WO2008104889A2 - Trapezometacarpal joint prosthesis - Google Patents

Trapezometacarpal joint prosthesis Download PDF

Info

Publication number
WO2008104889A2
WO2008104889A2 PCT/IB2008/001139 IB2008001139W WO2008104889A2 WO 2008104889 A2 WO2008104889 A2 WO 2008104889A2 IB 2008001139 W IB2008001139 W IB 2008001139W WO 2008104889 A2 WO2008104889 A2 WO 2008104889A2
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
head
joint
component
trapezium
Prior art date
Application number
PCT/IB2008/001139
Other languages
French (fr)
Other versions
WO2008104889A3 (en
Inventor
Jean-Jacques Martin
Original Assignee
Small Bone Innovations International
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Small Bone Innovations International filed Critical Small Bone Innovations International
Publication of WO2008104889A2 publication Critical patent/WO2008104889A2/en
Publication of WO2008104889A3 publication Critical patent/WO2008104889A3/en

Links

Classifications

    • 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
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4241—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
    • 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
    • A61F2/42—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4241—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers
    • A61F2002/4256—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers for carpo-metacarpal joints, i.e. CMC joints
    • A61F2002/4258—Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for hands, e.g. fingers for carpo-metacarpal joints, i.e. CMC joints for trapezo-metacarpal joints of thumbs
    • 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

