Method and apparatus for manufacturing an implant
View Patent ↗An orthopedic device includes a femoral implant having a non-custom internal bone engagement surface. The femoral implant includes at least nine parameters adjusted preoperatively to correspond to a specific patient. The parameters can include patient-specific lengths, such as, for example, medial and lateral condyle widths and notch height, and patient-specific medial and lateral angles.
1. An orthopedic device manufacturing method comprising:
preparing pre-operatively a three-dimensional image of a patient's joint from imaging scans of the patient using computer modeling;
selecting pre-operatively a non-custom femoral implant closely matching the joint and having a plurality of planar surfaces corresponding to planned planar resections of a femoral bone of the joint, the planned resections including an anterior cut plane, anterior chamfer plane, distal cut plane, posterior chamfer plane and posterior cut plane;
manufacturing pre-operatively a customized femoral implant by a machining operation, the machining operation modifying at least six angles of the plurality of planar surfaces of the femoral implant to be patient-specific as determined from the three-dimensional image of the patient's joint, each patient-specific angle defined between a central plane perpendicular to a medial-lateral width of the femoral implant and lines connecting medial end points at medial edges between the planar resections and lateral points at lateral edges between the planar resections;
manufacturing a patient-specific femoral alignment guide;
coupling a removable tracking tag to the patient-specific femoral alignment guide for tracking the alignment guide from manufacture to surgery, the tracking tag including patient-specific information and configured to be removed prior to a corresponding surgical procedure; and
preparing a surgical kit including the femoral implant and a patient-specific alignment guide for the surgical procedure.
2. The method of claim 1 , wherein the six angles include three medial angles and three lateral angles of the implant.
3. The method of claim 1 , further comprising machining at least three lengths of the implant to be patient specific, as determined from the three-dimensional image of the patient's joint.
4. The method of claim 3 , wherein machining at least three lengths of the implant to be patient specific includes machining a medial condyle width of the femoral implant.
5. The method of claim 3 , wherein machining at least three lengths of the implant to be patient specific includes machining a lateral condyle width of the femoral implant.
6. The method of claim 3 , wherein machining at least three lengths of the implant to be patient specific includes machining a notch height width of the femoral implant.
7. The method of claim 1 , further comprising tracking the patient information from manufacture to implant procedure.
8. The method of claim 1 , wherein the surgical kit includes additional surgeon-selected instruments.
9. The method of claim 1 , wherein the surgical kit is designed to be disposable.
10. The method of claim 1 , wherein the tracking tag is inserted in a pocket formed in an extension of the alignment guide.
11. The method of claim 10 , wherein the extension is frangible.