Knee joint prosthesis system and method for implantation

• US 8,157,869 B2
• Filed: 01/10/2008
• Issued: 04/17/2012
• 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, Watson, Audra, May, Brian M., Fox, Duke A.
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): Sharma, Yashita
• Application Number:
  US11/972,359
• Publication Number:
  US 20080167722A1
• Time in Patent Office: 1,559 Days
• Field of Search: 623/20.14, 623/20.15, 623/20.21, 623/20.32, 623/20.34, 623/20.35, 623/20.36
• US Class Current: 623/20.36
• CPC Class Codes: A61F 2/30721 Accessories
• CPC Class Codes: A61F 2/38 for elbows or knees
• 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 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30736 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 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit

Abstract

A modular knee prosthesis can include a femoral component having a superiorly extending portion, a first femoral bearing surface and a second femoral bearing surface. The superiorly extending portion can define a first tapered augment receiving surface. A tibial component can have an inferiorly extending portion and a tibial bearing surface. The inferiorly extending portion can define a second tapered augment receiving surface. A first augment can define a first receiving bore and a first stepped surface. A second augment can define a second receiving bore and a second stepped surface. The first and second augments are adapted to mate at the first and second stepped surfaces in a first position at the first tapered augment receiving surface of the femoral component and in a second position at the second tapered augment receiving surface of the tibial component.

Claims

1. A knee joint prosthesis system comprising:

a first knee prosthesis component including a femoral component having a first attachment portion formed thereon;

a second knee prosthesis component including a tibial component having a second attachment portion formed thereon;

at least a first stem defining a stem engagement portion; and

a first adapter having a first adapter engagement portion defining a male insertion portion defining a first axis and a second adapter engagement portion having an offset body portion that is offset from the male insertion portion and includes a female receiving portion defining a second axis, the first and second axes being parallel and offset;

wherein the stem engagement portion is operable to intraoperatively couple directly with each of the second adapter engagement portion, the first attachment portion or the second attachment portion;

and wherein the first adapter engagement portion is operable to intraoperatively couple with the first or the second attachment portion.

2. The system of claim 1 wherein the first knee prosthesis component includes a plurality of femoral components and the second knee prosthesis component includes a plurality of tibial components.

3. The system of claim 2 wherein at least one of the femoral components and at least one of the tibial components cooperate to form each of a crutiate retaining (CR) knee prosthesis, a posterior stabilized (PS) knee prosthesis, a fully constrained knee prosthesis, and a hinged knee prosthesis.

4. The system of claim 3, further comprising a tibial bearing selected from the group consisting of a fixed bearing, a floating bearing, and a rotating bearing.

5. The system of claim 1, further comprising a plurality of stems each having a stem engagement portion and defining distinct lengths or diameters, wherein each of the stem engagement portions are operable to directly couple with each of the first attachment portion, the second attachment portion or the second adapter engagement portion.

6. The system of claim 1, further comprising a plurality of adapters each defining a first axis through a first adapter engagement portion and a second axis through a second adapter engagement portion, wherein an offset defined between a first and a second axis of the first adapter is distinct from an offset defined between a first and a second axis of another adapter of the plurality of adapters.

7. The system of claim 1 wherein the first attachment portion defines a female tapered receiving portion, and the stem engagement portion defines a male tapered insertion portion, wherein the female tapered receiving portion cooperatively engages the male tapered insertion portion by way of a Morse-type taper fit.

8. The system of claim 1, further comprising a first locking member that passes through an adapter bore defined in the first adapter, the first locking member operable to lock the first stem to the first adapter.

9. The system of claim 8 wherein the adapter bore is threaded and wherein the first locking member threadably advances along the adapter bore between an unsecured position and a secured position.

10. The system of claim 9, further comprising an insert secured to the stem wherein the first locking member engages the insert at an interface area in the secured position.

11. The system of claim 10 wherein the first locking member is formed of a harder material than the insert such that a depression is formed in the insert at an interface area upon advancement of the first locking member to the secured position.

12. The system of claim 11 wherein the insert defines a conical head, wherein the first locking member engages the conical head in the secured position.

