The great release point of the back of the leg. Chengfu (BL-36) opens the Bladder Meridian along the entire posterior thigh, eases sciatic pain, relaxes the lumbar region, and gets the leg moving again when obstruction has settled in.
Contraindications
No specific contraindications are recorded in the sources for this point. Use standard clean needle technique and the depth indicated above.
Name & story
The name 承扶 Chengfu means something like "Receive Support" or "Supported from Below". 承 (chéng) means to receive or to bear, and 扶 (fú) means to support or to assist. The point sits at the very crease where the buttock meets the thigh — the fold that literally supports the weight of the body when we sit. It is as if the point marks the place where the body is held up from below, and in clinical practice that image holds true: Chengfu BL-36 supports and unblocks the whole back of the leg, receiving the descending Qi of the Bladder Meridian (BL) and carrying it downward.
Point family & character
Chengfu BL-36 belongs to the Bladder Meridian (BL), the longest channel in the body, which runs from the inner corner of the eye all the way down the back, through the buttock and the back of the leg, to the little toe. BL-36 sits at an important junction on that long journey — the very top of the posterior thigh — making it a natural gateway for treating obstruction anywhere along the back of the leg and into the lumbar region.
Five-element dynamics
The Bladder Meridian (BL) is a Water channel, and Water in Chinese medicine governs the flow of fluids, the freedom of movement, and the deep reserves of the body. When the channel is obstructed — by Cold, by Dampness, by Blood Stasis — pain and stiffness settle into the lower back and legs. Chengfu BL-36, sitting at the top of the thigh where the channel descends from the lumbar region, is perfectly placed to open that flow and let the Qi and Blood (Xue) move freely down the leg again.
Location
At the midpoint of the gluteal fold — the horizontal crease at the base of the buttock, exactly where the buttock meets the back of the thigh. The patient lies prone; the point is found in the centre of that crease.
Anatomy & fascia
The point lies in the gluteal fold, where the gluteus maximus meets the posterior thigh muscles. Beneath the surface lie the biceps femoris, the semitendinosus, and the semimembranosus. The sciatic nerve runs close by in this region.
Needling
The needle is inserted perpendicularly (straight in). A strong needle sensation — often a tingling or an aching that radiates down the back of the thigh toward the knee — is commonly obtained and is considered therapeutically useful, especially when treating sciatic pain.
Safe depth
1–2 Cun.
Moxa, cupping & Tui Na
Cupping and Tui Na massage along the back of the thigh complement needling well, especially when there is muscular tension or Cold and Dampness obstructing the channel. Gentle Moxa may be used when Cold is a component of the pain pattern.
Functions
Activates the Bladder Meridian (BL) and relieves pain; Removes obstruction from the channel; Relaxes the sinews of the posterior thigh and lumbar region; Benefits the lumbar region and legs.
Indications
Sciatic pain radiating down the back of the leg; pain and stiffness of the lumbar region and sacrum; pain, tension, or numbness in the back of the thigh; difficulty walking or bearing weight on the leg; haemorrhoids; constipation.
Mind & spirit (Shen)
While Chengfu BL-36 is not primarily a Shen point, the connection between chronic pain and the spirit is never far away in Chinese medicine. Long-standing sciatic pain or lumbar obstruction wears a person down — the inability to move freely, to walk without discomfort, to sit or stand at ease gradually erodes vitality and mood. By restoring free movement to the channel and relieving pain, Chengfu gives back ease and freedom, and with them a quiet return of energy and wellbeing.
Point combinations
With Weizhong BL-40 and Kunlun BL-60 — the classic "chain and lock" combination along the back of the leg for sciatic pain and Bladder Meridian obstruction, as described in classical sources. These three points together open the channel from the gluteal fold all the way to the ankle.
Clinical spotlight
Chengfu BL-36 is best known as a key point in the treatment of sciatica and posterior leg pain. The classical "chain and lock" method — linking Chengfu BL-36, Weizhong BL-40 and Kunlun BL-60 in one treatment — is a time-honoured strategy for opening the entire posterior channel when Qi and Blood (Xue) are obstructed along its length. Deadman's Manual of Acupuncture specifically names this combination for sciatic pain radiating down the back of the leg. The strong propagated sensation that often radiates down the thigh when this point is needled is itself considered part of its therapeutic action.
The golden tip
If you have tightness or aching in the back of the thigh, a helpful self-care approach is firm pressure or massage right at the centre of the gluteal fold — the crease where the buttock meets the thigh. Use a thumb or a massage ball and press steadily for one to two minutes. This can help release tension along the back of the leg and ease mild sciatic discomfort. For any significant or persistent leg or back pain, professional care is recommended.
For education only — not medical advice. Consult a qualified practitioner.