Knee joint prosthesis system and method for implantation
First Claim
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1. A prosthesis for replacing a knee joint between a femur and a tibia, the prosthesis comprising:
- a femoral component including a first condylar portion, a second condylar portion and an intercondylar portion having a first sidewall and a second sidewall;
a tibial component having a bone engaging inferior surface and a bearing engaging superior surface;
a bearing having an inferior surface that engages the bearing engaging superior surface of the tibial component and a superior femoral engaging surface, the bearing defines a pocket; and
a yoke assembly having a yoke base seated in the pocket and a yoke disposed between the bearing and the femoral component, cooperation between the yoke base and the pocket restricts rotation of the yoke assembly relative to the bearing; and
an axle having an axle axis and that hingedly couples the yoke with the femoral component;
wherein rotation of the femoral component about a rotation axis that is perpendicular to the axle axis causes concurrent rotation of the yoke about the rotation axis while the first and second condylar portions rotate along the superior femoral engaging surface of the bearing.
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Abstract
A prosthesis for replacing a knee joint between a femur and a tibia can include a femoral component, a tibial component, a bearing and a yoke assembly. The yoke assembly can have a yoke disposed between the bearing and the femoral component and an axle having an axle axis. The axle can hingedly couple the yoke with the femoral component. Rotation of the femoral component about a rotation axis that is perpendicular to the axle axis causes concurrent rotation of the yoke about the rotation axis.
948 Citations
13 Claims
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1. A prosthesis for replacing a knee joint between a femur and a tibia, the prosthesis comprising:
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a femoral component including a first condylar portion, a second condylar portion and an intercondylar portion having a first sidewall and a second sidewall; a tibial component having a bone engaging inferior surface and a bearing engaging superior surface; a bearing having an inferior surface that engages the bearing engaging superior surface of the tibial component and a superior femoral engaging surface, the bearing defines a pocket; and a yoke assembly having a yoke base seated in the pocket and a yoke disposed between the bearing and the femoral component, cooperation between the yoke base and the pocket restricts rotation of the yoke assembly relative to the bearing; and an axle having an axle axis and that hingedly couples the yoke with the femoral component; wherein rotation of the femoral component about a rotation axis that is perpendicular to the axle axis causes concurrent rotation of the yoke about the rotation axis while the first and second condylar portions rotate along the superior femoral engaging surface of the bearing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A prosthesis for replacing a knee joint between a femur and a tibia, the prosthesis comprising:
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a femoral component including a first condylar portion, a second condylar portion and an intercondylar portion having a first sidewall and a second sidewall; a tibial component having a bone engaging inferior surface and a bearing engaging superior surface; a bearing having an inferior surface that engages the bearing engaging superior surface of the tibial component and a superior femoral engaging surface, the bearing further having sidewalls that define a pocket on the superior femoral engaging surface; and a yoke assembly having a yoke disposed between the bearing and the femoral component and an axle having an axle axis and that hingedly couples the yoke with the femoral component, a portion of the yoke assembly is seated within the pocket such that the yoke is bound by the sidewalls defining the pocket and rotation of the yoke assembly is restricted by the sidewalls; wherein rotation of the femoral component about a rotation axis that is perpendicular to the axle axis causes concurrent rotation of the yoke and the bearing about the rotation axis while the first and second condylar portions rotate along the superior femoral engaging surface of the bearing. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A prosthesis for replacing a knee joint between a femur and a tibia, the prosthesis comprising:
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a femoral component including a first condylar portion, a second condylar portion and an intercondylar portion having a first sidewall and a second sidewall; a tibial component having a bone engaging inferior surface and a bearing engaging superior surface; a bearing having an inferior surface that fixedly engages the bearing engaging superior surface of the tibial component and a superior femoral engaging surface, the bearing including sidewalls defining a pocket; a yoke assembly including, a yoke base nestingly seated within the pocket such that rotation of the yoke assembly is restricted by the sidewalls, a yoke, a fastener, and an axle having an axle axis, the yoke comprising a yoke base defining a passage configured to receive the fastener therethrough, an axle passage configured to receive the axle for rotation about the axle axis, and a pin passage extending generally perpendicular to the axle passage; and a hyperextension stop disposed between the femoral component and the yoke, the hyperextension stop includes a pin configured to extend into the pin passage and couple the hyperextension stop to the yoke; wherein the yoke and yoke base are configured to collectively rotate about a rotation axis that is perpendicular to the axle axis relative to the tibial component, and cooperation between the yoke base and the sidewalls of the pocket prevents independent rotation of the yoke assembly relative to the bearing.
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Specification