PROBLEM TO BE SOLVED: To go up stairs naturally, in a knee joint assembled into a thigh prosthetic foot.SOLUTION: A knee joint 1 has: a thigh side member 10 a lower thigh side member 20 rotatably coupled to the thigh side member 10 a turning regulating means 30 capable of limiting a turning direction of the lower thigh side member 20 to the thigh side member 10 to a one direction of a bending direction and a stretching direction and a switching means 40 switching the turning limiting means 30 to a stretching limiting state and a bending limiting state. It is possible to prevent shortage of bending of the knee articulation or a collision of a foot part with a riser face by overstretching by regulating the turning of the knee articulation in a stretching direction in a leg resting period. Knee folding can be prevented by limiting the turning of the knee articulation in a bending direction in a leg standing period.COPYRIGHT: (C)2014,JPO&INPIT【課題】自然な昇段を可能とする膝継手を提供する。【解決手段】大腿側部材10と、大腿側部材10に対して回動可能に連結された下腿側部材20と、大腿側部材10に対する下腿側部材20の回動方向を、屈曲方向または伸展方向の一方向に制限可能な回動制限手段30と、回動制限手段30を伸展制限状態と屈曲制限状態とで切り替える切替手段40とを備える膝継手1。遊脚期に膝関節の伸展方向の回動を制限すれば膝関節の屈曲不足または過伸展により足部が蹴込面に衝突することを防止できる。立脚期に膝関節の屈曲方向の回動を制限すれば膝折れを防止できる。これにより、自然な昇段が可能となる。【選択図】図4
