Solutions The artificial knee joint has with the femoral element and the tibia element, front and back movement of the femur is possible because of this vis-a-vis the tibia, the between particular tibia of crookedness of the knee around the vertical axis turning is possible. It connects the aforementioned femoral element to the distal (2036) edge of the femur which corresponds, inside possessing the distal (2036) joint formation aspect, it possesses with the condyle and the outer part condyle and the knee cover flange which possesses the knee cover joint formation aspect. It connects the aforementioned tibia element to the proximal edge of the tibia which corresponds, the condyle and the outer part condyle and the joint inside the description above inside connecting, it includes the proximal bearing surface which possesses the concave surface and the outer part concave surface. The aforementioned condylar joint formation aspect and the aforementioned concave surface substantial the non uniform rational B spline (non uniform rational B splines: It is defined NURBS) by the curved surface. < Selective figure > Figure 1【解決手段】 人工膝関節は大腿骨要素と脛骨要素とを有し、これにより脛骨に対して大腿骨の前後移動が可能であり、膝の屈曲の間当該脛骨がその縦軸の周りを回転することが可能である。前記大腿骨要素は対応する大腿骨の遠位端に接合し、遠位関節形成面を有する内側顆および外側顆と、膝蓋関節形成面を有する膝蓋フランジとを有する。前記脛骨要素は対応する脛骨の近位端に接合し、前記内側顆および外側顆と関節接合する内側凹面および外側凹面を有する近位座面を含む。前記顆関節形成面および前記凹面は、実質的に非均一有理Bスプライン(non-uniform rational B-splines:NURBS)曲面により定義される。【選択図】 図1
