Chengjin Point (BL-56 / Tendon Support, also known as Shanchang, Zhichang)
Discover the exact location and acupressure method for Chengjin (BL-56 / Tendon Support). Learn its benefits for calf pain, leg cramps, lumbar and back pain, and hemorrhoids – plus classic combinations for comprehensive treatment.
Indications
Calf pain, gastrocnemius spasm (leg cramps), lumbar and back pain, hemorrhoids, lower limb bi-pain, and constipation.
Precise Location
On the posterior calf, on the line connecting Weizhong (BL-40) and Chengshan (BL-57), at the center of the gastrocnemius muscle belly, 5 cun below Weizhong.
Location Method
Sit upright with feet on the floor. Bring the five fingers of one hand together with the back of the hand against the calf, place the thumb at the popliteal crease (Weizhong) – the point is where the little finger rests at the center of the calf, the highest point of the gastrocnemius muscle.
Massage Method
Lightly hold the side of the calf with the thumb on the back and four fingers on the side, knead with the thumb pad. Apply to both sides for 1–3 minutes each. Therapeutic actions: Relaxes the sinews and unblocks the collaterals, strengthens the lumbar region and knees, clears intestinal heat.
Compatibility
Lower limb bi-pain: Combine with Huantiao (GB-30), Yinmen (BL-37), Weizhong (BL-40), Chengjin (BL-56), Yanglingquan (GB-34), and Kunlun (BL-60). Disease overview: Some patients present with severe pain in the lower extremities limiting movement; others have muscle pain (mainly in the gastrocnemius) leading to muscle atrophy and difficulty walking over time. Massage sequence: Press Huantiao, Yinmen, Weizhong, Chengjin, Yanglingquan, and Kunlun – 3 minutes each, twice daily morning and evening. Hemorrhoids: Combine with Chengshan (BL-57), Changqiang (GV-1), and Huiyang (BL-35). Sciatica: Combine with Mingmen (GV-4), Chengfu (BL-36), Yinmen (BL-37), Chengshan (BL-57), Chengjin (BL-56), Kunlun (BL-60), Jingmen (GB-25), Xuanzhong (GB-39), and Huantiao (GB-30). Lumbar and back pain: Combine with Weizhong (BL-40) and Shenshu (BL-23).
Efficacy & Actions
The Zhenjiu Jiayijing states: “In the center of the calf depression.” The Suwen · Cijin Lun states: “Needling into the calf causes swelling.” The Lingshu · Benshu states: “The branch of the Taiyang meridian, 5 cun above the ankle, branches into the calf and emerges at Weiyang.” Here, “Chang” refers to the calf. Regarding its efficacy, the Jiayi Jing states: “It treats cold bi-syndrome with spasms.” This is a very useful point for treating hemorrhoids, lumbar and back pain, and calf pain. This point belongs to the Foot Taiyang Bladder Meridian. It relaxes the sinews and unblocks the collaterals, strengthens the lumbar region and knees, and clears intestinal heat. It is a commonly used key point for treating lumbar, leg, and anorectal disorders. First documented in Lingshu · Benshu. “Cheng” means to bear or support; “Jin” refers to sinews and tendons. Located at the center of the calf, this point bears the qi of the sinews – hence the name Chengjin (Tendon Support). It is also known as “Shanchang” and “Zhichang.”
Contraindications
Located in the fleshy calf region, needling should achieve qi sensation – generally 0.8–1.2 cun vertically. Moxibustion is permissible and is especially suitable for cold-type spasms. Needling should avoid blood vessels and nerves.
