High performance knee prostheses
First Claim
1. A prosthesis for replacement of a least part of a knee joint in a leg, the leg including a femur and a tibia, the prosthesis comprising:
- a femoral component adapted to fit on a distal end of the femur, the femoral component comprising;
a lateral condylar structure defining a lateral condylar bearing surface; and
a medial condylar structure defining a medial condylar bearing surface;
a tibial component adapted to fit on a proximal end of the tibia, the tibial component comprising;
a medial portion comprising a medial bearing surface configured to articulate with the medial condylar bearing surface when the prosthesis is installed and a lateral portion comprising a lateral bearing surface configured to articulate with the lateral condylar bearing surface when the prosthesis is installed, wherein;
the medial bearing surface comprises an anterior-most edge and a posterior-most edge;
the lateral bearing surface comprises an anterior-most edge and a posterior-most edge;
the medial bearing surface has a minimum thickness that is thicker in a superior-inferior direction at the medial bearing surface posterior-most edge than a minimum thickness of the lateral bearing surface at the lateral bearing surface posterior-most edge; and
the medial bearing surface has a minimum thickness that is thinner in a superior-inferior direction at the medial bearing surface anterior-most edge than a minimum thickness of the lateral bearing surface at the lateral bearing surface anterior-most edge.
2 Assignments
0 Petitions
Accused Products
Abstract
Knee prostheses that more faithfully replicate the structure and function of the human knee joint in order to provide, among other benefits: greater flexion of the knee in a more natural way by promoting or accommodating internal tibial rotation, replication of the natural screw home mechanism, and controlled articulation of the tibia and femur respective to each other in a natural way. Such prostheses may include an insert component disposed between a femoral component and a tibial component, the insert component featuring, among other things, a reversely contoured posterolateral bearing surface that helps impart internal rotation to the tibia as the knee flexes. Other surfaces can be shaped using iterative automated techniques that allow testing and iterative design taking into account a manageable set of major forces acting on the knee during normal functioning, together with information that is known about natural knee joint kinetics and kinematics.
354 Citations
19 Claims
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1. A prosthesis for replacement of a least part of a knee joint in a leg, the leg including a femur and a tibia, the prosthesis comprising:
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a femoral component adapted to fit on a distal end of the femur, the femoral component comprising; a lateral condylar structure defining a lateral condylar bearing surface; and a medial condylar structure defining a medial condylar bearing surface; a tibial component adapted to fit on a proximal end of the tibia, the tibial component comprising; a medial portion comprising a medial bearing surface configured to articulate with the medial condylar bearing surface when the prosthesis is installed and a lateral portion comprising a lateral bearing surface configured to articulate with the lateral condylar bearing surface when the prosthesis is installed, wherein; the medial bearing surface comprises an anterior-most edge and a posterior-most edge; the lateral bearing surface comprises an anterior-most edge and a posterior-most edge; the medial bearing surface has a minimum thickness that is thicker in a superior-inferior direction at the medial bearing surface posterior-most edge than a minimum thickness of the lateral bearing surface at the lateral bearing surface posterior-most edge; and the medial bearing surface has a minimum thickness that is thinner in a superior-inferior direction at the medial bearing surface anterior-most edge than a minimum thickness of the lateral bearing surface at the lateral bearing surface anterior-most edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A prosthesis for replacement of a least part of a knee joint in a leg, the leg including a femur and a tibia, the prosthesis comprising:
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a femoral component adapted to fit on a distal end of the femur, the femoral component comprising; a lateral condylar structure defining a lateral condylar bearing surface; and a medial condylar structure defining a medial condylar bearing surface; a tibial component adapted to fit on a proximal end of the tibia, the tibial component comprising; a medial portion comprising a medial bearing surface and a lateral portion comprising a lateral bearing surface, the medial bearing surface comprising a posterior-most edge and the lateral bearing surface comprising a posterior-most edge, wherein; the medial bearing surface is continuously concave in an anterior-posterior direction; and the medial bearing surface has a greater distance between a most distal point of the medial bearing surface and the posterior-most edge of the medial bearing surface in a superior-inferior direction compared to a distance between a most distal point of the lateral bearing surface and the posterior-most edge of the lateral bearing surface in a superior-inferior direction. - View Dependent Claims (16, 17, 18, 19)
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Specification