Anatomically guided instrumentation for trochlear groove replacement

Patent metadata

Field	Value
Publication number	US-9358117-B2
Application number	US-201414188915-A
Country	US
Kind code	B2
Filing date	Feb 25, 2014
Priority date	Feb 25, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A system for replacing a trochlear groove region of a femur. The system includes a prosthesis that includes a bone contact surface and a periphery that defines an outer perimeter. The bone contact surface has a plurality of protrusions and a spatial configuration with respect to one another. Additionally, the system includes a first template that has a plurality of guide holes and a first periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. Also, included in the system is a second template that has a plurality of guide holes and a second periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. The plurality of guide holes of the second template are spatially arranged with respect to the second periphery to substantially match the spatial configuration of the plurality of protrusions of the prosthesis.

First claim

The invention claimed is:

1. A prosthesis for implantation within a prepared trochlear groove of a femur bone, comprising:
a first region having a first bone contact surface; and
a second region having a second bone contact surface, the second bone contact surface having an annulus projecting outwardly therefrom for insertion into a bone void formed in the femur bone, the annulus at least partially enclosing a base surface having a boundary defined by the annulus,
wherein a first plane defined by the first bone contact surface intersects a second plane defined by the second bone contact surface, and
wherein the annulus has a longitudinal axis intersecting the second plane.

2. The prosthesis of claim 1 , wherein the annulus includes a sidewall, and the sidewall and base surface at least partially define a cavity for receipt of a bone adhesive.

3. The prosthesis of claim 2 , wherein the sidewall terminates at a rim located further from the second bone contact surface than the base surface.

4. The prosthesis of claim 2 , wherein the sidewall includes at least one cut-out extending through the sidewall and being in fluid communication with the cavity.

5. The prosthesis of claim 4 , wherein the at least one cut-out is a single cut-out that extends through the sidewall from an interior surface thereof and out through an exterior surface thereof in a direction toward the first bone contact surface.

6. The prosthesis of claim 4 , wherein the at least one cut-out and sidewall defines an open rim.

7. The prosthesis of claim 4 , wherein the at least one cut-out is a plurality of cut-outs that are arranged in a radial array about a circumference of the sidewall of the annulus.

8. The prosthesis of claim 1 , further comprising at least one protrusion extending from the first bone contact surface and having a longitudinal axis intersecting the first bone contact surface.

9. The prosthesis of claim 8 , wherein the at least one protrusion is a cylindrical peg.

10. The prosthesis of claim 8 , wherein the at least one protrusion is a plurality of cylindrical pegs spatially arranged in a triangular pattern within the perimeter of the first bone contact surface.

11. The prosthesis of claim 1 , wherein the second bone contact surface consists essentially of the annulus.

12. The prosthesis of claim 1 , wherein the base surface closes the annulus from one end thereof.

13. A prosthesis for implantation within a prepared trochlear groove of a femur, comprising:
an articular side having an articular surface forming a groove for articulation of a patella; and
a bone contacting side, disposed opposite the articular side, having first and second portions and an annulus projecting from one of the first and second portions for insertion into a bone void formed in the femur, the annulus at least partially enclosing a base surface having a boundary defined by the annulus.

14. The prosthesis of claim 13 , wherein the first portion includes a planar bone contact surface for contacting an anterior resected surface of the femur.

15. The prosthesis of claim 13 , wherein the annulus includes a sidewall, the sidewall and base surface defining a cavity, the cavity having a depth extending between the base surface and an opening of the annulus and being configured to receive a cement mantle therein for fixation to the femur.

16. The prosthesis of claim 15 , wherein a sidewall opening extends through the sidewall and communicates with the cavity.

17. The prosthesis of claim 16 , wherein the opening faces the first portion of the bone contacting side.

18. A prosthesis for implantation within a prepared trochlear groove of a femur bone, comprising:
an articular side having an articular surface for articulation of a patella; and
a bone contacting side having first and second portions adjacently disposed, the first portion having a planar bone contacting surface for contacting a resected surface of a femur, the second portion having an annulus extending therefrom and a base surface, the base surface closing the annulus from one end thereof, and the base surface and annulus defining a cavity.

19. The prosthesis of claim 18 , wherein the first portion includes a plurality of elongate members projecting from the bone contacting surface.

20. The prosthesis of claim 18 , wherein the annulus incudes an opening in fluid communication with the cavity and extending from the cavity toward the first portion.

Assignees

• Stryker Corp

Inventors

• Collazo Carlos E
• Axelson Jr Stuart L
• Ferko Michael C
• Hampp Emily

Classifications

• A61F2/3877 Primary

  Patellae or trochleae · CPC title

• A61B17/1764

  for the knee · CPC title

• A61F2002/30878

  with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts · CPC title

• A61B17/155

  Cutting femur · CPC title

• A61B17/1675

  for the knee · CPC title