Patent ID: 8382847

Claim:
A knee prosthesis comprising: a femoral component configured to be attached to a distal end of a femur and having medial and lateral condyle surfaces spaced apart from each other to define a notch therebetween, said notch defining an elongated cam housing having a posterior cam at one end of said cam housing; a tibial component including a platform configured for attachment to a proximal end of a tibia and a bearing supported on and rotatable in relation to said platform, said bearing defining (i) medial and lateral bearing surfaces configured to articulate with said medial and lateral condyle surfaces, and (ii) a spine projecting superiorly within said cam housing when said condyle surfaces are in articulating contact with said bearing surfaces, wherein said spine defines a posterior face facing said posterior cam and configured for cooperative engagement with said posterior cam, said spine further defining a bore therethrough, and said spine further being formed of a first material, and further said cam housing defines a width sufficient to provide a clearance ranging between about 0.12 mm to about 0.50 mm on each side of said spine when said spine projects into said cam housing; and a pin configured to be disposed within said bore, said pin being formed of a second material which is different from said first material.