Concave resurfacing prosthesis

1. A glenoid component for use with a prosthetic humeral component for use in performing shoulder arthroplasty, said glenoid component to be fitted at least partially within a cavity defined by the interior walls of the cortical bone of the scapula forming the glenoid vault, said glenoid component comprising a body having a stem portion for substantially filling the glenoid vault, said stem portion defining a longitudinal axis thereof and an external periphery thereof, the external periphery of said stem portion in intimate contact with the interior cortical wall of the glenoid vault completely around the external periphery of the stem portion in a plane normal to the longitudinal axis of the stem portion, said body having a bearing portion for articulating cooperation with the prosthetic humeral component.

2. The glenoid component of claim 1 , wherein said body comprises a plastic.

3. The glenoid component of claim 2 , wherein said stem portion is integral with said body.

4. The glenoid component of claim 1 , further comprising a support layer surrounding at least a portion of said body.

5. The glenoid component of claim 4 , wherein said support layer comprises a metal.

6. The glenoid component of claim 1 , further comprising fastener extending from said body.

7. The glenoid component of claim 1 , wherein said glenoid component is adapted to be secured to the glenoid with bone cement.

8. The glenoid component of claim 1 , wherein said stem comprises at least one of a bone cement, a metal, or a plastic.

9. A glenoid component for use with a prosthetic humeral component for use in performing shoulder arthroplasty, said glenoid component to be fitted at least partially into a cavity formed in the glenoid vault, the cavity defined by the interior cortical walls of the scapula forming the glenoid vault, said glenoid component comprising a body having a stem for inserting at least partially into the cavity formed in the glenoid vault, said stem defining a longitudinal axis thereof, said stem in intimate contact with the interior cortical walls of the cavity formed in the glenoid vault completely around the external periphery of the stem portion in a plane normal to the longitudinal axis of the stem portion, said body having a bearing portion for articulating cooperation with the prosthetic humeral component, wherein said stem has a unitary construction and is conformable to be positionable within the glenoid vault and expands upon being positioned in the glenoid vault to conform to the inner cortical walls of the glenoid vault.

10. A glenoid component for use with a prosthetic humeral component for use in performing shoulder arthroplasty, said glenoid component to be fitted at least partially into a cavity formed in the glenoid vault, the cavity defined by the interior cortical walls of the scapula forming the glenoid vault, said glenoid component comprising a body having a stem portion for inserting at least partially into the cavity formed in the glenoid vault, said stem portion cooperating with the interior wall of the cavity formed in the glenoid vault, said body having a bearing portion for articulating cooperation with the prosthetic humeral component, wherein said stem portion comprising a expander operably connected to said body and positioned at least partially within the body cavity, said expander defining opposed ends thereof, wherein opposed ends of said expander are urged against opposed interior cortical walls of the interior cortical walls of the glenoid vault.

11. The glenoid component of claim 10 , wherein said expander comprises:

screw; and

a tube defining an axial slot thereon, said tube defining a longitudinal axis thereof and being threadably connected to said screw, a portion of said tube being moveable in a direction normal to the longitudinal axis of said tube upon rotating said screw with respect to said tube for selective intimate contact with the opposed interior cortical walls of the interior cortical walls of the glenoid vault.

12. The glenoid component of claim 10 , wherein said expander comprises:

a screw; and

a member at least partially positioned in the body cavity, said member being threadably connected to said screw, said screw wedgingly threadably expanding said member into intimate contact with the opposed sides of the interior cortical wall of the glenoid vault.

13. A kit for use in performing shoulder arthroplasty, said kit comprising:

a tool for use in removing substantially all the cancellous bone from the cavity defined by the interior cortical walls of the glenoid vault for performing shoulder arthroplasty; and

a glenoid component comprising a body having a unitary stem portion for substantially filling the glenoid vault, said stem portion defining a longitudinal axis thereof, said stem portion in intimate contact with the interior cortical wall of the glenoid vault completely around the extemal periphery of the stem portion in a plane normal to the longitudinal axis of the stem portion, said glenoid component for use with a prosthetic humeral component for use in performing shoulder arthroplasty.

14. The kit of claim 13 further comprising a humeral stem for implantation into the humerus.

15. The kit of claim 13 , wherein said glenoid component is adapted to be fitted at least partially into a cavity formed in the glenoid vault, said glenoid component comprising a body having a stem portion for inserting at least partially into the cavity formed in the glenoid vault, said stem portion cooperating with the interior wall of the cavity formed in the glenoid vault, said body having a bearing portion for articulating cooperation with the prosthetic humeral component.

16. The kit of claim 13 wherein said tool comprises:

a body;

a shank extending in a first direction from said body; and

a cutting edge extending from said body in a direction opposed to said shank, said cutting edge adapted to form a cavity in the glenoid vault.

17. The kit of claim 13 , wherein said body comprises a plastic.

18. The kit of claim 13 , further comprising a support layer surrounding at least a portion of said body.

19. The kit of claim 13 , further comprising fastener extending from said body.

20. The kit of claim 13 , wherein said glenoid component is adapted to be secured to the glenoid with bone cement.

21. A kit for use in performing shoulder arthroplasty, said kit comprising:

a tool for use in forming a cavity in the glenoid vault for performing shoulder arthroplasty;

a glenoid component for use with a prosthetic humeral component for use in performing shoulder arthroplasty, wherein said body defines a body cavity therein, and further comprising an expander operably connected to said body and positioned at least partially within the body cavity, said expander defining opposed ends thereof, wherein opposed ends of said expander are urged against opposed inner cortical walls of the glenoid vault, said expander comprising a first component and a second component threadably connected to said first component.

22. The kit of claim 21 , wherein said expander comprises:

a screw; and

a tube defining an axial slot thereon, said tube defining a longitudinal axis thereof and being threadably connected to said screw, a portion of said tube being moveable in a direction normal to the longitudinal axis of said tube upon rotating said screw with respect to said tube for selective intimate contact with the opposed interior cortical walls of the interior cortical walls of the glenoid vault.

23. The kit of claim 21 , wherein said expander comprises:

a screw; and

a member at least partially positioned in the body cavity, said member being threadably connected to said screw, said screw wedgingly threadably expanding opposed ends of said member into intimate contact with the opposed interior walls of the glenoid vault.