Orthopaedic system with insert having a post for medial pivoting of a femoral component
AssigneeDepuy Ireland Unlimited Company
InventorsStephen E. White, William J. Maloney
Life of this patent
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Abstract
An orthopaedic system includes a tibial insert and a femoral component configured to articulate on the tibial insert. The tibial insert includes a pair of articular surfaces spaced apart by a post. The femoral component includes a pair of femoral condyles spaced apart by a notch in which a cam is located. During flexion, the cam of the femoral component is configured to contact the post of the tibial insert. The dwell point of the medial articular surface of the tibial insert is located, relative to the contact point between the post and tibial insert, to improve stability of the femoral component.
Claims18
1-17. (canceled)
An orthopaedic system comprising:
- a tibial insert having a medial articular surface, a lateral articular surface, and a post located between the medial and lateral articular surfaces, wherein the medial and lateral articular surfaces are asymmetrically-shaped relative to each other;
- a first femoral component having a first medial condyle, a first lateral condyle spaced apart from the first medial condyle by a first notch, and a first cam located in the first notch between the first medial and first lateral condyles, wherein the first medial condyle is configured to articulate on the medial articular surface of the tibial insert and the first lateral condyle is configured to articulate on the lateral articular surface of the tibial insert during flexion and wherein the first cam initially contacts the post of the tibial insert at a first contact location on the first post during flexion;
- and
- a second femoral component having a second medial condyle, a second lateral condyle spaced apart from the second medial condyle by a second notch, and a second cam located in the second notch between the second medial and second lateral condyles, wherein (i) the second medial condyle is configured to articulate on the medial articular surface of the tibial insert and the second lateral condyle is configured to articulate on the lateral articular surface of the tibial insert during flexion, (ii) the second cam initially contacts the post of the tibial insert at a second contact location on the post during flexion, and (iii) the second medial and lateral condyles have a thickness greater than a thickness of the first medial and lateral condyles,
- wherein the medial articular surface of the tibial insert includes a dwell point that is spaced by a first distance in an anterior-posterior direction from the first contact location and by a second distance in the anterior-posterior direction from the second contact location, when each of the first and second distances is less than or equal to 5 millimeters.
Dependencies are inferred from the claim text.