Patent ID: 8277513

Claim:
A joint prosthesis comprising a tibial tray, a tibial base, a coupler, a tibial articular member, and a femoral articular member, wherein: the tibial tray comprises a proximal surface and a stem protruding distally from the proximal surface, the proximal surface defining a bore therethrough, the proximal surface being sized and shaped such that when the stem is seated in a medullary canal of a tibia from which a proximal portion has been removed, the proximal surface would cover at least part of a cut proximal end of the tibia; the tibial base comprises: a distal surface sized and shaped to interface with the proximal surface of the tibial tray; and a proximal surface sized and shaped to attach to the tibial articular member; the coupler comprises: a proximal portion having a mating surface with a constant non-tapering cross-sectional geometry along its length that engages the tibial base with an interference fit; and a distal portion having a mating surface with a constant non-tapering cross-sectional geometry along its length that engages the tibial tray bore with an interference fit; the tibial articular member comprises: a distal surface so sized and shaped as to attach to the proximal surface of the tibial base; and a proximal surface sized and shaped to articulate with the femoral articular member; and the femoral articular member comprises: a distal surface sized and shaped to articulate with the proximal surface of the tibial articular member; and a proximal surface sized and shaped to replace at least part of a cut distal end of a femur.