inclination angle combination of the head that provides the desired joint configuration. Thecoupler 106 may then be joined with the articulatinghead component 108 of the desired size by aligning thetapered bore 154 with theupper coupling portion 132 as shown inFIG. 10 . - The
tapered bore 154 and theouter wall 140 of theupper coupling portion 132 in this embodiment have a five degree taper. Thetapered bore 154 and theouter wall 140 thus provide for a Morse taper coupling. Accordingly, movement of the articulatinghead component 108 in the direction of thearrow 160 onto theupper coupling portion 132 provides the configuration ofFIG. 11 . The articulatinghead component 108 and thecoupler 106 are then firmly coupled by impacting the articulatinghead component 108 onto thecoupler 106. - With reference to
FIG. 12 , thelower coupling portion 134 of thecoupler 106 is then aligned with the tapered bore 126 of theinsert 104 and the articulatinghead component 108 and thecoupler 106 are moved in the direction of thearrow 162. Insertion and impacting of thelower coupling portion 134 within the tapered bore 126 results in the configuration ofFIG. 13 . Specifically, thelower coupling portion 134 has a diameter that is larger than the diameter of thetapered bore 126 at a location spaced apart from theupper portion 122 of theinsert 104. Thus, while a Morse taper coupling is not formed, thelower coupling portion 134 may be firmly secured within the taperedbore 126 by application of sufficient force. Preferably, the force used to secure thelower coupling portion 134 within the taperedbore 126 is greater than the force used when forming a Morse taper coupling. - Once the
head 108, thecoupler 106 and theinsert 104 have been coupled, thelower portion 124 of theinsert 104 is aligned with thetapered bore 116 as shown inFIG. 14 . Thekey member 130 and thekey member 118 are configured such that thelower portion 124 may be fully inserted into thetapered bore 116 in a single rotational configuration. Accordingly, theinsert 104 must be rotated as necessary to align thekey member 130 and thekey member 118. Consequently, the axis of thebore 116 is collocated with the axis of theinsert 104. - The
tapered bore 116 and theouter wall 120 of theinsert 104 in this embodiment have a ten degree taper. Thetapered bore 116 and theouter wall 120 thus provide for a Morse taper coupling. Accordingly, movement of theinsert 104 in the direction of the arrow 164 into thetapered bore 116 provides the configuration ofFIG. 15 . Theinsert 104 and thestem 102 are then firmly coupled by impacting the articulatinghead component 108 to force the articulatinghead component 108, thecoupler 106 and theinsert 104 toward thestem 102. - Alternatively, the
coupler 106 and theinsert 104 may be positioned with the implantedstem 102 prior to coupling thehead 108 with thecoupler 106. Thehead 108 is then positioned and coupled with the previously positionedcoupler 106 and theinsert 104. This alternative may be used in rescission surgeries to allow for a smaller incision to be used to access the surgical site. -
FIG. 15 depicts a configuration wherein the axes of the tapered bore 154 of the articulatinghead component 108, thecoupler 106, theinsert 104 and thetapered bore 116 are substantially aligned. Because the articulatinghead component 108 and thecoupler 106 form a Morse taper coupling as discussed above, the articulatinghead component 108 will assume a specific axial alignment with respect to thecoupler 106 when the articulatinghead component 108 is coupled with thecoupler 106. Likewise, because theinsert 104 and thestem 102 form a Morse taper coupling as discussed above, theinsert 104 will assume a specific axial alignment with respect to thestem 102 when theinsert 104 is coupled with thestem 102. - Therefore, the axial alignment of the articulating
head component 108 with respect to thestem 102 may be established by controlling the axial alignment of thecoupler 106 with theinsert 104. Moreover, thekey members insert 104 with respect to thestem 102. Therefore, the rotational orientation of the articulatinghead component 108 with respect to thestem 102 may be established by controlling the rotational alignment of thecoupler 106 with theinsert 104. Accordingly, the desired axial and rotational alignment of the articulatinghead component 108 with respect to thestem 102 may be established by controlling the rotational and axial alignment of thecoupler 106 with theinsert 104. - Rotational and axial alignment of the
coupler 106 with theinsert 104 is discussed more fully with initial reference toFIG. 16 .FIG. 16 depicts thegeometric center 170 of thelower coupling portion 134. Thelower coupling portion 134 is formed such that the diameter of thelower coupling portion 134 along a plane that includes thegeometric center 170 and is located between theaxes tapered bore 126 at a location between theupper portion 122 of theinsert 104 and the bottom of thetapered bore 126. - Accordingly, the
coupler 106 may be coupled with theinsert 104 with any axial or rotational alignment so long as thelower coupling portion 134 is oriented within the tapered bore 126 such that a plane that includes thegeometric center 170, and is perpendicular to theaxis 176 of theinsert 104, is located between theaxes - By way of example, the
axis 180 of thecoupler 106 is aligned with the axis 170 (theaxis 180 is depicted as offset from theaxis 170 inFIG. 16 for purpose of clarity). Additionally, theplane 182, which includes thegeometric center 170, is perpendicular to theaxis 176 of theinsert 104 and is located between theaxes coupler 106 and theinsert 104 may be coupled in the configuration shown inFIG. 16 . -
