Modular knee prosthesis

• US 7,297,164 B2
• Filed: 08/16/2005
• Issued: 11/20/2007
• Est. Priority Date: 11/22/2002
• Status: Expired due to Fees

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Saladino, Joseph, Johnson, Erin M.
• Primary Examiner(s): GHERBI, SUZETTE JAIME J
• Application Number:
  US11/205,909
• Publication Number:
  US 20050278034A1
• Time in Patent Office: 826 Days
• Field of Search: 623 2014- 203
• US Class Current: 623/20.14
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2002/30187 D-shaped or half-disc-shaped
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• 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 2002/30878 with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30892 parallel
• CPC Class Codes: A61F 2002/30975 made of two halves
• CPC Class Codes: A61F 2002/3895 unicompartimental
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0034 D-shaped

Abstract

A modular prosthetic knee system used to replace the natural knee. The system includes a femoral knee prosthesis and a tibial knee prosthesis. Both prostheses are formed of modular components that are connectable in-vivo to form the prosthetic knee system. The femoral knee prosthesis includes two separate components, a lateral condyle and medial condyle; and the tibial knee prosthesis includes a multiple separate components, a medial baseplate, a lateral baseplate, a medial insert, and a lateral insert. The medial and lateral baseplate are connectable to form a complete baseplate with the medial and lateral inserts connectable to the complete baseplate.

Claims

1. A modular prosthetic knee system, comprising:

a patellar-femoral component having a smooth patellar-femoral articular surface and a bone contacting surface opposite the articular surface;

a first femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a second femoral condylar component having smooth articular surface and a bone contacting surface opposite the articular surface, the patellar-femoral component and the first and second femoral condylar components being selectively connectable together to form alternative prosthetic femoral implants including a unicondylar femoral implant, a bicompartmental femoral implant, and a tricompartmental femoral implant, wherein the components are provided in a range of sizes.

2. The system of claim 1 wherein the components are connectable to form a prosthetic femoral implant in which each component is individually size matched to a corresponding portion of a natural joint.

3. The system of claim 1 wherein the components are provided in a range of thicknesses measured from the articular surface to the bone contacting surface.

4. The system of claim 3 wherein the components are connectable to form a prosthetic femoral implant in which each component thickness is individually matched to a corresponding portion of a natural joint.

5. The system of claim 1 wherein the patellar-femoral component comprises a first portion of a connection mechanism located on an end surface and each of the first and second femoral condylar components comprises a second portion of the connection mechanism located on an end portion, the first portion being engageable with the second portion to connect the components together.

6. The system of claim 1 wherein the components include a connection mechanism including male projections and female recesses engageable with the projections.

7. The prosthesis of claim 6 wherein the projections and recesses have complimentary, non-circular cross sections.

8. The system of claim 6 wherein the projections and recesses connect in press fit relationship.

9. The system of claim 8 wherein the projections and recesses connect in taper locking relationship.

10. The system of claim 6 wherein the projections and recesses connect in snap fit relationship.

11. The system of claim 1 wherein the components are connectable together to form a prosthetic implant having a continuous smooth articular surface and a bone contacting surface having a plurality of planar flat sections.

12. The system of claim 1 wherein the components are connectable in vivo.

13. The system of claim 12 wherein the components are sized to fit individually through a surgical incision.

14. The system of claim 1 wherein the first femoral condylar component is shaped as a medial condylar component and the second femoral condylar component is shaped as a lateral condylar component.

15. The system of claim 1 wherein at least one of the components includes a bone growth enhancing coating.

16. The system of claim 1 wherein at least one of the components includes a cement retention coating.

17. The system of claim 1 wherein at least one of the components includes a CSTi coating.

18. The system of claim 1 further comprising a tibial component engageable with the alternative prosthetic femoral implants.

20. The system of claim 1 wherein the first femoral condylar component further comprises a plurality of separate femoral condylar subcomponents connectable to form the first femoral condylar component.

21. The system of claim 20 wherein the plurality of subcomponents comprises a posterior condylar subcomponent and a distal condylar subcomponent.

22. The system of claim 21 wherein the posterior and distal condylar subcomponents include male projections and female recesses for receiving the projections to connect the subcomponents together.

