Abstract: A cotyloidal component for a non-cemented hip prosthesis comprises a hemispherical titanium dome member and a cup of polymer material which is engaged therein to form a friction lining and to receive the spherical head of a femoral component. The titanium dome member comprises a first zone in the form of a portion of a sphere which is angularly displaced with respect to the dome member to be tangential to the equatorial edge and to bear against the roof part of the acetabulum. Disposed in projecting relationship in the zone are two stud portions for the passage therethrough of screws provided to engage into the roof part of the acetabulum and form a primary anchoring means. The zone is covered with a covering of porous titanium capable of being invaded by growing spongy bone to form a secondary anchoring. The second zone is smooth and comprises slots along meridians of the dome member to afford a capacity for elastic deformation comparable to that of the acetabulum in the region of the horns thereof.

Abstract: A tibial component for a unicompartmental knee prosthesis intended to be fitted without cement, comprises a metal base portion in the general form of a segment of a circular disc with generally flat upper, lower and lateral faces, the latter which is perpendicular to the others extending along the chord of the segment, and a periphery in the form of an arc of a cylinder, the lower and lateral faces being provided to bear against two notch surfaces provided in the plate of the tibia, respectively perpendicular to the general direction of the tibia and parallel thereto along the intercondylar eminence, and a plate member of polymer material which is fixed to the upper face of the base portion and forming a lining for the support of a corresponding condylar component, the base portion having on its lateral face at least one projection arranged to be driven in under the intercondylar eminence, at least one passage for a pinning means to engage into the subjacent bone in the vicinity of its periphery, and on its u

Abstract: 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.