Femoral head prosthesis

An implant for replacing the proximal portion of a femur having a substantially intact natural femoral neck and a lateral side opposite the femoral neck, with a bore extending through the femoral neck through a lateral side of the femur, the bore having an opening through cortical bone at the lateral side of the femur, the implant comprising:

• a sleeve having a flange for engaging a proximally facing resected surface of the neck surrounding the bore in the femur and having an extension with an outer cylindrical surface matching an inner surface of the bore in the femur integrally formed with the flange, extension having a bore with a conical portion tapered inwardly on moving from proximal to distal;
• a solid body member having a longitudinal axis, a distal end, and a proximal end, being configured for positioning, in use, in the bore through the femur, the distal end having a cylindrical distal tip with a smooth outer surface, the body member having a distal shaft portion of sufficient length to locate the cylindrical distal tip at least partially beyond the bore opening through the cortical bone at the lateral side of the femur, the solid body member having an intermediate conically tapered male portion tapered inwardly on moving in a proximal to distal direction for coupling to the conically tapered bore of the sleeve and a proximal end having a conically tapered portion which tapers inwardly on moving in a distal to proximal direction;
• a head member having a distal end and a proximal substantially-spherical portion configured for positioning in a natural or prosthetic hip socket, the distal end of the head member including a conically tapered bore for coupling to the proximal conically tapered portion of the solid body member;
• and
• wherein no threaded elements pass within or through the femur.