Arthroplasty system and related methods

• US 20100042105A1
• Filed: 08/24/2009
• Published: 02/18/2010
• Est. Priority Date: 12/18/2007
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Otismed Corporation (Stryker Corporation)
• Inventors: Sarva, Venkata Surya, Choi, Irene Min, Park, Ilwhan
• Granted Patent: US 8,715,291 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/1703 using imaging means, e.g. by X-rays
• CPC Class Codes: A61B 17/1717 for applying intramedullary nails or pins
• CPC Class Codes: A61B 17/1739 specially adapted for particular parts of the body
• CPC Class Codes: A61B 17/1742 for the hip
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

A method of manufacturing an arthroplasty jig is disclosed herein. The method may include the following: generate two dimensional image data of a patient joint to undergo arthroplasty, identify in the two dimensional image data a first point corresponding to an articular surface of a bone forming the joint, identify a second point corresponding to an articular surface of an implant, identify a location of a resection plane when the first point is correlated with the second point, and create the arthroplasty jig with a resection guide located according to the identified location of the resection plane.

Claims

1. A method of manufacturing an arthroplasty jig, the method comprising:

generate two dimensional image data of a patient joint to undergo arthroplasty;

identify in the two dimensional image data a first point corresponding to an articular surface of a bone forming the joint;

identify a second point corresponding to an articular surface of an implant;

identify a location of a resection plane when the first point is correlated with the second point; and

create the arthroplasty jig with a resection guide located according to the identified location of the resection plane.

2. The method of claim 1, wherein the articular surface of the bone forming the joint is a femoral condylar surface, and the articular surface of the implant is a condylar surface of a femoral implant.

3. The method of claim 2, wherein the first point includes a most distal point on the femoral condylar surface.

4. The method of claim 3, wherein the most distal point on the femoral condylar surface includes a most distal point on a healthy femoral condyle and another point on or near an unhealthy femoral condyle, the another point being on a joint line extending from the most distal point on the healthy femoral condyle.

5. The method of claim 4, wherein the joint line is perpendicular to a line defined along a trochlear groove.

6. The method of claim 3, wherein the first point further includes a most proximal point on the femoral condylar surface.

7. The method of claim 6, wherein the most proximal point on the femoral condylar surface includes a most proximal point on a healthy femoral condyle and another point on or near an unhealthy femoral condyle, the another point being on a joint line extending from the most proximal point on the healthy femoral condyle.

8. The method of claim 7, wherein the joint line is perpendicular to a line defined along a trochlear groove.

9. The method of claim 1, wherein the first and second points are correlated in a two dimensional comparison.

10. The method of claim 1, wherein the first point is identified in a coronal view or an axial view of the two dimensional image data.

11. The method of claim 10, wherein the first point is correlated with the second point in a sagittal view.

12. The method of claim 1, wherein the articular surface of the bone forming the joint is a tibia condylar surface, and the articular surface of the implant is a condylar surface of a tibia implant.

13. The method of claim 12, wherein the first point includes a most posterior point on the tibia condylar surface and a most anterior point on the tibia condylar surface.

14. The method of claim 13, wherein the most posterior and most anterior points on the tibia condylar surface include a most posterior point and a most anterior point on a healthy tibia condyle and a most posterior point and a most anterior point on or near an unhealthy tibia condyle, wherein the most posterior and most anterior points on the healthy tibia condyle are on a first line, and the most posterior and most anterior points on or near the unhealthy tibia condyle are on a second line parallel to the first line.

15. The method of claim 14, wherein the first point further includes a most distal point on the healthy tibia condyle and a most distal point on or near the unhealthy tibia condyle.

16. The method of claim 15, wherein the most distal point on the healthy tibia condyle is on the first line and the most distal point on or near the unhealthy tibia condyle is on the second line.

17. The method of claim 1, wherein the first point is identified in a coronal view or a sagittal view of the two dimensional image data.

