Cruciate-retaining knee prosthesis
First Claim
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1. A tibial prosthesis for at least partially replacing a proximal portion of a tibia, the tibial prosthesis comprising:
- (a) a medial baseplate portion comprising a medial inferior surface for contact with a medial resected surface on the proximal portion of the tibia;
(b) a lateral baseplate portion comprising a lateral inferior surface for contact with a lateral resected surface on the proximal portion of the tibia;
(c) a connection baseplate portion extending between the medial and lateral baseplate portions, the connection baseplate portion comprising a connection inferior surface; and
(d) a keel for penetration into a cavity formed in the proximal tibia, wherein the keel extends at an inferior-posterior angle away from at least one of the medial inferior surface, the lateral inferior surface, and the connection inferior surface, the keel including an anterior keel portion, a medial keel portion extending from the medial inferior surface, and a lateral keel portion extending from the lateral inferior surface, the anterior keel portion having an overall length in a medial-lateral direction;
wherein the tibial prosthesis defines a notch between the medial and lateral baseplate portions posterior to the connection baseplate portion, the notch having a length in the medial-lateral direction, wherein the overall length of the anterior keel portion in the medial-lateral direction is greater than the length of the notch in the medial-lateral direction; and
wherein the anterior keel portion extends across the connection baseplate portion such that medial portions of the anterior keel portion are positioned further anteriorly than corresponding lateral portions of the anterior keel portion.
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Accused Products
Abstract
Certain embodiments generally provide an improved tibial base member comprising keel portions that allow one or both cruciate ligaments to be preserved. Other embodiments provide improved lateral and/or medial inserts having a mesial lip that helps relieve and/or prevent impingement between the femoral component and the tibial eminence. Other embodiments provide improved femoral components having various chamfers to provide additional clearance with respect to the tibial eminence and posterior cruciate ligament without decreasing bone coverage.
302 Citations
45 Claims
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1. A tibial prosthesis for at least partially replacing a proximal portion of a tibia, the tibial prosthesis comprising:
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(a) a medial baseplate portion comprising a medial inferior surface for contact with a medial resected surface on the proximal portion of the tibia; (b) a lateral baseplate portion comprising a lateral inferior surface for contact with a lateral resected surface on the proximal portion of the tibia; (c) a connection baseplate portion extending between the medial and lateral baseplate portions, the connection baseplate portion comprising a connection inferior surface; and (d) a keel for penetration into a cavity formed in the proximal tibia, wherein the keel extends at an inferior-posterior angle away from at least one of the medial inferior surface, the lateral inferior surface, and the connection inferior surface, the keel including an anterior keel portion, a medial keel portion extending from the medial inferior surface, and a lateral keel portion extending from the lateral inferior surface, the anterior keel portion having an overall length in a medial-lateral direction; wherein the tibial prosthesis defines a notch between the medial and lateral baseplate portions posterior to the connection baseplate portion, the notch having a length in the medial-lateral direction, wherein the overall length of the anterior keel portion in the medial-lateral direction is greater than the length of the notch in the medial-lateral direction; and wherein the anterior keel portion extends across the connection baseplate portion such that medial portions of the anterior keel portion are positioned further anteriorly than corresponding lateral portions of the anterior keel portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A tibial prosthesis for at least partially replacing a proximal portion of a tibia, the tibial prosthesis comprising:
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(a) a medial baseplate portion comprising a medial inferior surface for contact with a medial resected surface on the proximal portion of the tibia; (b) a lateral baseplate portion comprising a lateral inferior surface for contact with a lateral resected surface on the proximal portion of the tibia; (c) a connection baseplate portion extending between the medial and lateral baseplate portions, the connection baseplate portion comprising a connection inferior surface; and (d) a keel for penetration into a cavity formed in the proximal tibia, wherein the keel extends at an inferior-posterior angle away from at least one of the medial inferior surface, the lateral inferior surface, and the connection inferior surface, the keel including an anterior keel portion, a medial keel portion extending from the medial inferior surface, and a lateral keel portion extending from the lateral inferior surface; wherein the tibial prosthesis defines a notch between the medial and lateral baseplate portions posterior to the connection baseplate portion, the notch having a medial edge along the medial baseplate portion, and a lateral edge along the lateral baseplate portion; wherein the anterior keel portion extends medially of the medial edge of the notch and extends laterally of the lateral edge of the notch; and wherein the anterior keel portion extends across the connection baseplate portion such that medial portions of the anterior keel portion are positioned further anteriorly than corresponding lateral portions of the anterior keel portion. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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38. A tibial prosthesis for at least partially replacing a proximal portion of a tibia, the tibial prosthesis comprising:
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(a) a medial baseplate portion comprising a medial inferior surface for contact with a medial resected surface on the proximal portion of the tibia; (b) a lateral baseplate portion comprising a lateral inferior surface for contact with a lateral resected surface on the proximal portion of the tibia; (c) a connection baseplate portion extending between the medial and lateral baseplate portions, the connection baseplate portion comprising a connection inferior surface; and (d) a keel for penetration into a cavity formed in the proximal tibia, wherein the keel extends at an inferior-posterior angle away from at least one of the medial inferior surface, the lateral inferior surface, and the connection inferior surface, the keel including an anterior keel portion, a medial keel portion extending from the medial inferior surface, and a lateral keel portion extending from the lateral inferior surface; wherein the anterior keel portion comprises an anterior-most surface of the keel and the anterior keel portion extends from the anterior-most surface to the lateral keel portion and the medial keel portion, the anterior keel portion having an overall length in a medial-lateral direction and an overall thickness in an anterior-posterior direction, the overall length being greater than the overall thickness; and wherein the anterior keel portion extends across the connection baseplate portion such that medial portions of the anterior keel portion are positioned further anteriorly than corresponding lateral portions of the anterior keel portion. - View Dependent Claims (39, 40, 41, 42, 43, 44)
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45. A tibial prosthesis for at least partially replacing a proximal portion of a tibia, the tibial prosthesis comprising:
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(a) a medial baseplate portion comprising a medial inferior surface for contact with a medial resected surface on the proximal portion of the tibia; (b) a lateral baseplate portion comprising a lateral inferior surface for contact with a lateral resected surface on the proximal portion of the tibia; (c) a connection baseplate portion extending between the medial and lateral baseplate portions, the connection baseplate portion comprising a connection inferior surface; and (d) a keel for penetration into a cavity formed in the proximal tibia, wherein the keel extends at an inferior-posterior angle away from at least one of the medial inferior surface, the lateral inferior surface, and the connection inferior surface, the keel including an anterior keel portion, a medial keel portion extending from the medial inferior surface, and a lateral keel portion extending from the lateral inferior surface, the anterior keel portion having an overall length in a medial-lateral direction; wherein the tibial prosthesis defines a notch between the medial and lateral baseplate portions posterior to the connection baseplate portion, the notch having a length in the medial-lateral direction, wherein the overall length of the anterior keel portion in the medial-lateral direction is greater than the length of the notch in the medial-lateral direction; wherein the anterior keel portion has an anterior surface that extends along the connection baseplate portion, the anterior surface having a medial region located medial to the notch and a lateral region located lateral to the notch, the medial region and the lateral region being in a plane parallel to the connection inferior surface, wherein the medial region of the anterior surface is positioned anterior to the lateral region of the anterior surface.
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Specification