Abstract
The purpose of this paper is to introduce biomechanical aspect to the prosthetic gait. The knee joint moment during gait with transfemoral prostheses is mainly explained. The control system of the knee joint of the transfemoral prosthesis is divided into two types; the stance phase control and the swing phase control. In the stance phase control system muscle force around the hip joint and the prosthetic knee joint structure make the smooth progression of the center of gravity, keeping the knee joint stabilization. The control of the knee joint movement during the swing phase is required for the swing phase control system. In recent years various kinds of prosthetic knee joints have been commercially available, and the features of these joints and the prosthetic gait wearing them are explained.
