GENERATION OF A COMPUTERIZED BONE MODEL REPRESENTATIVE OF A PRE-DEGENERATED STATE AND USEABLE IN THE DESIGN AND MANUFACTURE OF ARTHROPLASTY DEVICES

• US 20090270868A1
• Filed: 04/29/2008
• Published: 10/29/2009
• Est. Priority Date: 04/29/2008
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Otismed Corporation (Stryker Corporation)
• Inventors: Park, Ilwhan, Howell, Stephen M., Chi, Charlie W.
• Granted Patent: US 8,480,679 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 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 2034/102 Modelling of surgical devices, implants or prosthesis
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/108 Computer aided selection or customisation of medical implants or cutting guides
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 5/00 Orthopaedic methods or devices for non-surgical treatment of bones or joints surgical instruments or methods for treatment of bones or joints, devices specially adapted therefor A61B17/56; Nursing devices; Anti-rape devicesbandages, dressings or absorbent pads A61F13/00
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]
• CPC Class Codes: G06T 17/00 Three dimensional [3D] modelling, e.g. data description of 3D objects
• CPC Class Codes: G16H 30/20 for handling medical images, e.g. DICOM, HL7 or PACS
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders

Abstract

Disclosed herein is a method of generating a computerized bone model representative of at least a portion of a patient bone in a pre-degenerated state. The method includes: generating at least one image of the patient bone in a degenerated state; identifying a reference portion associated with a generally non-degenerated portion of the patient bone; identifying a degenerated portion associated with a generally degenerated portion of the patient bone; and using information from at least one image associated with the reference portion to modify at least one aspect associated with at least one image associated the generally degenerated portion. The method may further include employing the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state in defining manufacturing instructions for the manufacture of a customized arthroplasty jig. Also disclosed herein is a customized arthroplasty jig manufactured according to the above-described method. The customized arthroplasty jig is configured to facilitate a prosthetic implant restoring a patient joint to a natural alignment. The prosthetic implant may be for a total joint replacement or partial joint replacement. The patient joint may be a variety of joints, including, but not limited to, a knee joint.

Claims

1. A method of generating a restored bone model representative of at least a portion of a patient bone in a pre-degenerated state, the method comprising:

determining reference information from a reference portion of a degenerated bone model representative of the at least a portion of the patient bone in a degenerated state; and

using the reference information to restore a degenerated portion of the degenerated bone model into a restored portion representative of the degenerated portion in the pre-degenerated state.

2. The method of claim 1, wherein the reference portion is associated with a portion of the degenerated bone model that represents a non-degenerated portion of the at least a portion of the patient bone.

3. The method of claim 2, wherein the reference information is associated with at least one image contour line associated with the reference portion.

4. The method of claim 3, wherein the at least one image contour line represents at least one of a bone contour line and a cartilage contour line.

5. The method of claim 3, wherein the at least one image contour line is obtained from at least one image generated via at least one of MRI and CT.

6. The method of claim 3, wherein the reference information includes at least one of ellipse, plane, vector, and line information associated with the at least one image contour line.

7. The method of claim 2, wherein the non-degenerated portion is associated with at least one of a femur condyle and a tibia plateau.

8. The method of claim 1, wherein the reference information includes vector information.

9. The method of claim 1, wherein using the reference information to restore a degenerated portion of the degenerated bone model into a restored portion representative of the degenerated portion in the pre-degenerated state includes using the reference information to modify at least one image contour line associated with the degenerated portion.

10. The method of claim 9, wherein the at least one image contour line represents at least one of a bone contour line and a cartilage contour line.

11. The method of claim 9, wherein the at least one image contour line represent a bone contour line.

12. The method of claim 9, wherein the at least one image contour line is obtained from at least one image generated via at least one of MRI and CT.

13. The method of claim 1, further comprising verifying the accuracy of the restored bone model.

14. The method of claim 13, wherein the accuracy of the restored bone model is acceptable if an axis extending along a trochlear groove of the restored bone model is equal to or less than approximately six degrees of being perpendicular with a line associated with a joint line associated with the restored bone model.

15. The method of claim 1, further comprising employing the restored bone model in defining manufacturing instructions for the manufacture of a customized arthroplasty jig.

16. A customized arthroplasty jig manufactured according to the method of claim 15.

17. The customized arthroplasty jig of claim 16, wherein the jig is configured to facilitate a prosthetic implant restoring a patient joint to a natural alignment.

18. The customized arthroplasty jig of claim 17, wherein the prosthetic implant is for a total joint replacement or partial joint replacement.

19. A method of generating a computerized bone model representative of at least a portion of a patient bone in a pre-degenerated state, the method comprising:

generating at least one image of the patient bone in a degenerated state;

identifying a reference portion associated with a generally non-degenerated portion of the patient bone;

identifying a degenerated portion associated with a generally degenerated portion of the patient bone; and

using information from at least one image associated with the reference portion to modify at least one aspect associated with at least one image associated with the generally degenerated portion.

20. The method of claim 19, wherein the at least one aspect includes at least one contour line.

21. The method of claim 20, wherein the at least one contour line represents a bone contour line.

22. The method of claim 20, wherein the at least one contour line represents at least one of a bone contour line and a cartilage contour line.

23. The method of claim 20, further comprising compiling into a resulting computerized bone model at least the following:

at least one contour line associated with at least one image associated with the generally non-degenerated portion; and

the modified at least one contour line associated with the at least one image associated with the generally degenerated portion.

