Patent ID: 8764840

Claim:
A tibial prosthesis for replacing at least part of a natural knee, said tibial prosthesis comprising: a unitary bearing component comprising: a proximal surface including first and second concave articulating surfaces, each configured for articulation with opposing condyles of a femur or a femoral prosthesis, and a distal surface opposite said proximal surface, said distal surface having a notch formed therein: and a tibial tray comprising: a support surface sized to support said distal surface of said unitary bearing component, said support surface having a lateral edge and a medial edge, and a boss projecting proximally from said support surface, said boss having a concave lateral side facing said lateral edge of said tibial tray and a convex medial side facing said medial edge of said tibial tray, said unitary bearing component rotatable about an axis of rotation between a disassembled position and an assembled position, said axis of rotation displaced laterally from said medial side of said boss, such that rotation of said unitary bearing component from said disassembled position to said assembled position advances said boss of said tibial tray into said notch of said unitary bearing component, said unitary bearing component locked to said tibial tray in said assembled position to create a fixed bearing prosthesis.