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1. (WO2009029631) SYSTEMS AND METHODS FOR PROVIDING DEEPER KNEE FLEXION CAPABILITIES FOR KNEE PROSTHESIS PATIENTS
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1. A knee prosthesis comprising:
a femoral component for replacing at least a portion of a distal end of a femur comprising:
a medial femoral articular surface; and
a lateral femoral articular surface;
wherein at least one of the medial femoral articular surface and the lateral femoral articular surface extends in a proximal anterior direction on a corresponding posterior condyle of the femur at least half of the anteroposterior distance between a most posterior portion of the corresponding posterior condyle and a plane that is a continuation of a distal one fourth to one third of a posterior cortex of a femoral shaft of the femur.
2. A knee prosthesis as recited in claim 1 , wherein the at least one of the medial femoral articular surface and the lateral femoral articular surface extends in a proximal anterior direction on the corresponding posterior condyle at least two-thirds of the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane.
3. A knee prosthesis as recited in claim 1, wherein both of the medial femoral articular surface and the lateral femoral articular surface extend in a proximal anterior direction on their respective posterior condyles at least half of the antero-posterior distance between the most posterior portion of the corresponding posterior condyles and the plane.
4. A knee prosthesis as recited in claim 1, wherein the femoral component further comprises a modular attachment located between the femoral component and the femur, the modular attachment comprising an extension of at least one of the medial femoral articular surface and the lateral femoral articular surface, the extension providing the corresponding articular surface between substantially one-third the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane and at least half the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane.
5. A knee prosthesis as recited in claim 5, wherein the extensions provides the corresponding articular surface between substantially one-third the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane and at least two-thirds the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane.

