关节的两个环节可视为近侧环节和远侧环节．远侧环节的运动研究较多，但对近侧环节运动的研究还不多见．引起近侧环节运动的原因有别于远侧环节，近侧环节所产生的运动和由此带来的训练方法与远侧环节完全不同，因而不能因为它们的运动幅度相同而混为一谈 Two aspects of the joint can be considered as proximal and distal links. There are many studies on the movement of the distal part, but the research on the movement of the proximal part is rare. The cause of the proximal movement is different from that of the distal movement. The movement produced by the proximal movement and the resulting training method are completely different from the distal movement and can not be confused with the same magnitude of movement