Total Knee Arthoplasty System

• US 20080195108A1
• Filed: 02/12/2007
• Published: 08/14/2008
• Est. Priority Date: 02/12/2007
• Status: Active Grant

• Current Assignee: Jmea Corporation
• Original Assignee: Jmea Corporation
• Inventors: Yeh, Jack Y., Bhatnagar, Mohit K.
• Granted Patent: US 8,313,530 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3886 for stabilising knees against anterior or lateral dislocations
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations

Abstract

A total knee arthroplasty (TKA) set that includes a universal cutting jig for shaping the distal femur is disclosed. The universal cutting jig may be used to create a shaped femur that can be receive multiple and different TKA implant designs. A universal high flexion knee system adapted for left-right use is also disclosed.

Claims

1. A system for performing a total knee replacement surgery comprising:

a jig configured to guide a cutting member in cutting a distal portion of a femur and resulting in a prepared distal surface, the prepared distal surface having a prepared shape;

a first femoral component having a first proximal side;

a second femoral component having a second proximal side;

the first proximal side and the second proximal side being substantially similar and configured to engage the prepared shape;

the first femoral component having a first distal side;

the second femoral component having a second distal side; and

wherein the first distal side is shaped differently than the second distal side.

2. The system according to claim 1, wherein the first femoral component includes a corresponding first tibial component.

3. The system according to claim 1, wherein the second femoral component includes a corresponding second tibial component.

4. The system according to claim 1, wherein a third femoral component includes a third proximal side being substantially similar to the first proximal side and wherein the third femoral component includes a third distal side that is shaped differently than either the first distal side or the second distal side.

5. The system according to claim 1, wherein the jig is smaller than a second jig, the second jig configured to guide the cutting member in cutting a second distal portion of a femur and resulting in a second prepared distal surface, the second prepared distal surface having a second prepared shape;

wherein the second prepared shape is larger than the prepared shape.

6. A method for performing a total knee replacement procedure comprising the steps of:

preparing a distal femur by cutting the distal femur with a cutting device that is guided by a jig, and eventually forming a prepared distal femur with a first distal surface;

selecting a selected knee prosthesis from a group of candidate knee prostheses, wherein the group of candidate knee prostheses includes candidate femoral components having similar proximal sides and having substantially different distal sides;

wherein the proximal sides are configured to engage the first distal surface of the prepared distal femur; and

associating the selected femoral component with the prepared distal femur.

7. The method according to claim 6, wherein the proximal sides of the candidate knee prosthesis femoral components include similar proximal surfaces configured to engage the prepared distal surface.

8. The method according to claim 6, wherein the group of candidate knee prostheses is associated with a first size.

9. The method according to claim 8, wherein the first group of candidate knee prostheses is associated with a second group of candidate knee prostheses.

10. The method according to claim 9, wherein the second group of candidate knee prostheses includes candidate femoral components having similar proximal sides and having substantially different distal sides.

11. The method according to claim 10, wherein the second group of candidate knee prostheses is associated with a second size.

12. The method according to claim 11, wherein the first size is different from the second size.

13. A kit of parts comprising:

a set of knee prostheses including a femoral component and a tibial component;

each femoral component of the set of knee prostheses including a proximal side and a distal side;

wherein the proximal side of each femoral component is substantially similar in size and shape;

wherein the distal side of each femoral component is shaped differently; and

wherein each femoral component has a corresponding tibial component to match the distal side of the femoral component.

14. The kit of parts according to claim 13, further comprising a cutting jig.

15. The kit of parts according to claim 13, wherein the set of knee prostheses are similar in size.

16. The kit of parts according to claim 13, wherein each femoral component is configured to be attached to a right femur or a left femur.

17. The kit of parts according to claim 13, wherein each knee prosthesis of the set of knee prostheses is capable of undergoing a high flexion angle.

18. The kit of parts according to claim 17, wherein the high flexion angle is greater than 120 degrees.

19. The kit of parts according to claim 14, wherein the jig is used to shape the distal end of a femur for attaching a femoral component.

20. A system for performing a total knee replacement surgery on a left or right knee comprising:

a jig configured to guide a cutting member in cutting a distal portion of a left femur and resulting in a prepared left distal surface, the prepared left distal surface having a first prepared shape;

the jig configured to guide a cutting member in cutting a distal portion of a right femur and resulting in a prepared right distal surface, the prepared right distal surface having a second prepared shape; and

wherein the first prepared shape and the second prepared shape are substantially identical and configured to receive a universal femoral component for use in either a right knee or a left knee.

21. The system according to claim 20, wherein the universal femoral component is an average of a left femoral component and a right femoral component.

22. The system according to claim 20, wherein the system includes a set of at least two universal femoral components.

23. The system according to claim 22, wherein the proximal sides of each universal femoral component in the set of universal femoral components are similar.

24. The system according to claim 23, wherein the distal sides of each universal femoral component in the set of universal femoral components are substantially different.

25. The system according to claim 24, wherein each universal femoral component of the set of universal femoral components is associated with a distinct tibial component.

26. The system according to claim 24, wherein the sizes of the universal femoral components are similar.

27. A system for performing a total knee replacement surgery comprising:

a jig configured to guide a cutting member in cutting a distal portion of a femur and resulting in a prepared distal surface, the prepared distal surface having a prepared shape;

a first femoral component having a first proximal side;

a second femoral component having a second proximal side;

the first proximal side and the second proximal side being substantially similar and configured to engage the prepared shape;

the first femoral component having a first distal side that is different from a second distal side of the second femoral component; and

wherein each femoral component is configured to be used in a high flexion knee prosthesis.

28. The system according to claim 27, wherein the high flexion knee prosthesis is able to achieve a flexion angle in the range of 90-150 degrees.

29. The system according to claim 27, wherein the high flexion knee prosthesis is able to achieve a flexion angle in the range of 109-150 degrees.

30. The system according to claim 27, wherein the high flexion knee prosthesis is able to achieve a flexion angle in the range of 130-150 degrees.

31. The system according to claim 27, wherein the first femoral component is a universal femoral component that may be used with either a left femur or a right femur.

32. The system according to claim 31, wherein the prepared shape is configured to receive the universal femoral component.

33. The system according to claim 27, wherein the first distal end of the first femoral component is associated with a first tibial component.

34. The system according to claim 33, wherein the second distal end of the second femoral component is associated with a second tibial component.