Definitions

  • the present invention relates to a trapezometacarpal joint prosthesis.
  • Figure 1 is a perspective view thereof, before assembly;
  • Figure 2 is a view thereof similar to figure 1, after assembly;
  • Figure 3 is a side view thereof, before assembly;
  • Figure 4 is a view thereof similar to figure 3, after assembly, and
  • Figure 5 is a view thereof after implantation.
  • the trapezometacarpal joint may undergo degeneration following arthrosis or bone necrosis, resulting in a loss of mobility and joint pain.
  • One method of treating such a condition is to remove all or part of the trapezium and fit an implant in the space created by the removal of the trapezium.
  • Removal, or ablation, of the trapezium has a drawback of impairing the natural joint, which is not a desirable outcome.
  • Certain implants fitted in the space created by ablation of the trapezium may not be satisfactory, and may, over time, deteriorate, collapse or become worn given the recurrent stress to which they are subjected.
  • trapezometacarpal joint prostheses include (1) a cup-shaped implant that is fitted on the trapezium and (2) an implant comprising a medullary shaft and a spherical joint head that is fitted in the first metacarpal. The joint head cooperates with a corresponding cavity of the cup.
  • Such trapezometacarpal joint prostheses have a drawback of not being able to be fitted when the trapezium is in poor condition, such as following osteoporosis or bone necrosis.
  • ablation is, in some cases necessary and generally causes damage of the trapezium making the fitting of a replacement prosthesis difficult or impossible.
  • the joint prostheses described above have a drawback of insignificant joint clearance, that is, reproduction of the natural joint, particularly in terms of amplitude of movement of the first metacarpal with respect to the trapezium cannot be achieved.
  • the present invention aims to remedy all these drawbacks.
  • the present invention provides a trapezometacarpal joint prosthesis that can be fitted on the trapezium, even when the trapezium is in poor condition, therefore preserving the trapezium whenever possible.
  • the present invention also provides a joint prosthesis, making it possible to reproduce the movement of the natural joint, even in the event of ablation of the trapezium.
  • the present invention also provides a joint prosthesis with a significant joint clearance, so as to reproduce the natural movement.
  • the prosthesis comprises:
  • a substantially screw-shaped trapezoscaphoid component comprising a threaded body intended to be screwed into the scaphoid and a cylindrical head, said head delimiting an internal cavity; - an intermediate component including, at a first end, a fitting intended to be inserted into said internal cavity of the trapezoscaphoid component and, at a second end, a spherical joint head, and
  • metacarpal component comprising a medullary shaft intended to be inserted into the medullary canal of the first metacarpal and a spherical joint cavity intended to cooperate with said spherical head.
  • the trapezoscaphoid component due to its threaded body intended to be screwed into the scaphoid, enables the prosthesis according to the invention to adopt a stable support in the scaphoid. Therefore, the trapezium is not required for anchoring the prosthesis. As such, the trapezium may be preserved whenever possible, even when it is in poor condition.
  • the cylindrical head of the trapezoscaphoid component is intended to be implanted in a bore provided in the subsisting trapezium and thus enables stabilisation of the trapezium with respect to the prosthesis, even if the trapezium is in poor condition.
  • the cylindrical head makes it possible to provide an internal cavity enabling the assembly of the intermediate component, which comprises a spherical joint head capable of cooperating with the corresponding joint cavity of the metacarpal component.
  • the spherical joint head at the trapezium end and the joint cavity at the first metacarpal end enable the prosthesis to have a significant joint clearance, so as to reproduce the movement of the natural joint.
  • the internal cavity has a conical shape with a low slope and said first end of the intermediate component has a corresponding conical shape enabling it to be fitted in said cavity.
  • the cylindrical head comprises at least two notches provided on the end thereof opposite the threaded body. In another embodiment, the cylindrical head comprises at least four notches. The notches serve to provide support for a screwing instrument of the threaded body in the scaphoid.
  • the metacarpal component comprises a medullary shaft, including an assembly cavity opening into a proximal end, and an independent proximal end, delimiting the joint cavity.
  • the independent proximal end includes a proximal head that comprises a pin intended to be inserted into the assembly cavity for the assembly of the proximal end of the medullary shaft.
  • the assembly cavity has a conical shape with a low slope and the pin has a corresponding conical shape enabling it to be fitted in the assembly cavity.
  • figures 1 to 4 represent a trapezometacarpal joint prosthesis 1, which comprises a trapezoscaphoid component 2, an intermediate component 3 and a metacarpal component 4.
  • the trapezoscaphoid component 2 is substantially screw-shaped, comprising a threaded body 5 and a cylindrical head 6.
  • This head 6 delimits a conical internal cavity with a low slope, opening on the side opposite the threaded body 5, and comprises four notches 7 provided on the same side, serving as support for a screwing instrument (not shown).
  • the intermediate component 3 comprises, at a first end, a fitting 8 intended to be inserted into said internal cavity of the trapezoscaphoid component 2, and, at a second end, a spherical joint head 9.
  • the fitting 8 has a conical shape corresponding to that of the internal cavity of the component 2, enabling it to be fitted into the cavity.
  • the spherical head 9 is intended to cooperate with a joint cavity 10 comprised by the metacarpal component 4.
  • This metacarpal component 4 comprises two parts 4a and 4b.
  • Part 4a is a medullary shaft intended to be inserted in the medullary canal of the first metacarpal and part 4b is an independent proximal head, delimiting said joint cavity 10.
  • Part 4a includes an assembly cavity 11 opening into the proximal end thereof, and part 4b comprises a pin 12 intended to be inserted in said assembly cavity 11 for the assembly of part 4b on part 4a.
  • the assembly cavity 11 has a conical shape with a low slope and the pin 12 has a corresponding conical shape enabling it to be inserted into said cavity 11.
  • the method for implanting the prosthesis according to the present invention includes:
  • the head 6 Upon screwing the threaded body 5 into the scaphoid 102, the head 6 is thereby inserted tightly into the bore and the metacarpal component 4 is implanted on the first metacarpal 101.
  • the intermediate component 3 is then connected to the trapezoscaphoid component 2 by engaging the end 8 thereof in the internal cavity of the trapezoscaphoid component 2, and the head 9 is inserted in the joint cavity 10.
  • the trapezoscaphoid component 2 enables the prosthesis 1 to adopt a stable support in the scaphoid 102 and therefore does not require anchoring in the trapezium 100. As such, the trapezium 100 may be preserved whenever possible, even if it is in poor condition.
  • the head 6 of the component 2 enables stabilisation of the trapezium 100 with respect to the prosthesis 1, even if the trapezium 100 is in poor condition.
  • the head 6 makes it possible to provide the internal cavity enabling the assembly of the intermediate component 3.
  • Joint head 9 is located at the trapezium 100 end while the joint cavity 10 is located at the first metacarpal 101 end, and each enables the prosthesis 1 to have a significant joint clearance, so as to reproduce the movement of the natural joint.
  • the invention provides a trapezometacarpal joint prosthesis displaying decisive advantages:

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

The present invention relates to a trapezometacarpal joint prosthesis comprising: (a) a substantially screw-shaped trapezoscaphoid component (2) comprising a threaded body (5) and a cylindrical head (6), said head delimiting an internal cavity; (b) an intermediate component (3) including, at a first end, a fitting (8) and, at a second end, a spherical joint head (9); and (c) a metacarpal component (4) comprising a medullary shaft (4a) and a • spherical joint cavity (10).

