Importance

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Abstract

The invention relates to knee joint endoprosthesis consisting of a femur part provided with two skid surfaces leaving a free space between each other, said surfaces being connected with each other in front and having their curvature increasing from the front towards the rear and being curved also on planes perpendicular to said curvature; a tibia part having two surfaces on which the skid surfaces ride in a sliding manner, with an elevation being disposed between said two surfaces; and of artificial connecting means for keeping the two parts of the prosthesis together. The invention lies in the fact that the outer surface (2) of the tibia part is largely plane on a center sectional plane from the front to the rear; that the inner surface (1) of the tibia part is slightly concave on a center sectional plane from the front to the rear; that the slope (6) of the elevation (3; 4) to the outer surface (2) is flatter than the slope (5) of the elevation (3; 4) to the inner surface (1); and that the parts of the prosthesis are kept together by two ending, non-flexible bands, of which a first band extends from the front center of the tibia part upwardly and on the outside and inclined rearwardly to the femur part, and of which bands a second band extends from the rear center of the tibia part upwardly and on the inside and inclined to the front to the femur part, whereby the bands are taut when the knee is stretched, and slightly relaxed in the unstressed state when the knee is bent. In said way, the motions of the prosthesis conform closer to the natural motions than heretofore.

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First Claim