Patient-adapted and improved articular implants, designs and related guide tools
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 femoral implant for replacing a knee joint of a patient comprising:
a. a medial condyle having a medial articular surface that includes a medial sagittal curve derived from a corresponding medial condyle of the knee joint of the patient;
b. a lateral condyle having a lateral articular surface that includes a lateral sagittal curve derived from a corresponding lateral condyle of the knee joint of the patient; and
c. a trochlear portion having a trochlear articular surface that includes a trochlear sagittal curve derived from the trochlear region of the knee joint of the patient; and
d. one or more additional implant features or measurements including one or more planar facets on the bone-facing surface of the femoral implant being derived from patient-specific data and a weighting of at least one parameter including preservation of bone,
wherein the medial, lateral and trochlear sagittal curves are substantially J-curves derived from the corresponding, respective medial, lateral and trochlear J-curves of the knee joint of patient.
2. The femoral implant of claim 1 , wherein the one or more planar facets are adapted to maximize bone preservation for the particular patient.
3. The femoral implant of claim 1 , wherein the one or more additional features or measurements include a medial or lateral condylar width of the implant being derived from patient-specific data and adapted to substantially match a corresponding width of a medial or lateral condyle of the knee joint of the patient, or a predetermined percentage thereof.
4. The femoral implant of claim 1 , wherein the one or more additional features or measurements include a distance between medial and lateral condyles on the implant being derived from patient-specific data and adapted to substantially match a corresponding distance between the medial and lateral femoral condyles of the knee joint of the patient, or a predetermined percentage thereof.
5. The femoral implant of claim 1 , wherein the one or more additional features or measurements includes a thickness of the implant from the bone-facing surface to the articular surface being derived from patient-specific data and adapted to substantially match a corresponding thickness from a corresponding planned resection cut surface to a corresponding articular surface on the patient's femur, or a predetermined percentage thereof.
6. The femoral implant of claim 1 , wherein the one or more additional features or measurements includes a cross-sectional perimeter shape of the implant being derived from patient-specific data and adapted to substantially match a corresponding cross-sectional perimeter shape of the patient's femur, or a predetermined percentage thereof.
7. The femoral implant of claim 1 , wherein the one or more additional features or measurements includes a volume of a portion of the implant derived from patient-specific data and adapted to substantially match a corresponding volume of a portion of the patient's femur, or a predetermined percentage thereof.
8. The femoral implant of claim 1 , wherein the at least one parameter includes preservation of joint kinematics.