Patent ID: 7452381

Claim:
A modular prosthesis for replacing an end portion of a bone, the prosthesis comprising: a stem dimensioned to be received in the intramedullary canal of the bone; a head having an outer wall defining an interior space dimensioned such that the head can be placed over an end portion of the stem, the outer wall having an opening, the outer wall being dimensioned such that the head can be translated in an axial direction in relation to an axis of the stem and the head can be translated in a transverse direction in relation to the axis of the stem when the end portion of the stem is placed in the interior space of the head, the outer wall of the head of the prosthesis including a concave surface dimensioned to interface with another bone when the head of the prosthesis is secured to the stem; and a screw dimensioned to be arranged in the opening, wherein the screw is suitable for contacting the end portion of the stem when arranged in its associated opening to secure the head to the stem by constraining movement of the head in the axial direction and in the transverse direction, and wherein the opening is in a lateral direction in relation to the axis of the stem, and wherein an interior surface of the outer wall of the head adjacent the opening is spaced from the end portion of the stem when the head is secured to the stem, and wherein the end portion of the stem includes an end surface and a side surface extending away from the end surface, the side surface having a curved periphery when viewed in a cross-section transverse to the axis of the stem, and wherein the screw contacts the side surface of the end portion of the stem when the head is secured to the stem.