6 A knee prosthesis as recited in claim 1 , wherein the femoral component is configured to be applied to the femur by initiating contact between the femoral component and the femur in a posterior region and by rotating or rolling the femoral component into place
7 A knee prosthesis as recited in claim 1 , further comprising:
a tibial component having a posterior surface and an antero-posteπor dimension comprising
a medial tibial articular surface comprising a curvature having a low point located between 18% and 30% of the antero-posteπor dimension from the posterior surface.
8. A knee prosthesis as recited in claim 7, wherein the tibial component further comprises
a lateral tibial articular surface that is substantially flat in the antero-posterior sense over at least two-thirds of the antero-posterior dimension, and that comprises an anterior lip that prevents a lateral femoral condyle from sliding off an anterior edge of the tibial component
9 A method of applying a femoral component to a femur of a patient, the method comprising
providing a femoral component having
a medial femoral articular surface; and
a lateral femoral articular surface,
wherein at least one of the medial femoral articular surface and the lateral femoral articular surface extends in a proximal anterior direction on a corresponding posterior condyle of a femur at least half of the antero-posterior distance between a most posterior portion of the corresponding posterior condyle and a plane that is a continuation of a distal one fourth to one third of a posterior cortex of a femoral shaft of the femur;
preparing the femur to receive the femoral component, including removing bone from a distal end of the femur,
positioning the femoral component adjacent the distal end of the femur, wherein the femoral component is in a rotated position such that an anterior portion of the femoral component is rotated distally and posteriorly from a normal use position of the anterior portion,
positioning the femoral component such that a posterior portion of the femoral component contacts a posterior portion of the distal end of the femur: and rotating the femoral component until the anterior portion of the femoral component seats against an anterior portion of the distal end of the femur
10. A method of applying a femoral component to a femur of a patient, the method comprising
providing a femoral component having
a medial femoral articular surface; and
a lateral femoral articular surface;
wherein at least one of the medial femoral articular surface and the lateral femoral articular surface extends in a proximal anterior direction on a corresponding posterior condyle of a femur at least half of the antero-posterior distance between a most posterior portion of the corresponding posterior condyle and a plane that is a continuation of a distal one fourth to one third of a posterior cortex of a femoral shaft of the femur,
preparing the femur to receive the femoral component, including removing bone from a distal end of the femur;
positioning the femoral component adjacent the distal end of the femur, wherein the femoral component is in a rotated position such that an anterior portion of the femoral component is rotated distally and posteπoi ly from a normal use position of the anterior portion,
positioning the femoral component such that a posterior portion of the femoral component contacts a posterior portion of the distal end of the femur, and
rotating the femoral component until the anterior portion of the femoral component seats against an anterior portion of the distal end of the femur
1 1. The method of claim 9, further comprising attaching the femoral component to the distal end of the femur
12 The method of claim 9, wherein the femoral component comprises a modular attachment wherein the femoral component further comprises a modular attachment, the modular attachment comprising an extension of at least one of the medial femoral articular surface and the lateral femoral articular surface, the extension providing the corresponding articular surface between substantially one-third the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane and at least half the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane, the method further comprising' attaching the modular attachment to the distal end of the femur before positioning the femoral component adjacent the distal end of the femur.
13. The method of claim 1 1, further comprising attaching the femoral component to the modular attachment and to the distal end of the femur.
14. The method of claim 9, wherein the femoral component comprises a modular attachment wherein the femoral component further comprises a modular attachment, the modular attachment comprising an extension of at least one of the medial femoral articular surface and the lateral femoral articular surface, the extension providing the corresponding articular surface between substantially one-third the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane and at least half the antero-posterior distance between the most posterior portion of the corresponding posterior condyle and the plane, the method further comprising:
attaching the modular attachment to the femoral component before positioning the femoral component adjacent the distal end of the femur.
15. The method of claim 13, further comprising attaching the femoral component, including the modular attachment, to the distal end of the femur. \
16. A knee prosthesis comprising:
a tibial component having a posterior surface and an antero-posterior dimension comprisinga medial articular surface comprising a curvature having a low point located between 18% and 30% of the antero-posterior dimension from the posterior surface.
17. A knee prosthesis as recited in claim 15, wherein the tibial component further comprises:
a lateral tibial articular surface that is substantially flat in the antero-posterior sense over at least two-thirds of the antero-posterior dimension, and that comprises an anterior lip that prevents a lateral femoral condyle from sliding off an anterior edge of the tibial component.
18. A knee prosthesis as recited in claim 16, wherein the lateral tibial articular surface further comprises a posterior lip.
19. A knee prosthesis as recited in claim 16, wherein the lateral tibial articular surface is substantially flat when viewed in a frontal plane.
20. A knee prosthesis as recited in claim 16, wherein the lateral tibial articular surface is concave when viewed in a frontal plane, and has a radius of curvature greater than or equal to a radius of curvature of a lateral femoral condyle when viewed in the frontal plane.
21. A knee prosthesis as recited in claim 15, further comprising:
a femoral component for replacing at least a portion of a distal end of a femur comprising:
a medial femoral articular surface; and
a lateral femoral articular surface;
wherein at least one of the medial femoral articular surface and the lateral femoral articular surface extends in a proximal anterior direction on a corresponding posterior condyle of the femur at least half of the anteroposterior distance between a most posterior portion of the corresponding posterior condyle and a plane that is a continuation of a distal one fourth to one third of a posterior cortex of a femoral shaft of the femur.
22. A knee prosthesis as recited in claim 17, wherein the posterior lip is extended posteriorly and is contoured to seat within a concave, resectioned portion of a popliteal surface of the femur so as to be interposed between the lateral tibial articular surface and the resectioned portion of the popliteal surface.
23. A knee prosthesis comprising
a femoral component comprising
a medial femoral articular surface; and
a lateral femoral articular surface, wherein the lateral femoral articular surface has a medial-lateral width of a most distal portion of the lateral femoral articular surface less than 75% of a medial-lateral width of a most distal portion of the medial femoral articular surface.
24. A knee prosthesis as recited in claim 22, wherein the medial-lateral width of the most distal portion of the lateral femoral articular surface is less than 70% of the medial-lateral width of the most distal portion of the medial femoral articular surface.

25. A knee prosthesis as recited in claim 22, further comprising a patellar groove between the medial femoral articular surface and the lateral femoral articular surface, wherein the patellar groove is lateral from a medial-lateral center of the femoral component.
26. A knee prosthesis as recited in claim 24, wherein the patellar groove is angled in a lateral to medial direction when followed from a most proximal anterior position on the femoral component to a most distal position on the femoral component and to a most proximal posterior position on the femoral component.

27. A knee prosthesis as recited in claim 22, wherein the medial femoral articular surface and the lateral femoral articular surface have a closing radius in the proximal posterior portion.