13. The system of claim 9, further comprising a second locking member that passes through a prosthesis bore defined in the first prosthesis, the second locking member operable to lock the first prosthesis to the first adapter, wherein the first and second locking members are substantially equivalent.

14. The system of claim 13 wherein the prosthesis bore is defined through a femoral box in a femoral component.

15. The system of claim 13 wherein the prosthesis bore is defined through a tray portion of a tibial tray.

16. The system of claim 1 wherein the femoral component and the tibial component are cooperatively coupled by a hinge, wherein the hinge defines a keel having an axle that is biased outwardly along its length, the axle engaging hubs disposed on a femoral box of the femoral component in an implanted position.

17. A knee joint prosthesis system comprising:

a first knee prosthesis component having a first attachment portion formed thereon;

at least a first stem defining a stem engagement portion;

a first insert secured to the stem;

a first adapter having a first adapter engagement portion defining a first axis and a second adapter engagement portion defining a second axis, the first and second axes being parallel and offset, the first adapter defining an adapter bore;

a first locking member formed of a harder material than the first insert and that is configured to pass through the adapter bore between an unsecured position wherein the first stem is unlocked from the second adapter engagement portion and a secured position wherein the first locking member engages the first insert creating a depression in the first insert and locks the first stem to the second adapter engagement portion; and

wherein the first attachment portion is operable to intraoperatively couple directly with each of the stem engagement portion or the first adapter engagement portion.

18. The system of claim 17, further comprising a second knee prosthesis component distinct from the first knee prosthesis component and having a second attachment portion, wherein the second attachment portion is operable to couple with the stem engagement portion or the first engagement portion.

19. The system of claim 18 wherein the first knee prosthesis component is a femoral component and the second knee prosthesis component is a tibial component.

20. The system of claim 19 wherein the first knee prosthesis component includes a plurality of femoral components and the second knee prosthesis component includes a plurality of tibial components.

21. The system of claim 20 wherein at least one of the femoral components and at least one of the tibial components cooperate to form each of a crutiate retaining (CR) knee prosthesis, a posterior stabilized (PS) knee prosthesis, a fully constrained knee prosthesis, and a hinged knee prosthesis.

22. The system of claim 21, further comprising a tibial bearing selected from the group consisting of a fixed bearing, a floating bearing, and a rotating bearing.

23. The system of claim 17 wherein the stem engagement portion is operable to couple with the second adapter engagement portion.

24. The system of claim 17, further comprising a plurality of stems each having a stem engagement portion and defining distinct lengths or diameters, wherein each of the stem engagement portions are operable to directly couple with both of the first attachment portion of the knee prosthesis component or the second adapter engagement portion of the adapter.

25. The system of claim 17, further comprising a plurality of adapters each defining a first axis through a first adapter engagement portion and a second axis through a second adapter engagement portion, wherein an offset defined between a first and a second axis of the first adapter is distinct from an offset defined between a first and a second axis of another adapter of the plurality of adapters.

26. The system of claim 17 wherein the first attachment portion defines a female tapered receiving portion, and the stem engagement portion and the first adapter engagement portion each define a male tapered insertion portion, wherein the female tapered receiving portion cooperatively engages the male tapered insertion portion by way of a Morse-type taper fit.

27. The system of claim 17 wherein the adapter bore is threaded and wherein the first locking member threadably advances along the adapter bore between an unsecured position and a secured position.

28. The system of claim 17, further comprising a second locking member that passes through a prosthesis bore defined in the first prosthesis, the second locking member operable to engage a second insert on the first adapter and lock the first prosthesis to the first adapter, wherein the first and second locking members are substantially equivalent and the first and second inserts are substantially equivalent.