FIG. 17 shows thecoupler 106 pivoted in a direction away form thekey member 130, thereby generating an angle a between theaxis 180 and theaxis 170. Nonetheless, theplane 182, which includes thegeometric center 170 and is perpendicular to theaxis 176 of theinsert 104, is still located between theaxes coupler 106 and theinsert 104 may be coupled in the configuration shown inFIG. 17 . Similarly, thecoupler 106 and theinsert 104 may be coupled in the configuration shown inFIG. 18 wherein thecoupler 106 is pivoted in a direction toward thekey member 130, thereby generating an angle a between theaxis 180 and theaxis 170. - Moreover, because the
lower coupling portion 134 is circular when viewed from the bottom (seeFIG. 8 ), thecoupler 106 may be pivoted from side to side with respect to thekey member 130. Thus, as shown inFIG. 19 , thecoupler 106 and theinsert 104 may coupled in any desired combination of inclination and version angles that positions theaxis 180 of thecoupler 106 within acone 184 originating from theaxis 170 and having a cone angle of φ. In one embodiment, thecoupler 106 may be positioned within about 15 degrees of theaxis 180 in any direction, thereby providing a cone angle of about 30 degrees. The cone angle for a particular embodiment is typically limited by impingement of either theinsert 104 on theshoulder 142 or impingement of thestem 102 on thelower surface 150. Accordingly, the cone angle may be modified by selection of the shape and dimensions of, for example, theneck 144 andshoulder 142 of thecoupler 106, theprotuberance 152, the recessedarea 156 and theplatform 112. - Disassembly of the
assembly 100 is possible using theremoval tool 200 ofFIG. 20 . Theremoval tool 200 includes abase 202 and ashaft 204. Twoprongs base 202 and animpact knob 210 is located on theshaft 204. Theprongs tapered bore 116 and are narrowed at thedistal end portions distal end portions FIG. 21 ) between theprotuberance 152 and theupper surface 114 of theshaft 102. Even when the articulatinghead component 108 is angled with respect to theshaft 102 as shown inFIG. 22 , thegap 220 is present. - Accordingly, disassembly of the
assembly 100 is accomplished by maneuvering theprongs head component 108 and theupper surface 114 of thestem 102 as shown inFIG. 23 . The recessedarea 156 facilitates the positioning of thedistal end portions prongs protuberance 152 and theupper surface 114 of theshaft 102 as shown inFIG. 24 . Once positioned, theimpact knob 210 is impacted. The force of the impact is transferred through the inclined surfaces of the taperedprongs protuberance 152 forcing the articulatinghead component 108 away from thestem 102. The impact will typically break the coupling between theouter wall 140 of thecoupler 106 and thetapered bore 154, allowing the articulatinghead 108 to be removed from thecoupler 106. - The distance between the
prongs distal end portions base 202. Specifically, the distance between theprongs distal end portions base 202 corresponds to the diameter of theneck 144. Accordingly, once the articulatinghead component 108 is removed, theprongs neck 144 as shown inFIG. 25 . Theprongs shoulder portion 142 of thecoupler 106. If desired, the upper inner surface of theprongs shoulder portion 142 as shown inFIG. 25 . A subsequent impact on theimpact knob 210 decouples thecoupler 106 from theinsert 104. - Finally, the
insert 104 is removed by insertion of a threadeddecoupler 220 into the threaded bore 128 as shown inFIG. 26 . As the threadeddecoupler 220 is threaded into threadedbore 128, the threadeddecoupler 220 contacts the bottom of thetapered bore 116. Additional rotation of the threadeddecoupler 220 breaks the coupling between theinsert 104 and thetapered bore 116. - A new humeral prosthetic assembly may then be assembled using the
stem 102 along with anew insert 104, anew coupler 106, and a new articulatinghead component 108. The orientation of the new articulatinghead component 108 may be set in the manner described above. Instrumentation which may be used to couple the articulatinghead component 108 and thecoupler 106 at the desired orientation with theinsert 104 is described in U.S. Publication No. 2005/0288681, published on Dec. 29, 2005, which is herein incorporated by reference. - Subjecting a bone to high impact forces may cause further injury or fracturing of the bone. Additionally, applying high impact forces to an implanted stem could move the stem within the bone resulting in misalignment of the prosthesis. Coupling the
insert 104 and thecoupler 106 prior to implanting theinsert 104 within the bone of a patient thus allows a much higher impact force to be used than would typically be used to form a couple while one of the components is implanted. The use of a higher force provides a stronger coupling which better resists further movement between the components. - Specifically, the impact force used to form the Morse taper coupling between the
insert 104 and thestem 102 is passed through thecoupler 106. Because the axis of thecoupler 106 may not be aligned with theaxis 176 of theinsert 104, forming the Morse taper coupling applies a torque to thecoupler 106 tending to change the alignment of thecoupler 106. Since theinsert 104 and thecoupler 106 may be coupled using a force higher than the force used to form a Morse taper coupling, however, passing the force necessary to couple theinsert 104 to thestem 102 through thecoupler 106 does not significantly change the alignment of thecoupler 106 within the taperedbore 126. - In the event the axis of the tapered bore 154 of the articulating
