Abstract: A complete knee joint prosthesis having prosthetic condyles as a part of the femoral element, wherein the prosthetic condyles have a curvature in the shape of a circular arc in their rear part, and the femoral element has, between these prosthetic condyles, a convex cylindrical wall with an axis that coincides with the axis of the circle in which the rear parts of the prosthetic condyles lie. Glenoid cavities of an intermediate plate have corresponding rear parts in the shape of a circular arc and a corresponding concave bearing surface in the shape of a circular arc for pivotably receiving the prosthetic condyles. The tibial element has a cylindrical pin and the intermediate plate comprises a cavity which receives this pin to provide the possibility of multidirectional movement of the prosthetic knee joint.