Cruciate-retaining tibial prosthesis
First Claim
1. A tibial prosthesis comprising:
- a medial base portion configured to engage a medial surface of a tibia, the medial base portion including a mesial wall;
a lateral base portion configured to engage a lateral surface of the tibia, wherein at least a portion of the medial and lateral base portions are separated by a passage interposed therebetween, the lateral base portion including a mesial wall, wherein at least one of the mesial walls is angled in a superior-inferior direction so that a distance between the mesial walls taken at a superior point on the walls is less than a distance between the mesial walls taken at a relatively more inferior point; and
a bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the bridge is elevated above a portion of the passage between the medial base portion and the lateral base portion, the bridge defining an underside surface that receives at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein a height of the underside surface of the bridge in a superior direction varies in a medial to lateral direction across the passage and increases in an anterior to posterior direction along the passage, and wherein the bridge comprises an anterior face that closes the bridge at a first end thereof, the anterior face extending inferiorly a predetermined distance to close the passage adjacent the first end.
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Accused Products
Abstract
A tibial prosthesis comprises a medial base portion configured to engage a medial surface of a tibia and a lateral base portion configured to engage a lateral surface of the tibia. At least a portion of the medial and lateral base portions are separated by a passage interposed therebetween. The tibial prosthesis also comprises a bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the bridge is elevated above a portion of the passage between the medial base portion and the lateral base portion. The bridge may define an underlying area that receives at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein the height of the bridge varies in a superior direction across the passage.
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Citations
15 Claims
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1. A tibial prosthesis comprising:
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a medial base portion configured to engage a medial surface of a tibia, the medial base portion including a mesial wall; a lateral base portion configured to engage a lateral surface of the tibia, wherein at least a portion of the medial and lateral base portions are separated by a passage interposed therebetween, the lateral base portion including a mesial wall, wherein at least one of the mesial walls is angled in a superior-inferior direction so that a distance between the mesial walls taken at a superior point on the walls is less than a distance between the mesial walls taken at a relatively more inferior point; and a bridge coupling the medial base portion and the lateral base portion, wherein at least a portion of the bridge is elevated above a portion of the passage between the medial base portion and the lateral base portion, the bridge defining an underside surface that receives at least a portion of a tibial eminence when the tibial prosthesis is engaged with the tibia, wherein a height of the underside surface of the bridge in a superior direction varies in a medial to lateral direction across the passage and increases in an anterior to posterior direction along the passage, and wherein the bridge comprises an anterior face that closes the bridge at a first end thereof, the anterior face extending inferiorly a predetermined distance to close the passage adjacent the first end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification