Knee joint prosthesis system and method for implantation

• US 8,480,751 B2
• Filed: 08/02/2012
• Issued: 07/09/2013
• Est. Priority Date: 01/10/2007
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Metzger, Robert, Brown, David R., May, Brian M., Watson, Audra, Belcher, Nathan E.
• Primary Examiner(s): Isabella, David
• Application Number:
  US13/564,848
• Publication Number:
  US 20120296438A1
• Time in Patent Office: 341 Days
• Field of Search: 623 2014- 2036
• US Class Current: 623/20.28
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3836 Special connection between upper and lower leg, e.g. constrained
• CPC Class Codes: A61F 2/385 also provided with condylar bearing surfaces
• CPC Class Codes: A61F 2/3868 with sliding tibial bearing
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30339 Double cones, i.e. connecting element having two conical connections, one at each of its opposite ends
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30369 Limited lateral translation of the protrusion within a larger recess
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/3069 Revision endoprostheses
• CPC Class Codes: A61F 2002/30736 Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
• CPC Class Codes: A61F 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit

Abstract

A prosthesis system for replacing a knee joint between a femur and a tibia can include a first femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion and a second sidewall offset from the first sidewall a first distance and extending superiorly from the second condylar portion. A tibial component can have a bone engaging inferior surface and a bearing engaging superior surface. A bearing can have an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface. The bearing can define an opening and a bearing keyway. A first yoke and a second yoke can each have an inferior portion, a superior portion, and a yoke keyway extending therethrough.

Claims

1. A prosthesis system for replacing a knee joint between a femur and a tibia, the prosthesis comprising:

a first femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion, a second sidewall offset from the first sidewall a first distance and extending superiorly from the second condylar portion;

a tibial component having a bone engaging inferior surface and a bearing engaging superior surface;

a bearing having an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface, the bearing defining an opening and a bearing keyway;

a first yoke and a second yoke each having an inferior portion, a superior portion and a yoke keyway extending therethrough, the superior portion of the first yoke having an axle assembly that expands along its axis, the superior portion of the second yoke cooperating with a solid axle that spans a second distance greater than the first distance;

a first key that is removably inserted into the first yoke keyway and the bearing keyway and interfaces with the axle assembly; and

a second key that is removably inserted into the second yoke keyway and the bearing keyway and interfaces with the solid axle;

wherein the first or second yoke is selectively and alternatively connected between the first femoral component and the bearing in an assembled position;

wherein the axle assembly includes a pair of axle posts that expand outward towards the first and the second sidewalls of the first femoral component upon advancement of the first key into the yoke keyway.

2. The prosthesis system of claim 1 wherein the solid axle defines a notch and wherein the second key locates in the notch in the assembled position.

3. The prosthesis system of claim 1 wherein the pair of axle posts include first threads formed on the first pair of axle posts.

4. The prosthesis system of claim 3 wherein the axle assembly further comprises an axle shaft that is threadably connected to the first threads of the pair of axle posts, wherein rotation of the axle shaft causes the pair of axle posts to threadably interface with the axle shaft and advance inwardly or outwardly based on the rotation.

5. The prosthesis system of claim 4, further comprising a first gear on the axle shaft that meshingly engages a second gear provided on the first key.

6. The prosthesis system of claim 5 wherein the first gear rotates upon linear advancement of the first key into the yoke keyway.

7. The prosthesis system of claim 1, further comprising a second femoral component and a third yoke, wherein the second femoral component comprises a cam engaging surface and is configured as a posterior stabilized knee.

8. The prosthesis system of claim 7, further comprising a hyper-extension stop that selectively couples with one of the first femoral component and the first yoke during flexion of the first femoral component and controls an amount of hyper-extension of the first femoral component relative to the tibial component.

9. A prosthesis system for replacing a knee joint between a femur and a tibia, the prosthesis comprising:

a first femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion, a second sidewall offset from the first sidewall a first distance and extending superiorly from the second condylar portion;

a tibial component having a bone engaging inferior surface and a bearing engaging superior surface;

a bearing having an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface, the bearing defining an opening and a bearing keyway;

a first yoke having a first yoke keyway extending therethrough, the first yoke having an axle assembly that expands along its axis;

a second yoke having a second yoke keyway extending therethrough, the second yoke cooperating with a solid axle;

a first key that is removably inserted into the first yoke keyway and the bearing keyway and interfaces with the axle assembly; and

a second key that is removably inserted into the second yoke keyway and the bearing keyway and interfaces with the solid axle;

wherein the first or second yoke is selectively and alternatively connected between the femoral component and the bearing in an assembled position;

wherein the axle assembly includes a pair of axle posts that expand outward towards the first and the second sidewalls of the first femoral component upon advancement of the first key into the yoke keyway.

10. The prosthesis system of claim 9 wherein the solid axle defines a notch and wherein the second key locates in the notch in the assembled position.

11. The prosthesis system of claim 9 wherein the pair of axle posts include first threads formed on the first pair of axle posts.

12. The prosthesis system of claim 11 wherein the axle assembly further comprises an axle shaft that is threadably connected to the first threads of the pair of axle posts, wherein rotation of the axle shaft causes the pair of axle posts to threadably interface with the axle shaft and advance inwardly or outwardly based on the rotation.

13. The prosthesis system of claim 12, further comprising a first gear on the axle shaft that meshingly engages a second gear provided on the first key.

14. The prosthesis system of claim 13 wherein the first gear rotates upon linear advancement of the first key into the yoke keyway.

15. The prosthesis system of claim 9, further comprising a second femoral component and a third yoke, wherein the second femoral component comprises a cam engaging surface and is configured as a posterior stabilized knee.

16. The prosthesis system of claim 15, further comprising a hyper-extension stop that selectively couples with one of the first femoral component and the first yoke during flexion of the first femoral component and controls an amount of hyper-extension of the first femoral component relative to the tibial component.

17. A prosthesis system for replacing a knee joint between a femur and a tibia, the prosthesis comprising:

a first femoral component including a first condylar portion, a second condylar portion, a first pair of closed sidewalls extending superiorly from the first and second condylar portions, respectively;

a second femoral component having a second pair of open sidewalls;

a tibial component having a bone engaging inferior surface and a bearing engaging superior surface;

a bearing having an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface, the bearing defining an opening and a bearing keyway;

a first yoke having a first yoke keyway extending therethrough, the first yoke having an axle assembly that expands along its axis;

a second yoke having a second yoke keyway extending therethrough, the second yoke cooperating with a solid axle;

a third yoke having a third yoke keyway, the third yoke configured to position between the first pair of closed sidewalls;

a first key that is removably inserted into the first yoke keyway and the bearing keyway and interfaces with the axle assembly; and

a second key that is removably inserted into the second yoke keyway and the bearing keyway and interfaces with the solid axle;

wherein the first, second or third yoke is selectively and alternatively connected between a selected first or second femoral component and the bearing in an assembled position;

wherein the axle assembly includes a pair of axle posts that expand outward towards the first and the second sidewalls of the first femoral component upon advancement of the first key into the yoke keyway.