Disclosed is a simple structure and low cost without complicating the structure, the human knee joint motion, especially deep series of smooth and the knee joint which can accurately reproduce the movement from the state of the bent up Shinashi, and, the provision of prosthetic and power assist device using the same. . And A femoral component 20 having an outer condyle 34 having at least an inner condyle 24 and substantially hemispherical part, which has at least a generally semi-spherical portion, the internal condyles 24 while in contact with Ki in the condylar 24 the the condylar receiving groove 34, and the outer condyle 22 and the outer condylar 22 rollably life and death in the condyles 24 with the rolling of the inner condyle 24 while being in contact within to be able to roll the tibial component 30 having an outer condyle receiving groove 32 which allows rotation as rotation axis, said the condyles 24 and such that the receiving groove in the condyles 34 not in contact away from each other, and the outer condyles 22 and the outer a disjunction preventing means condyle receiving groove 32 is prevented from contact away from each other, is a knee joint 10 with a. . [Selection Figure] FIG. 14A.【課題】構造を複雑化させることなく簡単な構造かつ低コストで、人間の膝関節動き、特に深屈曲の状態から伸脚までの一連の動きを円滑かつ正確に再現することができる膝継手、並びに、それを用いた義足及びパワーアシスト装置の提供。【解決手段】 略半球状部分を少なくとも有する内顆部24、及び略半球状部分を少なくとも有する外顆部34を備えた大腿骨コンポーネント20と、記内顆部24と接しつつ前記内顆部24を転動可能にする内顆部受溝34、及び前記外顆部22と接しつつ前記内顆部24の転動に伴って前記外顆部22を転動可能にしかつ前記内顆部24を回旋軸として回旋可能にする外顆部受溝32を有する脛骨コンポーネント30と、前記内顆部24及び前記内顆部受溝34が互いに離接しないように、かつ前記外顆部22及び前記外顆部受溝32が互いに離接しないようにする離接防止手段と、を有する膝継手10である。【選択図】図14A
