Patient selectable knee joint arthroplasty devices

• US 8,945,230 B2
• Filed: 05/12/2010
• Issued: 02/03/2015
• Est. Priority Date: 05/25/2001
• Status: Expired due to Term

• Current Assignee: Conformis Incorporated
• Original Assignee: Conformis Incorporated
• Inventors: Lang, Philipp, Steines, Daniel, Fitz, Wolfgang, Tsougarakis, Konstantinos, Vargas-Voracek, Rene
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): SCHILLINGER, ANN M
• Application Number:
  US12/778,518
• Publication Number:
  US 20100305708A1
• Time in Patent Office: 1,728 Days
• Field of Search: 623 1312- 1319
• US Class Current: 623/20.31
• CPC Class Codes: A61B 5/4504 Bones A61B5/4547 takes precedence
• CPC Class Codes: A61B 5/4514 Cartilage
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61F 2/30942 for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/4657 Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2002/30535 Special structural features of bone or joint prostheses not otherwise provided for
• CPC Class Codes: A61F 2250/0058 Additional features; Implant or prostheses properties not otherwise provided for

Abstract

Disclosed herein are methods and devices for repairing articular surfaces in a knee joint. The articular surface repairs are customizable or highly selectable for each patient and geared toward providing optimal fit and function. Kits are also provided to enable customized repairs to be performed.

Claims

1. A patient-specific implant for a patient'"'"'s knee joint, the implant comprising:

a condyle implant portion having a bone-facing surface configured to oppose at least a portion of the femoral condyle of the patient'"'"'s knee joint and joint-facing surface configured to provide an articular surface, wherein at least a portion of the bone-facing surface has a shape configured to abut one or more planar cut surfaces of the femoral condyle; and

wherein the joint-facing surface has a three-dimensional shape that includes articular shape information of a corresponding portion of the femoral condyle of the patient'"'"'s knee joint, wherein the articular shape information is derived from electronic image data of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

2. The implant of claim 1, wherein the implant includes a trochlear portion having articular shape information of a corresponding trochlear portion of the patient'"'"'s knee joint.

3. The implant of claim 1, wherein a portion of the bone-facing surface configured to abut a planar cut surface of the femoral condyle a predetermined alignment relative to an axis of the patient'"'"'s knee joint.

4. The implant of claim 1, wherein the implant is comprised of a metal or metal alloy and a polymer.

5. The implant of claim 1, further having an attachment structure to attach the implant to the condyle and selected from the group consisting of:

ridges, pegs, pins, cross-members, teeth and protrusions.

6. The implant of claim 5, further having a plurality of structures for attachment.

7. The implant of claim 6, wherein the relative orientation of the structures for attachment are selected from the group consisting of:

symmetrical, asymmetrical, rows, circles, triangles, and random.

8. The implant of claim 1, wherein the second component of the implant covers a portion of a patellar surface.

9. The implant of claim 1, wherein the joint-facing surface of the implant approximates the shape of a healthy femoral condyle of the patient.

10. The implant of claim 1, wherein a condyle mating surface of the implant has at least one planar surface for mating with a prepared condyle having a cut.

11. The implant of claim 10, wherein the at least one planar surface is configured to mate with a prepared medial condyle and a prepared lateral condyle.

12. The implant of claim 10, wherein the at least one planar surface is configured to mate with a prepared medial condyle and a prepared lateral condyle.

13. The implant of claim 1, wherein the articular shape information of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint includes information regarding a curvature of a cartilage surface of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

14. The implant of claim 1, wherein the articular shape information of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint includes information regarding a curvature of a subchondral bone surface of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

15. The implant of claim 1, wherein the three-dimensional shape includes a parametric representation of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

16. A patient-specific knee implant for a patient'"'"'s knee joint, the implant comprising:

a femoral implant having a bone-abutting surface portion and an articular surface portion, wherein the bone-abutting surface portion is sized and shaped to abut the femoral condyle of the patient'"'"'s knee joint; and

wherein the articular surface has a three-dimensional size and shape that includes articular shape information of a corresponding portion of the femoral condyle of the patient'"'"'s knee joint, wherein the articular shape information is derived from electronic image data of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

17. The implant of claim 16, wherein the implant includes a trochlear portion having articular shape information of a corresponding trochlear portion of the patient'"'"'s knee joint.

18. The implant of claim 16, wherein the implant is comprised of a metal or metal alloy and a polymer.

19. The implant of claim 16, further having an attachment structure to attach the implant to the condyle and selected from the group consisting of:

ridges, pegs, pins, cross-members, teeth and protrusions.

20. The implant of claim 19, further having a plurality of structures for attachment.

21. The implant of claim 19, wherein the relative orientation of the structures for attachment are selected from the group consisting of:

symmetrical, asymmetrical, rows, circles, triangles, and random.

22. The implant of claim 16, wherein a second component of the implant covers a portion of a patellar surface.

23. The implant of claim 16, wherein the bone-abutting surface of the implant has at least one plane surface for mating with a prepared condyle having a cut.

24. The implant of claim 16, wherein the articular shape information of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint includes information regarding a size and shape of a cartilage surface of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

25. The implant of claim 16, wherein the articular shape information of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint includes information regarding a size and shape of a subchondral bone surface of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.

26. The implant of claim 16, wherein the three-dimensional shape includes a parametric representation of the corresponding portion of the femoral condyle of the patient'"'"'s knee joint.