PROBLEM TO BE SOLVED: To induce a bend/extension motion and a rotation motion simultaneously.SOLUTION: The invention comprises: a femur component FC comprising an internal condyle MC comprising a rear condyle side ball center DO2 in which diameter to a joint lowest point is reduced as an angle is increased from a constant bend angle, and an external condyle LC comprising a rear condyle side ball center DO1 in which diameter to the joint lowest part by bend, is constant and a tibia component TC in which an internal condyle side joint surface in which, a lowest point on the rear condyle side of the internal condyle part following to bending of a knee is a horizontal level, and an external condyle side joint surface which moves to a rear inside distal direction with rotation following to bending, are formed as negative models of both condyle parts of a femur.SELECTED DRAWING: Figure 8COPYRIGHT: (C)2017,JPO&INPIT【課題】屈曲伸展運動と回旋運動とを同時に誘発すること。【解決手段】一定の屈曲角度から角度が増す毎に関節最下点までの径が短縮する後顆側球心DO2を有する内顆部MC、及び屈曲による関節最下点までの径が一定となる後顆側球心DO1を有する外顆部LCを形成した大腿骨コンポーネントFCと、膝屈曲に伴う上記内顆部の後顆側の最下点位置を水平位にした内顆側関節面、屈曲に伴い後内遠位方向に回旋を伴って移動する外顆側関節面を大腿骨両顆部の陰性モデルとして形成した脛骨コンポーネント(TC)とを備える。【選択図】図8
