Extended articulation orthopaedic implant and associated method

• US 20040193277A1
• Filed: 03/31/2003
• Published: 09/30/2004
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Long, Jack F., Coon, Michael E.
• Granted Patent: US 7,517,364 B2
• Time in Patent Office: Days
• US Class Current: 623/19.14
• CPC Class Codes: A61B 17/14 Surgical saws A61B17/1637 takes precedence; tooth saws A61C3/12 ; Accessories therefor
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 17/1642 for producing a curved bore
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61B 17/1778 for the shoulder
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61F 2/4003 Replacing only the epiphyseal or metaphyseal parts of the humerus, i.e. endoprosthesis not comprising an entire humeral shaft replacing only the epiphyseal or metaphyseal parts of the femur A61F2/3601
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4612 of shoulders
• CPC Class Codes: A61F 2002/30245 Partial spheres
• CPC Class Codes: A61F 2002/30299 umbrella-shaped or mushroom-shaped
• CPC Class Codes: A61F 2002/3065 Details of the ball-shaped head
• CPC Class Codes: A61F 2002/30769 madreporic
• CPC Class Codes: A61F 2002/4007 implanted without ablation of the whole natural humeral head
• CPC Class Codes: A61F 2230/0093 Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2310/00011 Metals or alloys
• CPC Class Codes: A61F 2310/00179 Ceramics or ceramic-like structures

Abstract

A prosthesis (20) for use in performing joint arthroplasty is provided. The prosthesis (20) is to be fitted to a long bone (3). The prosthesis includes a first body (22) having a first body articulating surface (24) defining a generally circular outer periphery (26) of the first body articulating surface (24). The first body (22) has a support surface (28) opposed to the articulating surface (24). The support surface (28) is adapted to receive the head of the long bone (3). The prosthesis (20) also includes a second body (30) operably associated with the first body (22). The second body (30) has a second body articulating surface (32) extending from a portion of the circular outer periphery (26) of the first body articulating surface (24).

Claims

1. A prosthesis for use in performing joint arthroplasty, said prosthesis to be fitted to a long bone, said prosthesis comprising:

a first body having a first body articulating surface defining a generally circular outer periphery thereof and having a support surface opposed to the first body articulating surface adapted to receive the head of the long bone; and

a second body operably associated with said first body, said second body having a second body articulating surface extending from a portion of the circular outer periphery of said first body articulating surface.

2. The prosthesis of claim 1, further comprising a stem operably associated with one of said first body and said second body, said stem adapted to assist in securing said prosthesis to the long bone.

3. The prosthesis of claim 2, wherein said stem extends from said first body.

4. The prosthesis of claim 2, wherein at least two of said first body, said second body and said stem are integral with each other.

5. The prosthesis of claim 1, wherein said first body is generally hemispherical.

6. The prosthesis of claim 1, wherein said second body is a generally a sector of a hollow sphere.

7. The prosthesis of claim 1, wherein said first body and said second body are generally in the shape of a sector of a hollow sphere.

8. The prosthesis of claim 1:

wherein said second articulating surface and said first articulating surface define a boundary portion there between; and

wherein the boundary portion is generally smooth and continuous.

9. The prosthesis of claim 2:

wherein said first body defines a first body longitudinal centerline;

wherein said stem defines a stem longitudinal centerline; and

wherein said first body longitudinal centerline and said stem longitudinal centerline are coincident.

10. The prosthesis of claim 1, wherein at least one of said first body and said second body comprises at least one of a cobalt chromium alloy, a stainless steel alloy and a titanium alloy.

11. The prosthesis of claim 1, wherein at least one of said first body and said second body includes a porous coating on a portion of the periphery thereof.

12. The prosthesis of claim 1:

wherein the second body articulating surface defines a second surface periphery opposed to said first body;

wherein the generally circular outer periphery defines a first plane; and

wherein the second surface periphery defines a second plane, the first plane and the second plane being non-coincident.

13. The prosthesis of claim 12, wherein the first plane and the second plane define an included angle there between.

14. The prosthesis of claim 13, wherein the included angle is obtuse.

15. The prosthesis of claim 14, wherein the included angle is about 160 to 118 degrees.

16. The prosthesis of claim 15, wherein the included angle is about 138 degrees.

17. The prosthesis of claim 1, wherein at least a portion of the support surface is intimate contact with the bone.

18. The prosthesis of claim 17, wherein at least a portion of the support surface is planar.

19. A tool kit for preparing a humerus to receive a prosthesis with a first body having a first articulating surface and an opposed first support surface and with a second body having a second articulating surface and an opposed second support surface, said kit for preparing the humerus for receiving the prosthesis, said tool kit comprising:

a reamer for preparing a first prepared surface on the humerus for receiving the first support surface; and

a bone cutting tool for preparing a second prepared surface on the humerus for receiving the second support surface.

20. The tool kit of claim 19, wherein said bone cutting tool comprises one of a drill, a reamer, a broach, a saw and an osteotome.

21. The tool kit of claim 20:

wherein said bone cutting tool comprises an end cutting reamer for preparing a plurality of channels in the humerus; and

further comprising a guide for controlling the position and depth of said reamer.

22. The tool kit of claim 19, further comprising a guide for controlling the position of said bone cutting tool.

23. A method of performing shoulder arthroplasty for an indication of rotator cuff tear arthropathy comprising the steps of:

providing a prosthesis with a first body having a first articulating surface and an opposed first support surface and with a second body having a second articulating surface and an opposed second support surface;

providing a tool kit for preparing a humerus for receiving the prosthesis;

preparing a first prepared surface for cooperation with the first support surface with the tool kit;

preparing a second prepared surface for cooperation with the second support surface with the tool kit; and

implanting the prosthesis onto the first prepared surface and the second prepared surface.