Cementless femoral component of a hip prosthesis

摘要

The femoral component of a hip prosthesis comprises a shaft, from the upper face of which projects a neck carrying a spherical head intended to seat in a cotyloid component. The shaft, which tapers toward a lower end, is curved to connect the neck to the axis of the femur, and comprises, in its upper part, two planer frontal faces, each cut by dovetail-shaped channels. Two packing pieces, an anterior packing piece and a posterior packing piece, engage these faces through bearing faces. Towards the lower part of each packing piece, a stud with a frustoconical head engages the dovetail-shaped channel to guide the packing piece during the installation of the femoral component and to permit a millimetric displacement of the core relative to the packing pieces and to the femur, in response to the variations in the verticle load on the prosthesis. The packing pieces have external convex faces. The external convex faces of the packing pieces are rough to assure connection with the spongy bone as it grows.