Systems and methods for providing a femoral component with a modified posterior condyle
Systems and methods for providing deeper knee flexion capabilities. In some instances, such systems and methods include a knee prosthesis that includes a femoral component for replacing at least a portion of a distal end of a femur. In some cases, the femoral component has a posterior condyle that is configured to articulate against a tibial articular surface. In such cases, an articular surface at a proximal portion of the posterior condyle is sized and shaped to extend at least half of an antero-posterior distance between a most posterior portion of the 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. Other implementations are also discussed.
1. A femoral component comprising:
a portion of a first posterior condyle,
a first interior surface configured to face a first resected surface of a distal end of a femur, and
a first projection providing a first articular surface at a proximal part of the portion of the first posterior condyle.
2. The component of claim 1 , wherein the first articular surface of the first projection comprises a recessed articulation surface that is configured to articulate against at least one of a tibia and a tibial component.
3. The component of claim 1 , wherein the first projection comprises a modular component that is configured to couple to the femoral component.
4. The component of claim 1 , wherein the first projection is configured to contact a posterior surface of a femoral shaft of the femur when the femoral component is seated on the femur.
5. The component of claim 1 , wherein a proximal, anterior end of the femoral component is configured to terminate within about 10 mm of a proximal, anterior end of an anterior chamfer cut when the femoral component is seated on the femur.
6. The component of claim 1 , wherein the first projection comprises a flanged member that extends anteriorly from the first interior surface.
7. The component of claim 1 , wherein the portion of the first posterior condyle comprises a portion of a medial posterior condyle, and wherein the first articular surface of the first projection comprises an incurved articulation surface that is configured to articulate against at least one of a tibia and a tibial component.
8. The component of claim 1 , wherein the portion of the first posterior condyle comprises a portion of a lateral posterior condyle, and wherein the first articular surface of the first projection comprises a recessed articulation surface that is configured to articulate against at least one of a tibia and a tibial component.
9. The component of claim 7 , wherein the femoral component further comprises:
a portion of a lateral posterior condyle;
a second interior surface configured to face a second resected surface of the distal end of the femur; and
a second projection providing a second articular surface at a proximal part of the portion of the lateral posterior condyle.
10. A femoral component comprising:
a portion of a medial posterior condyle;
a first interior surface of the portion of the medial posterior condyle, the first interior surface configured to face a medial resected surface of a distal end of a femur; and
a first projection providing a first articular surface at a proximal part of the portion of the medial posterior condyle, with at least a portion of the first projection extending anteriorly past a portion of the first interior surface.
11. The component of claim 10 , wherein the first articular surface of the first projection comprises an incurved articulation surface that is configured to articulate against at least one of a tibia and a tibial component.
12. The component of claim 10 , wherein the first projection is coupled to a modular component that couples to the femoral component.
13. The component of claim 10 , wherein a portion of the first projection is configured to extend to a posterior surface of a femoral shaft of the femur when the femoral component is seated on the femur.
14. The component of claim 10 , wherein a portion of the first projection is configured to at least one of: (i) replace and (ii) extend over a popliteal surface of the femur.
15. The component of claim 10 , wherein a proximal, anterior end of the femoral component is configured to terminate within about 6 mm of a proximal, anterior end of an anterior chamfer cut when the femoral component is seated on the femur.
16. The component of claim 10 , wherein the femoral component further comprises:
a portion of a lateral posterior condyle;
a second interior surface of the portion of the lateral posterior condyle, the second interior surface configured to face a lateral resected surface of the distal end of the femur; and
a second projection providing a second articular surface at a proximal part of the portion of the lateral posterior condyle, at least a portion of the first projection extending anteriorly past a portion of the second interior surface.
17. The component of claim 16 , wherein the second articular surface of the second projection comprises an incurved articulation surface that is configured to articulate against at least one of a tibia and a tibial component.
18. A method for implanting a femoral component on a femur, the method comprising:
obtaining a femoral component comprising:
a portion of a first posterior condyle,
a first interior surface configured to face a first resected surface of a distal end of a femur, and
a first projection providing a first articular surface at a proximal part of the portion of the first posterior condyle;
removing bone from the distal end of the femur; and
attaching the femoral component to the distal end of the femur.
19. The method of claim 18 , further comprising resecting bone from a popliteal surface of the femur and using the femoral component to replace the popliteal surface.
20. The method of claim 18 , wherein the portion of the first posterior condyle comprises a portion of a medial posterior condyle, and wherein the first articular surface of the first projection comprises a recessed articulation surface that is configured to articulate against at least one of a tibia and a tibial component.