Generation of a computerized bone model representative of a pre-degenerated state and useable in the design and manufacture of arthroplasty devices

• US 8,480,679 B2
• Filed: 04/29/2008
• Issued: 07/09/2013
• 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, Chi, Charlie W., Howell, Stephen M.
• Primary Examiner(s): Truong, Kevin T
• Assistant Examiner(s): Bates, David
• Application Number:
  US12/111,924
• Publication Number:
  US 20090270868A1
• Time in Patent Office: 1,897 Days
• Field of Search: 606/87
• 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 utilizing a computer processing device to perform the operations of:

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;

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; and

verifying the accuracy of the restored bone model, wherein the accuracy of the restored bone model is acceptable if an axis extending along a trochlear groove of the restored bone model is within a range that is less than or equal to approximately six degrees of being perpendicular with a joint line extending across most distal contact points of a medial femoral condyle and a lateral femoral condyle, the joint line associated with the restored bone model.

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 employing the restored bone model in defining manufacturing instructions for the manufacture of a customized arthroplasty jig.

14. 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;

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; and

verifying the accuracy of the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state, 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 within a range that is less than or equal to approximately six degrees of being perpendicular with a joint line extending across most distal contact points of a medial femoral condyle and a lateral femoral condyle, the joint line associated with the computerized bone model representative of the at least a portion of the patient bone in the pre-degenerated state.

15. The method of claim 14, wherein the at least one aspect includes at least one contour line.

16. The method of claim 15, wherein the at least one contour line represents a bone contour line.

17. The method of claim 15, wherein the at least one contour line represents at least one of a bone contour line and a cartilage contour line.

18. The method of claim 15, 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.

19. The method of claim 18, 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.

20. The method of claim 19, wherein the resulting computerized bone model represents bone only.

21. The method of claim 19, wherein the resulting computerized bone model represents at least one of bone and cartilage.

22. The method of claim 14, wherein the information includes at least one of ellipse information, line information, plane information, and vector information.

23. The method of claim 14, wherein the information includes vector information.

24. The method of claim 14, wherein the information is associated with at least one of a femur condyle and a tibia plateau.

25. The method of claim 14, wherein the images are generated via at least one of MRI and CT.

26. The method of claim 14, wherein the patient bone is at least one of a femur and a tibia.

27. The method of claim 14, 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.