Patent ID: 8821579

Claim:
A tibial prosthesis configured for securement to a patient's tibia and for articulation with an adjacent femoral component, the tibial prosthesis comprising: an articulating component having a concave articulating surface to facilitate articulation with the femoral component, wherein the articulating component is formed of a polymer; and a tray component having a proximal, receiving surface that receives the articulating component, a distal, bone-contacting surface opposite the receiving surface that is configured for securement to the patient's tibia, and an outer surface that extends proximally from the bone-contacting surface and beyond the receiving surface to define a rim for supporting the articulating component, the outer surface of the tray component defining a notch positioned to permit flexion of the rim relative to the bone-contacting surface of the tray component, wherein flexion of the rim relative to the bone-contacting surface is configured to reduce forces on an outer edge of the bone-contacting surface to inhibit the tray component from separating from the patient's tibia, wherein the rim comprises an inner surface that defines a peripheral boundary of the receiving surface, and wherein the entire receiving surface within the peripheral boundary is a planar surface.