head component 108 is desired to be parallel with the axis of thetapered bore 116, thecoupler 106 and insert 104 need not be used. Rather, theinsert 230 shown inFIGS. 27 and 28 may be used. Theinsert 230 includes an uppertapered wall portion 232 and a lower tapered wall portion 234. Abore 236 extends from theupper surface 238 of theinsert 230 to a threadedbore 240. - The upper tapered
wall portion 232 is configured with a taper that provides a Morse taper coupling with thetapered bore 154 while the lower tapered wall portion 234 is configured with a taper that provides a Morse taper coupling with thetapered bore 116. Theinsert 230 may thus be used to couple the articulatinghead component 108 with thestem 102 as shown inFIG. 28 wherein theinsert 230 is coupled with thetapered bore 116 at a location above thekey member 128. - The
humeral prosthesis assembly 100 is thus a modular system that can be used to provide a number of different orientations of an articulating head component with respect to a stem. Accordingly, a kit including stems 102 of different lengths, at least oneinsert 104, at least onecoupler 106, at least oneinsert 230, and aremoval tool 200 provides a highly adaptable system that can accommodate a wide range of joint constructs. - Additional removal systems may be provided in a kit for use with the
humeral prosthesis assembly 100. By way of example, aremoval tool 250 shown inFIG. 30 may be used to decouple theinsert 104 and theinsert 230 from thestem 102. Theremoval tool 250 includes abase 252 and ashaft 254. Twoprongs base 252 and animpact knob 260 is located on theshaft 254. Theprongs prongs prongs prongs - The
removal tool 250 is configured to work with adecoupler 262 shown inFIG. 31 . Thedecoupler 262 includes aflange 264 and a stem 266. The stem 266 includes a threadedportion 268. Removal of theinsert 104 is accomplished by insertion of the threadedportion 268 of thedecoupler 220 into the threaded bore 128 as shown inFIG. 32 . Theprongs flange 264 and theupper surface 114 of thestem 102. Once positioned, theimpact knob 260 is impacted. The force of the impact is transferred through the inclined surfaces of the taperedprongs flange 264 forcing theinsert 104 away from thestem 102. - Decoupling of the
insert 230 is accomplished in a similar manner as the threadedportion 268 of thedecoupler 220 is threaded into the threaded bore 240 as shown inFIG. 33 . Theprongs flange 264 and theupper surface 114 of thestem 102. Once positioned, theimpact knob 260 is impacted. The force of the impact is transferred through the inclined surfaces of the taperedprongs flange 264 forcing theinsert 230 away from thestem 102. - If desired, a different removal tool may be provided for use with each of the
inserts flange 264. - Although the present invention has been described with respect to certain preferred embodiments, it will be appreciated by those of skill in the art that other implementations and adaptations are possible. Moreover, there are advantages to individual advancements described herein that may be obtained without incorporating other aspects described above. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.
Claims (14)
Priority Applications (1)
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US13/214,630 US20110307071A1 (en) | 2008-06-11 | 2011-08-22 | Joint Prosthesis with Positionable Head |
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US12/137,378 US8002838B2 (en) | 2008-06-11 | 2008-06-11 | Joint prosthesis with positionable head |
US13/214,630 US20110307071A1 (en) | 2008-06-11 | 2011-08-22 | Joint Prosthesis with Positionable Head |
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US13/214,630 Abandoned US20110307071A1 (en) | 2008-06-11 | 2011-08-22 | Joint Prosthesis with Positionable Head |
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US20180193169A1 (en) * | 2015-07-27 | 2018-07-12 | Hip Innovation Technology, Llc. | Femoral cup and femoral ball extractor |
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GB0705911D0 (en) * | 2007-03-28 | 2007-05-09 | Depuy Int Ltd | A head component of an orthopaedic joint prosthesis |
DE102010010073B4 (en) * | 2010-02-26 | 2013-03-07 | Aap Implantate Ag | Connector for modular components |
GB201007656D0 (en) | 2010-05-07 | 2010-06-23 | Depuy Ireland Ltd | Rotatable collar for a prosthetesis |
DE102010052634A1 (en) * | 2010-11-29 | 2012-05-31 | Martin Imhof | Implantable prosthesis for shoulder joint, has retainer comprising peripheral edge, where opening angle of casing surface of edge is selected, such that projection is clamped into retainer in self-locking manner in different tilting angles |
EP2685939B1 (en) * | 2011-03-16 | 2016-11-02 | Smith&Nephew, Inc. | Anatomic guide |
US9421106B2 (en) | 2011-12-07 | 2016-08-23 | Howmedica Osteonics Corp. | Reverse shoulder baseplate with alignment guide for glenosphere |
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Also Published As
Publication number | Publication date |
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EP2133041A1 (en) | 2009-12-16 |
AU2009202473A1 (en) | 2010-01-07 |
US20090312838A1 (en) | 2009-12-17 |
JP2009297515A (en) | 2009-12-24 |
US8002838B2 (en) | 2011-08-23 |
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