“Cheng” here means to support or to hold. “Jin” means tendons. Stimulating the point can strengthen (support) the function of the leg so as to support the body, hence the name Chengjin (Supporting Tendon).
Midway between Heyang (BL55) and Chengshan (BL57).
- Spasm of the tendons of the leg.
- Stiffness and motor impairment of the lower back.