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US 2022/0175542 A1Published application
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.
Claims35
A posterior-stabilized orthopaedic system comprising:
- a femoral component having a medial condyle, a lateral condyle spaced apart from the medial condyle by a notch, and cam located in the notch between the medial and lateral condyles;
- and
- 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,
- wherein the medial condyle of the femoral component is configured to articulate on the medial articular surface of the tibial insert and the lateral condyle of the femoral component is configured to articulate on the lateral articular surface of the tibial insert during flexion and wherein the cam of the femoral component initially contacts a posterior surface of the post of the tibial insert at a contact location on the post during flexion,
- wherein, when the tibial insert is viewed in a sagittal plane, the medial articular surface of the tibial insert includes a dwell point that is spaced by a distance in an anterior-posterior direction from the contact location of the post, the distance being less than or equal to 5 millimeters.
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An orthopaedic system comprising:
- a femoral component having a medial condyle, a lateral condyle spaced apart from the medial condyle by a notch, and cam located in the notch between the medial and lateral condyles;
- a posterior-stabilized tibial insert having a first medial articular surface, a first lateral articular surface, and a first post located between the first medial and first lateral articular surfaces, wherein the first medial and first lateral articular surfaces are asymmetrically-shaped relative to each other;
- and
- a revision constrained condylar tibial insert having a second medial articular surface, a second lateral articular surface, and a second post located between the second medial and second lateral articular surfaces, wherein the second medial and second lateral articular surfaces are asymmetrically-shaped relative to each other and the second post is larger than the first post of the posterior-stabilized tibial insert,
- wherein the medial condyle of the femoral component is configured to separately articulate on each of the first and second medial articular surfaces and the lateral condyle of the femoral component is configured to separately articulate on each the first and second lateral articular surfaces.
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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 second 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.
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Dependencies are inferred from the claim text.