Description

TITLE Trapezometacarpal Joint Prosthesis
FIELD OF THE INVENTION The present invention relates to a trapezometacarpal joint prosthesis.
DESCRIPTION OF THE FIGURES
The invention will be understood clearly and other characteristics and advantages thereof will emerge, with reference to the appended schematic figure, representing, as a non-limiting example, a preferred embodiment of a joint prosthesis according to the present invention.
Figure 1 is a perspective view thereof, before assembly; Figure 2 is a view thereof similar to figure 1, after assembly; Figure 3 is a side view thereof, before assembly; Figure 4 is a view thereof similar to figure 3, after assembly, and
Figure 5 is a view thereof after implantation.
DETAILED DESCRIPTION
The trapezometacarpal joint may undergo degeneration following arthrosis or bone necrosis, resulting in a loss of mobility and joint pain. One method of treating such a condition is to remove all or part of the trapezium and fit an implant in the space created by the removal of the trapezium.
Removal, or ablation, of the trapezium has a drawback of impairing the natural joint, which is not a desirable outcome. Certain implants fitted in the space created by ablation of the trapezium may not be satisfactory, and may, over time, deteriorate, collapse or become worn given the recurrent stress to which they are subjected.
Other types of trapezometacarpal joint prostheses include (1) a cup-shaped implant that is fitted on the trapezium and (2) an implant comprising a medullary shaft and a spherical joint head that is fitted in the first metacarpal. The joint head cooperates with a corresponding cavity of the cup. Such trapezometacarpal joint prostheses have a drawback of not being able to be fitted when the trapezium is in poor condition, such as following osteoporosis or bone necrosis. In addition, ablation is, in some cases necessary and generally causes damage of the trapezium making the fitting of a replacement prosthesis difficult or impossible. Moreover, the joint prostheses described above have a drawback of insignificant joint clearance, that is, reproduction of the natural joint, particularly in terms of amplitude of movement of the first metacarpal with respect to the trapezium cannot be achieved. The present invention aims to remedy all these drawbacks.
The present invention provides a trapezometacarpal joint prosthesis that can be fitted on the trapezium, even when the trapezium is in poor condition, therefore preserving the trapezium whenever possible.
The present invention also provides a joint prosthesis, making it possible to reproduce the movement of the natural joint, even in the event of ablation of the trapezium.
The present invention also provides a joint prosthesis with a significant joint clearance, so as to reproduce the natural movement.
In one aspect of the present invention, the prosthesis comprises:
- a substantially screw-shaped trapezoscaphoid component, comprising a threaded body intended to be screwed into the scaphoid and a cylindrical head, said head delimiting an internal cavity; - an intermediate component including, at a first end, a fitting intended to be inserted into said internal cavity of the trapezoscaphoid component and, at a second end, a spherical joint head, and
- a metacarpal component comprising a medullary shaft intended to be inserted into the medullary canal of the first metacarpal and a spherical joint cavity intended to cooperate with said spherical head.
In an embodiment of the invention, the trapezoscaphoid component, due to its threaded body intended to be screwed into the scaphoid, enables the prosthesis according to the invention to adopt a stable support in the scaphoid. Therefore, the trapezium is not required for anchoring the prosthesis. As such, the trapezium may be preserved whenever possible, even when it is in poor condition. The cylindrical head of the trapezoscaphoid component is intended to be implanted in a bore provided in the subsisting trapezium and thus enables stabilisation of the trapezium with respect to the prosthesis, even if the trapezium is in poor condition. In an embodiment of the invention, the cylindrical head makes it possible to provide an internal cavity enabling the assembly of the intermediate component, which comprises a spherical joint head capable of cooperating with the corresponding joint cavity of the metacarpal component. The spherical joint head at the trapezium end and the joint cavity at the first metacarpal end enable the prosthesis to have a significant joint clearance, so as to reproduce the movement of the natural joint.
In an embodiment of the invention, the internal cavity has a conical shape with a low slope and said first end of the intermediate component has a corresponding conical shape enabling it to be fitted in said cavity.
In an embodiment of the invention, the cylindrical head comprises at least two notches provided on the end thereof opposite the threaded body. In another embodiment, the cylindrical head comprises at least four notches. The notches serve to provide support for a screwing instrument of the threaded body in the scaphoid.
In an embodiment of the invention, the metacarpal component comprises a medullary shaft, including an assembly cavity opening into a proximal end, and an independent proximal end, delimiting the joint cavity. The independent proximal end includes a proximal head that comprises a pin intended to be inserted into the assembly cavity for the assembly of the proximal end of the medullary shaft.
In an embodiment of the invention, the assembly cavity has a conical shape with a low slope and the pin has a corresponding conical shape enabling it to be fitted in the assembly cavity.
Referring to the Figures, figures 1 to 4 represent a trapezometacarpal joint prosthesis 1, which comprises a trapezoscaphoid component 2, an intermediate component 3 and a metacarpal component 4.
The trapezoscaphoid component 2 is substantially screw-shaped, comprising a threaded body 5 and a cylindrical head 6. This head 6 delimits a conical internal cavity with a low slope, opening on the side opposite the threaded body 5, and comprises four notches 7 provided on the same side, serving as support for a screwing instrument (not shown).
The intermediate component 3 comprises, at a first end, a fitting 8 intended to be inserted into said internal cavity of the trapezoscaphoid component 2, and, at a second end, a spherical joint head 9. The fitting 8 has a conical shape corresponding to that of the internal cavity of the component 2, enabling it to be fitted into the cavity.
The spherical head 9 is intended to cooperate with a joint cavity 10 comprised by the metacarpal component 4. This metacarpal component 4 comprises two parts 4a and 4b. Part 4a is a medullary shaft intended to be inserted in the medullary canal of the first metacarpal and part 4b is an independent proximal head, delimiting said joint cavity 10. Part 4a includes an assembly cavity 11 opening into the proximal end thereof, and part 4b comprises a pin 12 intended to be inserted in said assembly cavity 11 for the assembly of part 4b on part 4a. The assembly cavity 11 has a conical shape with a low slope and the pin 12 has a corresponding conical shape enabling it to be inserted into said cavity 11.
As shown in figure 5, a bore is provided in the trapezium 100, and has a slightly greater diameter than the external diameter of the head 6. In an embodiment of the invention, the method for implanting the prosthesis according to the present invention includes:
- resection of the proximal end of the first metacarpal;
- insertion of the trapezoscaphoid component 2 via the bore; and
- screwing the threaded body 5 of said component into the scaphoid 102 by means of the an instrument that engages the notches 7.
Upon screwing the threaded body 5 into the scaphoid 102, the head 6 is thereby inserted tightly into the bore and the metacarpal component 4 is implanted on the first metacarpal 101. The medullary shaft formed by part 4a of the component being inserted in the medullary canal of the first metacarpal 101. The intermediate component 3 is then connected to the trapezoscaphoid component 2 by engaging the end 8 thereof in the internal cavity of the trapezoscaphoid component 2, and the head 9 is inserted in the joint cavity 10.
The trapezoscaphoid component 2 enables the prosthesis 1 to adopt a stable support in the scaphoid 102 and therefore does not require anchoring in the trapezium 100. As such, the trapezium 100 may be preserved whenever possible, even if it is in poor condition. The head 6 of the component 2 enables stabilisation of the trapezium 100 with respect to the prosthesis 1, even if the trapezium 100 is in poor condition. The head 6 makes it possible to provide the internal cavity enabling the assembly of the intermediate component 3. Joint head 9 is located at the trapezium 100 end while the joint cavity 10 is located at the first metacarpal 101 end, and each enables the prosthesis 1 to have a significant joint clearance, so as to reproduce the movement of the natural joint.
In this way, as described above, the invention provides a trapezometacarpal joint prosthesis displaying decisive advantages:
- of being able to be fitted even when the trapezium 100 is in poor condition, for example, following osteoporosis or necrosis, or following the ablation of an existing prosthesis, and therefore preserve said trapezium whenever possible;
- of perfectly reproducing the movement of the natural joint, even in the event of ablation of the trapezium;
- of having a significant joint clearance.
The invention is not limited to the embodiment described above as an example but extends to all the embodiments covered by the appended claims.

