Abstract: A bone prosthesis for implantation at a joint includes a stem having a tip generally at one end thereof. The stem is sized and shaped for reception in a bone at the joint such that the tip of the stem is exposed to locations outside of the bone. The stem has a passageway extending from a first location on the bone prosthesis to a second location on the bone prosthesis.

Abstract: A prosthesis for implantation in a bone includes a collar having a first surface and a second surface generally on an opposite side of the collar for engaging the bone and transferring forces to the bone. A neck extends outwardly from the first surface and is adapted to receive a ball thereon. A stem extends outwardly from the second surface of the collar for reception in the bone. The second surface is shaped to promote force transmitting engagement of the second surface with the bone over at least a substantial portion of the second surface, to limit engagement of the second surface with the bone at an area of stress concentration in the second surface, and to inhibit line contact between the second surface and bone.

Abstract: A bone prosthesis for implantation at a joint includes a stem having a tip generally at one end thereof. The stem is sized and shaped for reception in a bone at the joint such that the tip of the stem is exposed to locations outside of the bone. The stem has a passageway extending from a first location on the bone prosthesis to a second location on the bone prosthesis.

Abstract: A prosthesis for implantation in a bone includes a collar having a first surface and a second surface generally on an opposite side of the collar for engaging the bone and transferring forces to the bone. A neck extends outwardly from the first surface and is adapted to receive a ball thereon. A stem extends outwardly from the second surface of the collar for reception in the bone. The second surface is shaped to promote force transmitting engagement of the second surface with the bone over at least a substantial portion of the second surface, to limit engagement of the second surface with the bone at an area of stress concentration in the second surface, and to inhibit line contact between the second surface and bone.

Abstract: A femoral head-neck prosthesis (1) which allows natural straining of the upper femur to prevent bone loss. The natural angle of loading of the bone is determined prior to the operation, and the prosthesis is implanted with its longitudinal axis (AX-1) parallel to the natural angle (AX-5). The prosthesis is constructed to inhibit axial fixation and “splinting” of the prosthesis below the interface between the femur neck and the prosthesis on the upper femur. Splines (19) on a stem (13) of the prosthesis help to fix the prosthesis against rotation and toggling motion. The prosthesis is asymmetrical about its longitudinal axis to provide further stability when implanted. The prosthesis and its method of implantation preserve the trochanter and cap the femur to prevent microscopic debris from entering the interior bone.

Abstract: An implantable acetabular hip prosthesis includes a primary shell having an outer surface adapted to be received within a surgically prepared acetabulum, and an inner cavity for receiving a bearing insert which, in turn, receives a femoral head portion of a femoral component of a total hip prosthesis. The acetabular component of the prosthesis further includes an augmentation piece which is attachable to the primary shell and which fills a defect, such as a rim or cavitary defect, adjacent the natural acetabulum. The augmentation piece may be fixedly retained in a selected one of a plurality of angular orientations, relative to the primary shell. A plurality of augmentation pieces of varying sizes and shapes may be provided to allow the orthopedic surgeon to select an appropriate augmentation piece to match the defect.

Abstract: A method for implanting an extramedullary femoral head-neck prosthesis in the femur, the latter having a shaft and a neck at the upper end of the shaft at the medial side of the femur, includes determining the axis of the medial trabecular stream, cutting the neck of the femur to form a seat on the femur neck, and drilling a bore through the shaft of the femur to extend from the neck of the femur down to the lateral side of the shaft along a line substantially parallel to the axis of the medial trabecular stream. A barrel having an open end is inserted into the bore with the open end of the barrel facing upwardly and secured in fixed position in the bore. A stem of a ball assembly is inserted coaxially into the barrel to bring a generally planar surface of the ball assembly into congruent, face-to-face engagement with the planar surface of the femur neck.

Abstract: An extramedullary femoral head-neck prosthesis for implantation in a femur, the latter having a shaft and a neck at the upper end of the shaft at the medial side of the femur. The prosthesis comprises a sideplate and screws for securing the sideplate to the lateral side of the femoral shaft. A barrel extends obliquely upwardly from the sideplate and has an open upper end. The barrel is adapted to be inserted in a bore extending obliquely upwardly through the femoral shaft from the lateral side of the shaft to the femoral neck. The prosthesis also includes a ball assembly comprising a ball stem adapted to be inserted coaxially into the barrel through the open upper end of the barrel and to be slideably received therein, a neck at the upper end of the stem adapted for face-to-face engagement with the femoral neck, and a ball on the neck. The ball stem is sized for a relatively close clearance fit in the barrel.