Multiple component hip femoral prosthesis.

摘要

Disclosed herein is a multiple component hip femoral prosthesis system having a stem component (11) for intramedullary implantation in a truncated femur, a neck component (12) connected to the stem component (11) by means of a stud (18) projecting from one of the components and mating with a recess (20) provided in the other for reciprocating movement therein, a rigid calcar collar (14) slideably positioned on the stud (18) and designed to overlie the cut end of the bone including at least a substantial portion of the calcar (14), a cushioning body (15) of elastomeric material such as silicone rubber interposed between the calcar collar (14) and a shoulder (19) on the neck component (12), and a ball-shaped femoral head (13) preferably detachably mounted on the upper end of the neck component (12) for articulation with the acetabulum or an acetabular prosthesis. The stud (18) is enabled to slide up and down in the mating recess (20) as stresses are applied and relieved. The cushioning body (15) absorbs shock and causes forces to be substantially evenly distributed over the calcar collar (14) which in turn distributes forces over a large bone area to prevent localized stresses and bone resorption and the stem (11) is effectively isolated from shock forces.