24. The method of claim 23, wherein the resulting computerized bone model is the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state.

25. The method of claim 24, wherein the resulting computerized bone model represents bone only.

26. The method of claim 24, wherein the resulting computerized bone model represents at least one of bone and cartilage.

27. The method of claim 19, wherein the information includes at least one of ellipse information, line information, plane information, and vector information.

28. The method of claim 19, wherein the information includes vector information.

29. The method of claim 19, wherein the information is associated with at least one of a femur condyle and a tibia plateau.

30. The method of claim 19, wherein the images are generated via at least one of MRI and CT.

31. The method of claim 19, wherein the patient bone is at least one of a femur and a tibia.

32. The method of claim 19, further comprising verifying the accuracy of the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state.

33. The method of claim 32, wherein the accuracy of the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state is acceptable if an axis extending along a trochlear groove of the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state is equal to or less than approximately six degrees of being perpendicular with a line associated with a joint line associated with the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state.

34. The method of claim 19, further comprising employing the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state in defining manufacturing instructions for the manufacture of a customized arthroplasty jig.

35. A customized arthroplasty jig manufactured according to the method of claim 34.

36. The customized arthroplasty jig of claim 35, wherein the jig is configured to facilitate a prosthetic implant restoring a patient joint to a natural alignment.

37. The customized arthroplasty jig of claim 36, wherein the prosthetic implant is for a total joint replacement or partial joint replacement.

38. A method of generating a computerized bone model representative of at least a portion of a first patient bone in a pre-degenerated state, the method comprising:

generating at least one image of the first patient bone in a degenerated state;

identifying a reference portion associated with a generally non-degenerated portion of a second patient bone;

identifying a degenerated portion associated with a generally degenerated portion of the first patient bone; and

using information from at least one image associated with the reference portion to modify at least one aspect associated with at least one image associated the generally degenerated portion.

39. The method of claim 38, wherein the first patient bone is part of a first joint and the second patient bone is part of a second joint.

40. The method of claim 38, wherein the first patient bone and the second patient bone are part of the same joint.

41. The method of claim 38, wherein the at least one aspect includes at least one contour line.

42. The method of claim 41, wherein the at least one contour line represents a bone contour line.

43. The method of claim 41, wherein the at least one contour line represents at least one of a bone contour line and a cartilage contour line.

44. The method of claim 41, further comprising compiling into a resulting computerized bone model at least the following:

at least one contour line associated with at least one image associated with the generally non-degenerated portion; and

the modified at least one contour line associated with the at least one image associated with the generally degenerated portion.

45. The method of claim 44, wherein the resulting computerized bone model is the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state.

46. The method of claim 45, wherein the resulting computerized bone model represents bone only.

47. The method of claim 45, wherein the resulting computerized bone model represents at least one of bone and cartilage.

48. The method of claim 38, wherein the information includes at least one of ellipse information, circle information, line information, plane information, and vector information.

49. The method of claim 38, wherein the information includes vector information.

50. The method of claim 38, wherein the information is associated with at least one of a femur condyle and a tibia plateau.

51. The method of claim 38, wherein the images are generated via at least one of MRI and CT.

52. The method of claim 38, wherein the first patient bone is at least one of a femur and a tibia.

53. The method of claim 38, further comprising verifying the accuracy of the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state.

54. The method of claim 53, wherein the accuracy of the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state is acceptable if an axis extending along a trochlear groove of the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state is equal to or less than approximately six degrees of being perpendicular with a line associated with a joint line associated with the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state.

55. The method of claim 38, further comprising employing the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state in defining manufacturing instructions for the manufacture of a customized arthroplasty jig.

56. A customized arthroplasty jig manufactured according to the method of claim 55.

57. The customized arthroplasty jig of claim 56, wherein the jig is configured to facilitate a prosthetic implant restoring a patient joint to a natural alignment.

58. The customized arthroplasty jig of claim 57, wherein the prosthetic implant is for a total joint replacement or partial joint replacement.

59. A method of generating a computerized bone model representative of at least a portion of a first patient bone in a pre-degenerated state, wherein the first patient bone is part of a first patient joint, the method comprising:

identifying a second patient bone of a second joint, wherein the second bone is a generally symmetrical mirror image of the first patient bone;

generating a plurality of images of the second patient bone when the second patient bone is in a generally non-degenerated state;

mirroring the plurality of images to reverse the order of the plurality images; and

compiling the plurality of images in the reversed order to form the computerized bone model representative of the at least a portion of the first patient bone.

60. The method of claim 59, wherein the first and second joints are knee joints.

61. The method of claim 59, wherein the first and second joints are selected from the group consisting of knee joints, elbow joints, hip joints, wrist joints, shoulder joints, and ankle joints.

62. The method of claim 59, wherein the images are generated via at least one of MRI and CT.

63. The method of claim 59, further comprising employing the computerized bone model representative of the at least a portion of the first patient bone in the pre-degenerated state in defining manufacturing instructions for the manufacture of a customized arthroplasty jig.

64. A customized arthroplasty jig manufactured according to the method of claim 63.

65. The customized arthroplasty jig of claim 64, wherein the jig is configured to facilitate a prosthetic implant restoring a patient joint to a natural alignment.

66. The customized arthroplasty jig of claim 65, wherein the prosthetic implant is for a total joint replacement or partial joint replacement.