18. The method of claim 17, wherein the first point is correlated with the second point in an axial view.

19. The method of claim 1, wherein creating the arthroplasty jig with a resection guide located according to the identified location of the resection plane includes providing a jig blank and using CNC to transform the jig blank into the arthroplasty jig.

20. The method of claim 1, wherein creating the arthroplasty jig with a resection guide located according to the identified location of the resection plane includes employing rapid prototyping to generate the arthroplasty jig.

21. The method of claim 20, wherein the rapid prototyping includes SLA.

22. The method of claim 1, further comprising evaluating the implant for size when the first point is correlated with the second point.

23. The method of claim 22, wherein evaluating the implant for size includes selecting the implant from a plurality of candidate implants.

24. The method of claim 1, wherein the two dimensional image data is obtained from a MRI or CT of the patient joint.

25. An arthroplasty jig manufactured according to the method of claim 1.

26. A method of manufacturing an arthroplasty jig, the method comprising:

a) identify a first attribute in a coronal image and a second attribute in an axial image, wherein the attributes are associated with a bone forming a portion of a patient joint;

b) place the first and second attributes in a sagittal relationship;

c) compare in the sagittal relationship the first and second attributes to respective corresponding attributes of a plurality of candidate prosthetic implants;

d) select a prosthetic implant from the comparison of step c;

e) correlate in the sagittal relationship the first and second attributes to respective corresponding attributes of the prosthetic implant;

f) identify the location of a resection plane associated with the prosthetic implant during the correlation of step e; and

g) create the arthroplasty jig with a resection guide located according to the identified location of the resection plane.

27. The method of claim 26, wherein at least one of the images is obtained from a MRI or CT of the patient joint.

28. The method of claim 26, wherein the bone is a femur.

29. The method of claim 28, wherein the first attribute and second attribute are associated with an articular surface of the femur.

30. The method of claim 29, wherein the first attribute includes a most distal point on a condyle of the femur.

31. The method of claim 29, wherein the second attribute includes a most posterior point on a condyle of the femur.

32. The method of claim 29, wherein the first attribute includes a most distal point on a condyle of the femur and the second attribute includes a most posterior point on the condyle of the femur.

33. The method of claim 32, wherein the respective corresponding attributes of the prosthetic implant of step e include a most distal point on a condyle of the prosthetic implant and a most posterior point on the condyle of the prosthetic implant.

34. The method of claim 26, wherein the arthroplasty jig is created via CNC or SLA.

35. A method of manufacturing an arthroplasty jig, the method comprising:

a) identify first and second attributes in a sagittal image, wherein the attributes are associated with a bone forming a portion of a patient joint;

b) place the first and second attributes in an axial relationship;

c) compare in the axial relationship the first and second attributes to respective corresponding attributes of a plurality of candidate prosthetic implants;

d) select a prosthetic implant from the comparison of step c;

e) correlate in the axial relationship the first and second attributes to respective corresponding attributes of the prosthetic implant;

f) identify the location of a resection plane associated with the prosthetic implant during the correlation of step e; and

g) create the arthroplasty jig with a resection guide located according to the identified location of the resection plane.

36. The method of claim 35, wherein at least one of the images is obtained from a MRI or CT of the patient joint.

37. The method of claim 35, wherein the bone is a tibia.

38. The method of claim 37, wherein the first attribute and second attribute are associated with an articular surface of the tibia.

39. The method of claim 38, wherein the first attribute includes a most anterior point on a condyle of the tibia.

40. The method of claim 38, wherein the second attribute includes a most posterior point on a condyle of the tibia.

41. The method of claim 38, wherein the first attribute includes a most anterior point on a condyle of the tibia and the second attribute includes a most posterior point on the condyle of the tibia.

42. The method of claim 41, wherein the respective corresponding attributes of the prosthetic implant of step e include a most anterior point on a condyle of the prosthetic implant and a most posterior point on the condyle of the prosthetic implant.

43. The method of claim 35, wherein the arthroplasty jig is created via CNC or SLA.