Orthopaedic system with medial pivoting femoral component and insert
AssigneeDepuy Ireland Unlimited Company
InventorsStephen E. White, William J. Maloney
Life of this patent
Estimating the term…
Abstract
An orthopaedic system includes a tibial insert and a femoral component configured to articulate on the tibial insert. The tibial insert includes an articular surface, and the femoral component includes a femoral articular surface having decreasing radii of curvature posteriorly. The articular surface of the tibial insert includes an increased anterior lip to improve stability of the femoral component.
Claims28
An orthopaedic system comprising:
- a tibial insert having a medial articular surface and a lateral articular surface, wherein the medial and lateral articular surfaces are asymmetrically shaped relative to each other;
- and
- a femoral component having a medial condyle configured to articulate on the medial articular surface of the tibial insert and a lateral condyle configured to articulate on the lateral articular surface of the tibial insert, wherein the medial condyle of the femoral component includes a femoral articular surface having a first radius of curvature that extends posteriorly to a first degree of flexion of 70 degrees or less and a plurality of decreasing radii of curvature that extend posteriorly from the first degree of flexion to a second degree of flexion greater than the first degree of flexion.
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A tibial insert of a knee replacement system, the tibial insert comprising:
- a lateral articular surface configured to articulate with a lateral condyle of a femoral component;
- and
- a medial articular surface configured to articulate with a medial condyle of the femoral component, wherein the medial articular surface is asymmetrically shaped relative to the lateral articular surface and includes a dwell point and an anterior medial lip having a height, relative to the dwell point, of at least nine millimeters.
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An orthopaedic system comprising:
- a tibial insert comprising a lateral articular surface and a medial articular surface, and
- a femoral component comprising a medial condyle configured to articulate on the medial articular surface of the tibial insert, and a lateral condyle configured to articulate on the lateral articular surface of the tibial insert, the medial condyle of the femoral component including a femoral articular surface having a first radius of curvature that extends posteriorly to a first degree of flexion of 70 degrees or less and a plurality of decreasing radii of curvature that extend posteriorly from the first degree of flexion to a second degree of flexion greater than the first degree of flexion,
- wherein the medial articular surface of the tibial insert is asymmetrically-shaped relative to the lateral articular surface and includes a dwell point having an arcuate or oblong shape when viewed in a transverse plane and an anterior medial lip having a height, relative to the dwell point, of at least nine millimeters.
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Dependencies are inferred from the claim text.