Asymmetric tibial components for a knee prosthesis
First Claim
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1. A small-stature tibial baseplate, comprising:
- a tibial plateau having an overall medial/lateral extent of between about 57 mm and about 61 mm and an overall anterior/posterior extent substantially perpendicular to the overall medial/lateral extent of between 40 mm and 43 mm, the tibial plateau including;
a distal surface sized and shaped to substantially cover a proximal resected surface of a tibia;
a proximal surface opposite the distal surface, the proximal surface having a lateral compartment and a medial compartment opposite the lateral compartment, the lateral compartment is asymmetric with respect to the medial compartment about a component anteroposterior axis to define a component asymmetry; and
a peripheral wall extending between the distal surface and the proximal surface;
a tibial keel extending distally from the distal surface of the tibial plateau to define a longitudinal tibial keel axis; and
a medial fin and a lateral fin spanning a junction between the tibial keel and the distal surface, the medial fin and the lateral fin cooperating to define a medial/lateral fin extent of about 40 mm.
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Abstract
An orthopedic tibial prosthesis includes a tibial baseplate with features designed for use with small-stature knee-replacement patients. The tibial prosthesis may include a shortened tibial keel, tibial keel fins which define a large angle with respect to a longitudinal axis of the keel, and/or tibial keel fins which extend along less than the entire longitudinal extent of the keel.
436 Citations
18 Claims
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1. A small-stature tibial baseplate, comprising:
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a tibial plateau having an overall medial/lateral extent of between about 57 mm and about 61 mm and an overall anterior/posterior extent substantially perpendicular to the overall medial/lateral extent of between 40 mm and 43 mm, the tibial plateau including; a distal surface sized and shaped to substantially cover a proximal resected surface of a tibia; a proximal surface opposite the distal surface, the proximal surface having a lateral compartment and a medial compartment opposite the lateral compartment, the lateral compartment is asymmetric with respect to the medial compartment about a component anteroposterior axis to define a component asymmetry; and a peripheral wall extending between the distal surface and the proximal surface; a tibial keel extending distally from the distal surface of the tibial plateau to define a longitudinal tibial keel axis; and a medial fin and a lateral fin spanning a junction between the tibial keel and the distal surface, the medial fin and the lateral fin cooperating to define a medial/lateral fin extent of about 40 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A small-stature tibial baseplate, comprising:
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a tibial plateau having an overall medial/lateral extent of between about 57 mm and about 61 mm and an overall anterior/posterior extent substantially perpendicular to the overall medial/lateral extent of between 40 mm and 43 mm, the tibial plateau including; a distal surface sized and shaped to substantially cover a proximal resected surface of a tibia; a proximal surface opposite the distal surface, the proximal surface having a lateral compartment and a medial compartment opposite the lateral compartment, the lateral compartment is asymmetric with respect to the medial compartment about a component anteroposterior axis to define a component asymmetry; and a peripheral wall extending between the distal surface and the proximal surface; a tibial keel extending distally from a junction with the distal surface to an opposing distal tip, the tibial keel positioned so as to substantially coincide with an intramedullary canal of the tibia when the distal surface is placed upon the tibia, the tibial keel comprising a first diameter at the junction between the distal surface and the tibial keel and a second diameter at the distal tip of the tibial keel, each of the first diameter and the second diameter equal to or greater than 13 mm, the first diameter greater than the second diameter; and a medial fin and a lateral fin each spanning a portion of the junction between the tibial keel and the tibial plateau, the medial and lateral fins mating with the distal surface at the medial compartment and the lateral compartment, respectively, wherein the medial and lateral fins cooperate to define a medial/lateral fin extent of about 40 mm and the medial lateral/fin extent extends along at least about 70% but less than an entirety of an overall medial/lateral extent of the tibial plateau. - View Dependent Claims (17, 18)
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Specification