Importance

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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 upper face fixing means for fixing the plate member, which can be used after the base portion has been set in position, and at least a part of the surface of the base portion which is brought into contact with the bone being lined with a covering of porous metal capable of being invaded by the growing spongy bone.

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First Claim