19. The A modular prosthetic knee system, comprising:

a patellar-femoral component having a smooth patellar-femoral articular surface and a bone contacting surface opposite the articular surface;

a first femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a second femoral condylar component having smooth articular surface and a bone contacting surface opposite the articular surface, the patellar-femoral component and the first and second femoral condylar components being selectively connectable together to form alternative prosthetic femoral implants including a unicondylar femoral implant, a bicompartmental femoral implant, and a tricompartmental femoral implant, wherein the first femoral condylar component is interchangeably connectable to the patellar-femoral component as a medial condylar component and a lateral condylar component.

23. A modular prosthetic knee system, comprising:

a patellar-femoral component having a smooth patellar-femoral articular surface and a bone contacting surface opposite the articular surface;

a first femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a second femoral condylar component having smooth articular surface and a bone contacting surface opposite the articular surface, the patellar-femoral component and the first and second femoral condylar components being selectively connectable together to form alternative prosthetic femoral implants including a unicondylar femoral implant, a bicompartmental femoral implant, and a tricompartmental femoral implant, wherein each condylar component comprises a connection mechanism including a separate member extendable between the condylar component and the patellar-femoral component.

24. The system of claim 23 wherein the tibial component comprises medial and lateral components connectable together in vivo.

25. A unicondylar knee prosthesis, comprising:

a first femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a second femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface, the first and second condylar components being connectable in-vivo to form a unitary unicondylar implant, wherein the first and second condylar components include a connection mechanism comprising a male projection and a female recess engageable with the projection, the projection and recess having complimentary, non-circular cross sections.

26. A knee prosthesis, comprising:

a femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a patellar-femoral component having a smooth patellar-femoral articular surface and a bone contacting surface opposite the articular surface, the condylar component and the patellar-femoral component being connectable in-vivo to form a unitary bicompartmental implant, wherein the patellar-femoral component and the condylar component include a connection mechanism comprising a male projection and a female recess engageable with the projection, the projection and recess having complimentary, non-circular cross sections.

27. A knee prosthesis, comprising:

a patellar-femoral component having a smooth patellar-femoral articular surface and a bone contacting surface opposite the articular surface;

a first femoral condylar component having a smooth articular surface and a bone contacting surface opposite the articular surface; and

a second femoral condylar component having smooth articular surface and a bone contacting surface opposite the articular surface, the patellar-femoral component and the first and second femoral condylar components being connectable in-vivo to form a unitary tricompartmental implant, wherein the patellar-femoral component and the first and second condylar components include a connection mechanism comprising a male projection and a female recess engageable with the projection, the projection and recess having complimentary, non-circular cross sections.

28. The prosthesis of claim 27 wherein the patellar-femoral component includes a transverse abutment surface at an end thereof, the first and second condylar components both connecting to the transverse abutment surface.

29. A femoral knee prosthesis, comprising:

a medial femoral condyle having a smooth outer articular surface in the form of a curved femoral condyle and a bone contacting surface opposite the articular surface;

a lateral femoral condyle having a smooth outer articular surface in the form of a curved femoral condyle and a bone contacting surface opposite the articular surface;

the medial and lateral condyles separated from one another along a sagittal plane and along a transverse plane such that they have substantially different shapes, one of the medial and lateral condyles including an enlarged patellar-femoral joint section and having a first engagement surface in the sagittal plane and a second engagement surface in the transverse plane, the other of the medial and lateral condyles having third and fourth engagement surfaces; and

a connection mechanism operable in vivo to lock the medial and lateral condyles together, the connection mechanism including a male protursion engageable with a female recess, the protrusion and recess having complimentary, non-circular cross sections, wherein the third and fourth engagement surfaces abut the first and second engagement surfaces when the medial and lateral condyles are connected.

30. The prosthesis of claim 29 wherein the bone contacting surface includes a plurality of planar sections.

31. The prosthesis of claim 29 wherein the lateral condyle includes the enlarged patellar-femoral joint section, the patellar-femoral joint section having an approximately rectangular shape the extends over the medial condyle when the medial and lateral condyles are connected.

32. The prosthesis of claim 29 wherein the medial femoral condyle further comprises a lateral side surface and the lateral femoral condyle further comprises a medial side surface, the side surfaces abutting when the medial and lateral femoral condyles are locked together, the connection mechanism being formed on the side surfaces.

33. The prosthesis of claim 29 wherein the male protrusion comprises an outwardly extending rectangular protrusion and the female recess comprises an inwardly extending rectangular recess.

34. The prosthesis of claim 29 wherein the connection mechanism engages in taper locking manner.