An artificial knee joint and a crescent portion disposed between the femur having a tibia part, the condylar surface of the two, and the tibial part and the femoral portion, the half-moon portion, on the upper surface , has a bearing shell 2 for mounting to receive the condyle surface of the femoral part, on its lower surface, the meniscal bearing to be lean in a displaceable manner on the tibial bearing surface in the upper surface of the tibial part In the artificial knee joint having a surface, to allow the bending angle large as possible so as to be best fitted to the anatomy of the knee joint of the natural, respectively, the tibial bearing surface and the meniscal bearing surfaces have their that it has a spherical or concave spherical projection shifted outward or inward direction with respect to the center, the spherical projection in the bearing surface on one of the bearing surfaces of said two, engaged in the spherical recess of the bearing surface of the other , This makes it possible to form a mounting portion of the ball bearing like the half-moon section with the tibial portion, and, in the inner part or the outer portion of the bearing surfaces of said two bearing surfaces of these supports to be pressed together and forms a region, supporting these regions, dorsal - that is curved in the ventral direction, and has a larger radius of curvature at least 2.5 times than the radius of curvature of the spherical recess and the spherical projection is proposed .脛骨部と、2つの顆表面を有する大腿骨部と、前記大腿骨部と前記脛骨部との間に配置された半月部とを含む人工膝関節であって、前記半月部が、その上面に、前記大腿骨部の前記顆表面を受容して載置するための2つの支承シェルを有し、その下面に、前記脛骨部の上面にある脛骨支承面に変位可能なやり方で寄り掛かる半月支承面を有する人工膝関節において、天然の膝関節の解剖学的構造に最も良好に適合できるようにして極力大きな曲げ角度を許容するために、前記半月支承面と前記脛骨支承面がそれぞれ、各自の中心に関して内側方向又は外側方向にずれた球状突起又は球状凹部を有すること、前記2つの支承面のうち一方の支承面上にある前記球状突起が、他方の支承面の前記球状凹部に係合し、これにより、前記脛骨部上で前記半月部の玉軸受様の載置部を形成すること、及び、前記2つの支承面の外側部又は内側部において、これらの支承面が、互いに押し付けられる支持領域を形成しており、これらの支持領域が、背側‐腹側方向に湾曲し、前記球状突起及び前記球状凹部の曲率半径よりも少なくとも2.5倍大きい曲率半径を有することが提案される。