Claims

What is claimed is: 1. A trapezometacarpal joint prosthesis comprising:
(a) a substantially screw-shaped trapezoscaphoid component comprising a threaded body and a cylindrical head, said head delimiting an internal cavity;
(b) an intermediate component including, at a first end, a fitting and, at a second end, a spherical joint head; and
(c) a metacarpal component comprising a medullary shaft and a spherical joint cavity. 2. The prosthesis according to claim 1, wherein said internal cavity has a conical shape with a low slope and said first end of the intermediate component has a corresponding conical shape enabling it to be fitted in said cavity. 3. The prosthesis according to claim 1 wherein the cylindrical head comprises at least two notches on the end thereof opposite said threaded body. 4. The prosthesis according to claim 3, wherein the medullary shaft comprises an assembly cavity opening into a proximal end, and an independent proximal end, delimiting the spherical joint cavity, and further wherein the independent proximal end comprises a proximal head and a pin. 5. The prosthesis according to claim 4, wherein the assembly cavity has a conical shape with a low slope and the pin has a corresponding conical shape enabling it to be fitted in the assembly cavity.
PCT/IB2008/001139 2007-02-28 2008-02-28 Trapezometacarpal joint prosthesis WO2008104889A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0701425 2007-02-28
FR0701425A FR2912899B1 (en) 2007-02-28 2007-02-28 TRAPEZO-METACARPIAN JOINT PROSTHESIS