29. The system of claim 28 wherein the prosthesis bore is defined through a femoral box in a femoral component.

30. The system of claim 28 wherein the prosthesis bore is defined through a tray portion of a tibial tray.

31. A knee joint prosthesis system comprising:

a first knee prosthesis component having a first attachment portion formed thereon and a prosthesis bore defined therethrough;

at least a first stem defining a stem engagement portion;

a first adapter having a first adapter engagement portion including a male insertion portion defining a first axis and a second adapter engagement portion having an offset body portion that is offset from the male insertion portion and includes a female receiving portion defining a second axis, the first and second axes being parallel and offset, the first adapter defining an adapter bore;

wherein the stem engagement portion is operable to intraoperatively couple directly with both of the first attachment portion or the first adapter engagement portion;

a first insert extending from the first stem;

a second insert extending from the first adapter engagement portion;

a first locking member that is configured to pass through the prosthesis bore and engage the first insert or the second insert; and

a second locking member that is configured to pass through the adapter bore and engage the first insert, wherein the first and second inserts are substantially equivalent and the first and second locking members are substantially equivalent.

32. The system of claim 31, further comprising a second knee prosthesis component distinct from the first knee prosthesis component and having a second attachment portion, wherein the second attachment portion is operable to couple with the stem engagement portion or the first adapter engagement portion.

33. The system of claim 32 wherein the first knee prosthesis component is a femoral component and the second knee prosthesis component is a tibial component.

34. The system of claim 33 wherein the first knee prosthesis component includes a plurality of femoral components and the second knee prosthesis component includes a plurality of tibial components.

35. The system of claim 34 wherein at least one of the femoral components and at least one of the tibial components cooperate to form each of a crutiate retaining (CR) knee prosthesis, a posterior stabilized (PS) knee prosthesis, a fully constrained knee prosthesis, and a hinged knee prosthesis.

36. The system of claim 35, further comprising a tibial bearing selected from the group consisting of a fixed bearing, a floating bearing, and a rotating bearing.

37. The system of claim 31, further comprising a plurality of stems each having a stem engagement portion and defining distinct lengths or diameters, wherein each of the stem engagement portions are operable to directly couple with both of the first attachment portion of the knee prosthesis component or the second adapter engagement portion of the adapter.

38. The system of claim 31, further comprising a plurality of adapters each defining a first axis through a first adapter engagement portion and a second axis through a second adapter engagement portion, wherein an offset defined between a first and a second axis of the first adapter is distinct from an offset defined between a first and a second axis of another adapter of the plurality of adapters.

39. The system of claim 31 wherein the prosthesis bore and the adapter bore are both threaded and wherein the respective first and second locking members threadably advance along the prosthesis and adapter bores between an unsecured position and a secured position.

40. The system of claim 31 wherein the first and second locking members are formed of a harder material that the first and second inserts such that a depression is formed into the inserts at an interface area upon advancement of the respective first and second locking members to the secured position.

41. The system of claim 40 wherein first and second inserts define a conical head, wherein the respective first and second locking members engage the respective conical heads in the secured position.

42. The system of claim 31 wherein the prosthesis bore is defined through a femoral box in a femoral component.

43. The system of claim 31 wherein the prosthesis bore is defined through a tray portion of a tibial tray.

44. A knee joint prosthesis system comprising:

a first knee prosthesis component including a femoral component having a first attachment portion formed thereon;

a second knee prosthesis component including a tibial component having a second attachment portion formed thereon wherein the femoral component and the tibial component are cooperatively coupled by a hinge, wherein the hinge defines a keel having an axle that is biased outwardly along its length, the axle engaging hubs disposed on a femoral box of the femoral component in an implanted position;

at least a first stem defining a stem engagement portion; and

a first adapter having a first adapter engagement portion including a male insertion portion defining a first axis and a second adapter engagement portion having an offset body portion that is offset from the male insertion portion and includes a female receiving portion defining a second axis, the first and second axes being parallel and offset;

wherein the stem engagement portion is operable to intraoperatively couple with the second adapter engagement portion, the first attachment portion or the second attachment portion;

and wherein the first adapter engagement portion is operable to intraoperatively couple directly with each of the first or the second attachment portion.

45. The system of claim 44 wherein the first knee prosthesis component includes a plurality of femoral components and the second knee prosthesis component includes a plurality of tibial components.

46. The system of claim 44, further comprising a plurality of stems each having a stem engagement portion and defining distinct lengths or diameters, wherein each of the stem engagement portions are operable to couple with the first attachment portion, the second attachment portion or the second adapter engagement portion.