Patent ID: 11911279
Assignee: ZIMMER, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A posterior-stabilized femoral prosthesis for a knee arthroplasty comprising:
medial and lateral condyles shaped to articulate with a tibial articular surface of a tibial bearing component through a range of motion, in which full extension corresponds to zero degrees flexion of a knee joint and positive flexion corresponds to greater than zero degrees flexion of the knee joint, wherein in a sagittal plane the medial and lateral condyles define medial and lateral multi-radius curves, respectively, and wherein the medial multi-radius curve includes a single common radius swept through a first angular extent to define a single arc; and
a femoral cam and a recess positioned between the medial and lateral condyles, wherein the femoral cam is positioned posterior of the recess, wherein an area of contact between the medial condyle and the tibial articular surface includes a medial dwell point of the tibial articular surface when the femoral prosthesis is in full extension, wherein the area of contact between the medial condyle and the tibial articular surface does not shift position during the range of motion encompassing at least a majority of the single arc;
wherein a medial compartment of the tibial articular surface is configured to have between about a 1.05:1 congruence ratio and about a 1.5:1 congruence ratio with the medial condyle through the first angular extent, the congruence ratio comprising a ratio of a similarity between a sagittal radius of the medial compartment and a sagittal radius of the medial condyle.