Systems and methods for providing an asymmetrical femoral component
View Patent ↗Systems and methods for providing deeper knee flexion capabilities. In some instances, such systems and methods include an asymmetrical femoral component that includes a femoral prosthesis that is configured to attach to a distal portion of a femur. In some such instances, the prosthesis includes a medial condyle and a lateral condyle, wherein a medial-lateral width of an articulation surface of the lateral condyle is approximately 75% or less of a medial-lateral width of an articulation surface of the medial condyle. Other implementations are also discussed.
1. An asymmetrical femoral component, comprising:
a femoral prosthesis configured to attach to a distal portion of a femur, the prosthesis comprising:
a medial condyle;
a lateral condyle; and
a patellar groove,
wherein a medial-lateral width of an articulation surface of the lateral condyle is approximately 75% or less of a medial-lateral width of an articulation surface of the medial condyle, and
wherein the patellar groove extends medially at an angle from a proximal anterior portion of the femoral prosthesis to a distal anterior portion of the femoral prosthesis and to a distal posterior portion of the femoral prosthesis.
2. The femoral component of claim 1 , wherein a proximal anterior end of the femoral prosthesis is configured to terminate within about 5 mm of a proximal end of an anterior oblique cut on the distal portion of the femur.
3. The femoral component of claim 2 , wherein a medial-lateral distance between a most lateral portion of femoral prosthesis and a center of the patellar groove in the prosthesis is approximately 75% or less than a medial-lateral distance between a most medial portion of the femoral prosthesis and the center of the patellar groove.
4. The femoral component of claim 1 , wherein the articulation surface of the medial condyle comprises a first curved shape having a first substantially constant radius, and wherein the articulation surface of the lateral condyle comprises a second curved shape having a second substantially constant radius.
5. The femoral component of claim 1 , wherein the articulation surface of the lateral condyle comprises a first curved shape having a first closing radius, and wherein the articulation surface of the medial condyle comprises a second curved shape having a second closing radius, wherein the first and second closing radii close posteriorly and anteriorly.
6. The femoral component of claim 1 , wherein the femoral prosthesis does not include an anterior flange as an integral part of the prosthesis.
7. The femoral component of claim 1 , wherein the medial-lateral width of the articulation surface of the lateral condyle is between about 30% and about 74% of the medial-lateral width of the articulation surface of the medial condyle.
8. The femoral component of claim 1 , wherein the prosthesis further comprises a proximal extension extending from a proximal, posterior portion of the femoral component, and wherein the proximal extension provides a concave articulation surface that is configured to articulate against the a portion of at least one of a tibia and a tibial component.
9. An asymmetrical femoral component, comprising:
a femoral prosthesis configured to attach to a distal portion of a femur, the prosthesis comprising:
a medial condyle;
a lateral condyle; and
a patellar groove,
wherein a medial-lateral width of an articulation surface of the lateral condyle is less than about 75% of a medial-lateral width of an articulation surface of the medial condyle,
wherein the patellar groove is lateralized to a center of a medial-lateral width of the femoral prosthesis, and
wherein the patellar groove extends medially at an angle from a proximal anterior portion of the femoral prosthesis to a distal anterior portion of the femoral prosthesis and to a distal posterior portion of the femoral prosthesis.
10. The femoral component of claim 9 , wherein the articulation surface of the medial condyle comprises a first curved shape having a first substantially constant radius, and wherein the articulation surface of the lateral condyle comprises a second curved shape having a second substantially constant radius.
11. The femoral component of claim 9 , wherein the articulation surface of the lateral condyle comprises a first curved shape having a first closing radius, and wherein the articulation surface of the medial condyle comprises a second curved shape having a second closing radius, wherein the first and second closing radii close posteriorly and anteriorly.
12. The femoral component of claim 9 , wherein the prosthesis further comprises a proximal extension extending from a proximal, posterior portion of the femoral component, and wherein the proximal extension provides a concave articulation surface that is configured to articulate against the a portion of a tibia.
13. The femoral component of claim 9 , wherein the patellar groove extends laterally at an angle of less than about 87 degrees from the distal anterior portion of the femoral prosthesis to the proximal anterior portion of the femoral prosthesis.
14. The femoral component of claim 9 , wherein a medial-lateral distance between a most lateral portion of femoral prosthesis and a center of the patellar groove is less than about 75% of a medial-lateral distance between a most medial portion of the femoral prosthesis and the center of the patellar groove.
15. A method of applying a femoral component to a femur of a patient, the method comprising:
providing a femoral prosthesis configured to attach to a distal portion of a femur, the prosthesis comprising a medial condyle, a lateral condyle, and a patellar groove, wherein a medial-lateral width of an articulation surface of the lateral condyle is less than about 75% of a medial-lateral width of an articulation surface of the medial condyle, and wherein the patellar groove extends medially at an angle from a proximal anterior portion of the femoral prosthesis to a distal anterior portion of the femoral prosthesis and to a distal posterior portion of the femoral prosthesis;
preparing the femur to receive the femoral component, including removing bone from the distal portion of the femur; and
seating the femoral component on the distal portion of the femur.
16. The method of claim 15 , wherein the femoral prosthesis further comprises a patellar groove that is lateralized to a center of a medial-lateral width of the femoral prosthesis.
17. The method of claim 15 , wherein the medial-lateral width of the articulation surface of the lateral condyle is between about 30% and about 74% of the medial-lateral width of the articulation surface of the medial condyle.
18. The method of claim 15 , wherein the patellar groove extends laterally at an angle of less than about 87 degrees from the distal anterior portion of the femoral prosthesis to the proximal anterior portion of the femoral prosthesis.
19. The method of claim 15 , wherein a proximal, posterior portion of the femoral prosthesis comprises a concave articulation that is configured to articulate against the a portion of a tibia.
20. The method of claim 15 , wherein a medial-lateral distance between a most lateral portion of femoral prosthesis and a center of the patellar groove is approximately 75% or less than a medial-lateral distance between a most medial portion of the femoral prosthesis and the center of the patellar groove.