Method for Selecting a Standard Knee Implant with Asymmetric Femoral Component
Methods and devices are disclosed relating improved articular models, implant components, and related guide tools and procedures. In addition, methods and devices are disclosed relating articular models, implant components, and/or related guide tools and procedures that include one or more features derived from patient-data, for example, images of the patient's joint. The data can be used to create a model for analyzing a patient's joint and to devise and evaluate a course of corrective action. The data also can be used to create patient-adapted implant components and related tools and procedures.
1 . A method for selecting a knee replacement implant based on image data of a patient, comprising:
creating a two-dimensional or three-dimensional electronic model of a knee joint based at least in part on image data associated with the joint;
identifying the location of soft tissue associated with the knee joint; and
selecting an implant for implantation in the patient based at least in part on the dimensions of the implant in relative to the identified soft tissue.
2 . The method of claim 1 , further comprising planning a position and/or orientation of the implant for use during implantation of the implant in the patient and based at least in part of the electronic model of the knee joint.
3 . The method of claim 2 , wherein the implant includes a femoral condylar component having a lateral condylar portion that has a posterior taper such that the width of the lateral condylar portion measured in substantially the mediolateral direction narrows in a posterior part of the lateral condylar portion.
4 . The method of claim 3 , wherein the implant is selected such that the posterior taper of the lateral condylar portion of the femoral condylar component corresponds to and is planned to avoid a popliteus tendon of the patient when the implant is implanted in the patient.
5 . The method of claim 4 , wherein the implant includes an anterior flange and wherein the implant is selected such that the anterior flange on a lateral side of the femoral condylar component corresponds to and avoids a popliteus tendon of the patient when the implant is implanted in the patient.
6 . The method of claim 1 , wherein the implant includes a femoral condylar component having one or more features designed to avoid impingement with soft tissue, and wherein the implant is selected to avoid impingement with soft tissue based at least in part on the one or more features.
7 . The method of claim 1 , wherein the implant includes a tibial component having one or more features designed to avoid impingement with soft tissue, and wherein the implant is selected to avoid impingement with soft tissue based at least in part on the one or more features.
8 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to maximize coverage of a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
9 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to extend to cortical margins of a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
10 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to maximize coverage of a medial compartment of a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
11 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to minimize overhang relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
12 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to set rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
13 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to avoid internal rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
14 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to avoid excessive external rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
15 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to set rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient to avoid overhang of the implant.
16 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to set rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient to avoid impingement of the implant on one or more soft tissues of the patient.
17 . The method of claim 7 , further comprising planning a position or orientation of the tibial component to set rotation of the tibial component relative to a proximal end of a tibia of the patient when the tibial component is implanted in the patient to avoid impingement of the implant on the popliteus tendon of the patient.
18 . A method for selecting a knee replacement implant based on image data of a patient, comprising:
creating a two-dimensional or three-dimensional electronic model of a knee joint based at least in part on image data associated with the joint;
planning a position and/or orientation of the implant for use during implantation of the implant in the patient and based at least in part of the electronic model of the knee joint, wherein the position and/or orientation of the implant is selected to avoid impingement with one or more soft tissues of the knee joint based at least in part on a design feature of the implant.
19 . The method of claim 18 , wherein the implant includes a femoral condylar component having a lateral condylar portion that has at least one of a taper, divot or concavity such that the width of the lateral condylar portion measured in substantially the mediolateral direction narrows in a posterior part of the lateral condylar portion to accommodate a popliteus tendon when the implant is implanted in the patient, and wherein the design feature it the at least one of a taper, divot or concavity.
20 . The method of claim 18 , wherein the implant includes an anterior flange and wherein the implant is selected such that the anterior flange of the femoral condylar component avoids impinging a soft tissue of the patient when the implant is implanted in the patient.
21 . The method of claim 18 , wherein the implant includes a tibial component having one or more features designed to avoid impingement with soft tissue, and wherein the implant is selected to avoid impingement with soft tissue based at least in part on the one or more features.
22 . The method of claim 21 , further comprising planning a position or orientation of the tibial component to maximize coverage of a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
23 . The method of claim 21 , further comprising planning a position or orientation of the tibial component to extend to cortical margins of a proximal end of a tibia of the patient when the tibial component is implanted in the patient.
24 . A method for selecting a knee replacement implant based on image data of a patient, comprising:
creating a two-dimensional or three-dimensional electronic model of a knee joint based at least in part on image data associated with the joint;
identifying the location of soft tissue associated with the knee joint;
selecting an implant for implantation in the patient based at least in part on the dimensions of the implant in relative to the identified soft tissue; and
planning a position and/or orientation of the implant for use during implantation of the implant in the patient and based at least in part of the electronic model of the knee joint.
25 . The method of claim 24 , wherein the implant includes a femoral condylar component having a lateral condylar portion that has a posterior taper such that the width of the lateral condylar portion measured in substantially the mediolateral direction narrows in a posterior part of the lateral condylar portion.
26 . The method of claim 25 , wherein the implant is selected such that the posterior taper of the lateral condylar portion of the femoral condylar component corresponds to and is selected to avoid a popliteus tendon of the patient when the implant is implanted in the patient.
27 . The method of claim 26 , wherein the implant includes an anterior flange and wherein the implant is selected such that the anterior flange of the femoral condylar component corresponds to and avoids a popliteus tendon of the patient when the implant is implanted in the patient.
28 . The method of claim 24 , wherein the implant includes a femoral condylar component having one or more features designed to avoid impingement with soft tissue, and wherein the implant is selected to avoid impingement with soft tissue based at least in part on the one or more features.
29 . The method of claim 24 , wherein the implant includes a tibial component having one or more features designed to avoid impingement with soft tissue, and wherein the implant is selected to avoid impingement with soft tissue based at least in part on the one or more features.
30 . A method for selecting a knee replacement implant for implantation in a patient, comprising:
identifying the location of soft tissue associated with the knee joint;
selecting an implant for implantation in the patient based at least in part on the dimensions of the implant in relative to the identified soft tissue;
wherein the implant includes a femoral condylar component having a lateral condylar portion that has at least one of a posterior taper, divot, concavity or relief such that the width of the lateral condylar portion measured in substantially the mediolateral direction narrows in a posterior part of the lateral condylar portion, and further wherein the narrowed posterior part of the lateral condylar portion is selected to correspond to and be positioned to avoid a popliteus tendon of the patient when the implant is implanted in the patient.