METHOD OF MANUFACTURING AN ARTHROPLASTY JIG

摘要

A method and system for performing a total joint arthroplasty procedure on a patient's damaged bone region. A CT image or other suitable image is formed of the damaged bone surfaces, and location coordinate values (xn,yn,zn) are determined for a selected sequence of bone surface locations using the CT image data. A mathematical model z=f(x,y) of a surface that accurately matches the bone surface coordinates at the selected bone spice locations, or matches surface normal vector components at selected bone surface locations, is determined. The model provides a production file from which a cutting jig and an implant device (optional), each patient-specific and having controllable alignment, are fabricated for the damaged bone by automated processing. At this point, the patient is cut open (once), the cutting jig and a cutting instrument are used to remove a selected portion of the bone and to provide an exposed planar surface, the implant device is optionally secured to and aligned with the remainder of the bone, and the patient's incision is promptly repaired.

主权项

1. A method of manufacturing an arthroplasty jig configured to facilitate an arthroplasty procedure on a femur of a patient, the method comprising:
a) generating via at least one computer a three dimensional computer bone model from medical images of at least a distal region of the femur, wherein the three dimensional computer bone model represents at least a non-resected portion of the at least a distal region of the femur; b) preoperatively planning the arthroplasty procedure via the at least one computer, wherein the preoperative planning plans a postoperative position and alignment of an implant of the arthroplasty procedure, the preoperative planning comprising: superimposing a representation of the implant and the three dimensional computer bone model; and c) generating via the at least one computer a production file based upon the preoperative planning of step b), wherein the production file comprises instructions to create the arthroplasty jig to comprise a mating surface and a cutting instrument guide, wherein the mating surface comprises a surface profile that matches a surface profile of the at least a non-resected portion of the at least a distal region of the femur, the cutting instrument guide corresponds to a distal femoral resection plane, and the arthroplasty jig is configured such that, when the mating surface matingly engages the at least a non-resected portion of the at least a distal region of the femur in a single relative position, the cutting instrument guide is oriented to facilitate a bone resection in the at least a distal region of the femur that is perpendicular to a preoperatively selected axis associated with the femur.