Patient-Specific Pre-Operative Planning

• US 20110092804A1
• Filed: 12/20/2010
• Published: 04/21/2011
• Est. Priority Date: 02/27/2006
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Morrison, Bryan, Schoenefeld, Ryan J., Metzger, Robert, Uthgenannt, Brian A.
• Granted Patent: US 9,345,548 B2
• Time in Patent Office: Days
• US Class Current: 600/416
• CPC Class Codes: A61B 17/151 for corrective osteotomy
• CPC Class Codes: A61B 17/152 for removing a wedge-shaped piece of bone
• 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 2034/252 indicating steps of a surgical procedure
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61F 2/4607 of hip femoral endoprostheses
• CPC Class Codes: A61F 2002/30617 Visible markings for adjusting, locating or measuring
• CPC Class Codes: A61F 2002/4633 for selection of endoprosthetic joints or for pre-operative planning
• CPC Class Codes: A61F 2002/4662 for measuring penetration depth
• CPC Class Codes: A61F 2002/4668 for measuring angles
• CPC Class Codes: A61F 2002/4687 Mechanical guides for implantation instruments
• CPC Class Codes: A61F 2250/0097 Visible markings, e.g. indicia
• CPC Class Codes: G06T 2207/20101 Interactive definition of point of interest, landmark or seed
• CPC Class Codes: G06T 2207/30008 Bone
• CPC Class Codes: G06T 2207/30172 Centreline of tubular or elongated structure
• CPC Class Codes: G06T 7/0014 using an image reference approach
• CPC Class Codes: G06T 7/66 of image moments or centre of gravity
• CPC Class Codes: G06T 7/73 using feature-based methods
• CPC Class Codes: G06T 7/75 involving models

Abstract

A method for pre-operative orthopedic planning includes obtaining only a high-resolution knee-joint scan of a patient, determining hip rotation center and ankle rotation center from anthropometric data based on personal data of the patient, and determining a mechanical axis of the knee joint based on the anthropometric data. The method also includes preparing at least a two-dimensional image model of the knee joint using the knee-joint scan and the determined mechanical axis, and preparing a pre-operative surgical plan based on the image of the knee joint.

Claims

1. A method for pre-operative orthopedic planning comprising:

obtaining only a high-resolution knee-joint scan of a patient;

determining hip rotation center and ankle rotation center from anthropometric data based on personal data of the patient;

determining a mechanical axis of the knee joint based on the anthropometric data;

preparing at least a two-dimensional image model of the knee joint using the knee-joint scan and the determined mechanical axis; and

preparing a pre-operative surgical plan based on the image of the knee joint.

2. The method of claim 1, wherein the high-resolution scan is one of Magnetic Resonance Imaging or Computer Tomography scan.

3. The method of claim 1, wherein the personal data include a height of the patient.

4. The method of claim 2, wherein the personal data include gender, age and weight of the patient.

5. The method of claim 1, wherein preparing a pre-operative surgical plan further comprises preparing a patient-specific alignment guide.

6. The method of claim 5, wherein preparing a pre-operative surgical plan further comprises selecting an implant for the patient.

7. The method of claim 6, wherein the implant is patient-specific.

8. The method of claim 1, wherein preparing at least a two-dimensional image model of the knee joint includes preparing a three-dimensional image model of the knee joint.

9. A method for pre-operative orthopedic planning comprising:

obtaining only a high-resolution knee-joint scan of a patient;

taking a digital photographic image of the patient;

determining a hip rotation center and an ankle rotation center from the digital photographic image;

determining a mechanical axis of the knee joint based on the knee-joint scan and the hip rotation center and ankle rotation center;

preparing an at least two-dimensional image model of the knee joint using the knee-joint scan and the determined mechanical axis; and

preparing a pre-operative surgical plan based on the image model of the knee joint.

10. The method of claim 9, wherein preparing a pre-operative surgical plan further comprises preparing a patient-specific alignment guide.

11. The method of claim 10, wherein preparing a pre-operative surgical plan further comprises selecting an implant for the patient.

12. The method of claim 11, wherein the implant is patient-specific.

13. The method of claim 9, wherein the digital image of the patient is taken against a grid surface.

14. A method for pre-operative orthopedic planning comprising:

creating a diseased bone database;

obtaining personal data of a patient;

selecting a best-fit bone model from the diseased bone database based on the personal data of the patient;

transforming the best fit model to a customized model matching the personal data of the patient; and

preparing a pre-operative surgical plan based on the customized model without obtaining image data of the patient.

15. The method of claim 14, wherein obtaining personal data of a patient includes obtaining age, gender, weight and height of the patient.

16. The method of claim 15, wherein transforming the best fit model to a customized model matching the personal data of the patient includes transforming the best-fit model to match a hip height of the patient.

17. The method of claim 15, wherein transforming the best fit model to a model matching the personal data of the patient includes transforming the best-fit model to match a tibial height of the patient.

18. The method of claim 15, wherein transforming the best fit model to a model matching the personal data of the patient includes transforming the best-fit model to match a hip angle of the patient.

19. The method of claim 15, wherein transforming the best fit model to a model matching the personal data of the patient includes transforming the best-fit model to match a tibial angle of the patient.

20. The method of claim 14, wherein preparing a pre-operative surgical plan further comprises preparing a customized alignment guide based on the customized model.

21. The method of claim 14, wherein preparing a pre-operative surgical plan further comprises selecting an implant for the patient.

22. The method of claim 21, wherein the implant is selected from a customized or semi-customized or non-customized model.