Publications (2)

Publication Number Publication Date
WO2008104889A2 true WO2008104889A2 (en) 2008-09-04
WO2008104889A3 WO2008104889A3 (en) 2008-11-20

Family

ID=38561186

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/001139 WO2008104889A2 (en) 2007-02-28 2008-02-28 Trapezometacarpal joint prosthesis

Country Status (2)

Country Link
FR (1) FR2912899B1 (en)
WO (1) WO2008104889A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2980105B1 (en) 2011-09-21 2013-10-04 3S Ortho JOINT PROSTHESIS FOR SMALL BONES, ESPECIALLY A TRAPEZO-METACARPIAN OR INTER-PHALANGIAN PROSTHESIS AND TOGETHER SHAPED BY SUCH A PROSTHESIS AND BY EXTRACTION INSTRUMENTS OF SAID PROSTHESIS

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955916A (en) * 1989-05-01 1990-09-11 Techmedica, Inc. Thumb joint prosthesis
DE4412721A1 (en) * 1993-04-15 1994-10-20 Tornier Une S A Francaise Ets Carpometacarpal prosthesis
FR2720628A1 (en) * 1994-06-03 1995-12-08 Provis Sa Trapezo-metacarpal joint prosthesis
FR2770770A1 (en) * 1997-11-07 1999-05-14 Fixano Trapezo-metacarpal articulation prostheses
FR2881945A1 (en) * 2005-02-14 2006-08-18 Fixano Soc Par Actions Simplif Trapezo-metacarpal prosthesis comprises trapezoid and metacarpal components with anchoring sections and interacting convex and concave surfaces

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4955916A (en) * 1989-05-01 1990-09-11 Techmedica, Inc. Thumb joint prosthesis
DE4412721A1 (en) * 1993-04-15 1994-10-20 Tornier Une S A Francaise Ets Carpometacarpal prosthesis
FR2720628A1 (en) * 1994-06-03 1995-12-08 Provis Sa Trapezo-metacarpal joint prosthesis
FR2770770A1 (en) * 1997-11-07 1999-05-14 Fixano Trapezo-metacarpal articulation prostheses
FR2881945A1 (en) * 2005-02-14 2006-08-18 Fixano Soc Par Actions Simplif Trapezo-metacarpal prosthesis comprises trapezoid and metacarpal components with anchoring sections and interacting convex and concave surfaces

Also Published As

Publication number Publication date
FR2912899B1 (en) 2010-02-19
FR2912899A1 (en) 2008-08-29
WO2008104889A3 (en) 2008-11-20

Similar Documents

Publication Publication Date Title
US9820853B2 (en) Acetabular cup system
US9295556B2 (en) Minimally invasive total hip replacement
CA2675170C (en) Two piece cancellous construct for cartilage repair
US6143030A (en) Impaction allograft form and method of orthopaedic surgery using same
US9289299B2 (en) Method and apparatus for augumenting bone defects
US6156070A (en) Allograft prosthetic joints and method
US7648530B2 (en) Humeral head prosthesis
US7931691B2 (en) External proximal femoral prosthesis for total hip arthroplasty
EP1968496B1 (en) Hip resurfacing implant
US20070106391A1 (en) Method and apparatus for reducing rim loading of an acetabular shell
US20030065397A1 (en) Prosthetic implant support structure
US20020120340A1 (en) Knee joint prosthesis
US5484443A (en) Instrument for inserting a protective sleeve into the medullary canal of a bone
JP2002521128A (en) Femoral endoprosthesis for hip prostheses
IE892938L (en) A prosthesis
JP2005511243A (en) Hip and shoulder joint prostheses
JP2004113804A (en) Humeral shoulder joint prosthesis
WO2002007654A3 (en) Intervertebral spacer and implant insertion instrumentation
US5009666A (en) Plug and method of use
GB2494388A (en) Stemless shoulder implant assembly
JP6285554B2 (en) Mounting and connecting members for thumb carpal metacarpal joint prosthesis, and thumb carpal metacarpal joint prosthesis
EP0910991B1 (en) Orthopedic reaming instrument
US20040078084A1 (en) Prosthetic implant and method of use
WO2008104889A2 (en) Trapezometacarpal joint prosthesis
US20080009949A1 (en) Joint Prosthesis and Method of Bone Fixation

Legal Events

Date Code Title Description
NENP Non-entry into the national phase in:

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08737605

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 08737605

Country of ref document: EP

Kind code of ref document: A2