Abstract: The present invention provides a positioner for controlling the position of a femoral hip implant within the intramedullary canal of a femur.

Abstract: An acetabular cup assembly includes a shell component, a liner component, and means for retaining the liner in the shell including a spherical profile thread spiraling around a portion of each of the shell and liner.

Abstract: The present invention provides an improved junction for modular implant components.

Abstract: A wrench assembly used to restrain an implant while applying a torque to a portion of the implant. The wrench assembly conveniently restrains the implant relative to the torque whether the implant is implanted or not. In the case where the implant is first implanted, the wrench assembly guards against displacing the implant or splitting the bone. The wrench assembly includes a handle and a socket shaft depending from the handle in torque transmitting relation. A socket is coupled to the socket shaft in torque transmitting relation. The socket has an implant engaging portion for engaging the implant in torque transmitting relation. The socket further has a through hole aligned with the portion of the implant. A driving shaft passes through the through hole in the socket and engages the portion of the implant such that with the handle torsionaly fixed, the implant is torsionaly fixed by way of the handle, socket shaft, socket and implant connections.

Abstract: An improved rotary tool head includes a modular embodiment having a shaft with a tapered insertion end to ease insertion into a handpiece socket and to cause self-alignment of the shaft with the socket. Another embodiment of the improved rotary tool head includes a collet with nonlinear slots separating the collet tangs. The nonlinear slots cause a wire or shaft inserted into the collet to be centralized in the collet and prevent the wire or shaft from protruding between the tangs.