Femoral head-neck prosthesis and method of implantation

A - Human Necessities – 61 – F

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A61F 2/32 (2006.01) A61F 2/36 (2006.01)

Patent

CA 2263383

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.

L'invention porte sur une prothèse de la tête et du col du fémur (1) permettant un effort naturel de la partie supérieure du fémur afin d'empêcher une déperdition osseuse. On détermine, avant d'opérer, l'angle naturel de chargement de l'os et l'on implante la prothèse de façon à ce que son axe longitudinal (AX-1) reste parallèle à cet angle naturel (AX-5). La prothèse est conçue de manière à interdire une fixation axiale et une "fragmentation" sous l'interface existant entre elle et le col fémoral sur la partie supérieure du fémur. Des cannelures (19) sur la tige (13) de la prothèse contribuent à l'empêcher de tourner sur elle-même et de basculer. La prothèse est asymétrique autour de son axe longitudinal afin de renforcer sa stabilité après implantation. La prothèse et la technique d'implantation selon l'invention protègent le trochanter et la calotte du fémur afin d'empêcher la pénétration de débris microscopique dans l'os.

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