Granted Patent B2

US 8,715,360 · App. 13/831,352 · Granted May 6, 2014

Inventors: Kent M. Samuelson (Salt Lake City, UT); Connor E. Samuelson (Salt Lake City, UT)

Abstract

Claims (31)

1. A tibial component, comprising:

an asymmetrical articular plateau comprising:

a medial tibial condylar surface; and

a lateral tibial condylar surface,

wherein at least one of the medial condylar surface and the lateral condylar surface comprises a concave articulation surface having a fixed center of rotation with a lowest point disposed from a posterior edge of the tibial component by between about 18% and less than about 35% of a total anteroposterior dimension of the tibial component.

2. The tibial component of claim 1 , wherein the concave articulation surface having the fixed center of rotation is disposed in the medial condylar surface.

3. The tibial component of claim 1 , wherein the concave articulation surface having the fixed center of rotation is disposed in the lateral condylar surface.

4. The tibial component of claim 1 , wherein the at least one of the medial condylar surface and the lateral condylar surface further comprises a substantially flat articulation surface having a length that extends in an anteroposterior direction.

5. The tibial component of claim 4 , wherein the lateral condylar surface comprises the substantially flat articulation surface.

6. The tibial component of claim 4 , wherein the substantially flat articulation surface extends between about two-thirds and about seven-eighths of the total anteroposterior dimension of the tibial component.

7. The tibial component of claim 4 , wherein the substantially flat articulation surface comprises a substantially flat profile when viewed from a frontal plane.

8. The tibial component of claim 1 , further comprising a raised tibial full flex articulation surface disposed at a posterior portion of the tibial component, wherein the tibial full flex articulation raises from a single surface selected from the medial tibial condylar surface and the lateral tibial condylar surface.

9. The tibial component of claim 1 , further comprising a stem extending from an undersurface of the tibial component, wherein the stem is configured to contact an inner, anterior surface of a tibia when the stem is inserted into the tibia and the undersurface of the tibial component is in contact with a cut surface of the tibia.

10. A tibial component, comprising:

an asymmetrical articular plateau comprising:

a medial tibial condylar surface comprising a concave articulation surface having a fixed center of rotation with a lowest point disposed from a posterior edge of the tibial component by between about 18% and less than about 35% of a total anteroposterior dimension of the tibial component; and

a lateral tibial condylar surface comprising a substantially flat articulation surface having a length that extends in an anteroposterior direction.

11. The tibial component of claim 10 , wherein the substantially flat articulation surface extends between about two-thirds and about seven-eighths of the total anteroposterior dimension of the tibial component.

12. The tibial component of claim 10 , wherein the substantially flat articulation surface comprises a concave profile when viewed from a frontal plane.

13. The tibial component of claim 10 , wherein the tibial component comprises a raised lip at a posterior end of the substantially flat articulation surface.

14. The tibial component of claim 10 , wherein the concave articulation surface of the medial condylar surface extends as a substantially smooth arc to a raised lip disposed at a posterior edge of the tibial component.

15. The tibial component of claim 10 , further comprising a posterior lip that rises between about 0.5 mm and about 8 mm above the lowest point of the concave articulation surface.

16. A method for applying a tibial component to a tibia of a patient, the method comprising:

preparing the tibia to receive the tibial component by removing bone from a proximal end of the tibia;

providing the tibial component, wherein the tibial component comprises an asymmetrical articular plateau comprising a medial tibial condylar surface, and a lateral tibial condylar surface, wherein at least one of the medial condylar surface and the lateral condylar surface comprises a concave articulation surface having a fixed center of rotation with a lowest point disposed from a posterior edge of the tibial component by between about 18% and less than about 35% of a total anteroposterior dimension of the tibial component; and

attaching the tibial component to the proximal end of the tibia.

17. The method of claim 16 , further comprising placing the tibial component in contact with an articular surface of the femur such that at least one of a medial condyle and a lateral condyle of the femur's articular surface is rotatable about the fixed center of rotation of the concave articulation surface.

18. The method of claim 16 , wherein the medial condylar surface comprises the concave articulation surface comprising the fixed center of rotation.

19. The method of claim 16 , wherein the lateral condylar surface comprises a substantially flat articulation surface that extends in an anteroposterior direction, and wherein the method further comprises placing the tibial component in contact with a lateral condyle of a femur such that the lateral condyle is able to slide anteriorly and posteriorly with respect to the lateral tibial condylar surface.

20. The method of claim 19 , wherein the substantially flat articulation surface extends between about two-thirds and about seven-eighths of the total anteroposterior dimension of the tibial component.

21. The method of claim 19 , wherein the tibial component further comprises a lip at both a posterior end and an anterior end of the substantially flat articulation surface.

Continuity (8)