Patent ID: 6203576
Filing Date: 2001-03-20
Classification: A61F

Abstract:
A complete knee joint prosthesis comprising:a femoral element which is anchored in the end of the femur and provides prosthetic condyles having front and rear parts that reproduce the femoral condyles;a tibial element which is anchored in the end of the tibia and has an essentially plane upper wall perpendicular to the longitudinal axis of the tibia; andan intermediate plate which provides for the sliding of the femoral and tibial elements in relation to one another, the intermediate plate being capable of pivoting in relation to the tibial element,wherein the prosthetic condyles of the femoral element have rear parts with a curvature in the shape of a circular arc, and the femoral element has, between the prosthetic condyles, a convex cylindrical wall having an axis that coincides with the axis of the curvature in which the rear parts of the prosthetic condyles lie;the prosthetic condyles being received in glenoid cavities in an upper surface of the intermediate plate, the glenoid cavities having rear parts in the shape of a circular arc which have essentially the same radius, play excepted, as the rear parts of the prosthetic condyles and an axis that coincides with that of the curvature in which the prosthetic condyles' rear parts lie, the intermediate plate further comprising a central projecting rib in which a concave bearing surface in the shape of a circular arc is arranged, which has essentially the same radius, play excepted, for congruously receiving the convex cylindrical wall of the femoral element and has an axis which coincides with that of the convex cylindrical wall, andthe intermediate plate or the tibial element having a cylindrical pin forming a pivot, while the tibial element or, respectively, the intermediate plate comprises a cavity, a section which is greater than the cross section of the pin, the cavity being intended to receive the pin with the possibility of multidirectional movement.