DU-08 (Jin Suo) Sinew Contraction

What does DU-08 Jin Suo do?

Jin Suo DU-08 is the point on the Governing Vessel named for the thing it treats: jin suo means "Sinew Contraction", and this is the classical midline point for muscular spasm, contracture and rigidity. Sacred Lotus sources & references place it on the Du Mai below the ninth thoracic vertebra and record its actions as soothing the Liver, pacifying wind, relieving spasm and calming the spirit. The theoretical chain behind that is short and worth stating: the Liver is said to govern the sinews; internal wind arising from the Liver is the pattern invoked for sudden, involuntary, convulsive movement; and DU-08 sits at the level of the Liver's own Back-Shu point, one and a half cun to either side.

• Relieves spasm and contraction of the sinews — the action the name announces, and the reason the point exists in the repertoire. It is applied to rigidity and spasm of the back, to clenching and to convulsive movement generally.
• Soothes the Liver and pacifies wind — the pattern-level action. "Liver wind" in Chinese medicine covers the sudden and the convulsive: tremor, spasm, seizure activity, rigidity of the trunk. DU-08 is the Governing Vessel's principal point addressed to it in the thoracic region.
• Calms the spirit — the second recorded action, and the one behind its long association with epilepsy, mania and agitation. The Governing Vessel runs up the spine to the head, and the points along its upper reach are consistently credited with settling the spirit.
• Regulates the Governing Vessel and benefits the spine — the local and channel action, applied to stiffness and pain of the mid-back along the midline.
• Harmonises the middle burner — the recorded indication of gastric pain reflects the point's position at the mid-thoracic level, the segment the tradition associates with the stomach and diaphragm region, and the same reason DU-08 appears in the Governing Vessel prescriptions for digestive complaints described under research.

Source: Sacred Lotus sources & references (channel, existing action and indication records, and the BL-18 Gan Shu location, which is recorded as 1.5 cun lateral to Jinsuo DU-08); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 540); Chinese Acupuncture & Moxibustion (p. 230); cross-referenced against multiple online sources.

What is DU-08 Jin Suo used for?

DU-08 is used for spasm, rigidity and convulsive disorders, for stiffness and pain of the back along the midline, and for gastric pain. The indications below are those carried in Sacred Lotus sources & references and set out in the standard reference literature. They describe traditional use, not proven treatment.

• Epilepsy
• Stiffness of the back
• Spasm and contracture of the muscles of the back and trunk
• Rigidity of the spine, including opisthotonos — backward arching of the trunk
• Convulsions
• Gastric pain
• Jaundice, recorded in the reference literature for this segment of the Governing Vessel
• Mania, agitation and disturbances of the spirit
• Pain along the mid-thoracic spine

The list holds together better than it first appears. Epilepsy, convulsion, spasm and rigidity are one indication seen at different intensities — all of them "sinew contraction", which is the point's name. Stiffness and pain of the back are the local indication of a midline thoracic point. Gastric pain and jaundice belong to the segment: the ninth thoracic level is where the Liver and Gall Bladder Back-Shu points sit on either side.

Source: Sacred Lotus sources & references (existing indication and action records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 540); Chinese Acupuncture & Moxibustion (p. 230); cross-referenced against multiple online sources.

Where is DU-08 Jin Suo, and how is it used in practice?

Jin Suo lies on the midline of the back, in the depression immediately below the tip of the ninth thoracic spinous process — the bony knob of the ninth vertebra of the chest region, counted down the middle of the upper back. The practical way the point is found is by counting from a fixed landmark rather than from the neck: the seventh thoracic spinous process sits roughly level with the lower angle of the shoulder blade when the arms hang at the sides, so two spaces below that gives the ninth. Sacred Lotus sources & references supply an even more direct check — Gan Shu BL-18, the Liver's Back-Shu point, is recorded as lying one and a half cun lateral to Jin Suo DU-08. The two are on the same horizontal line, and that relationship is not incidental to the point's use; it is arguably the anatomical statement of it.

Which points is DU-08 combined with?

• With Gan Shu BL-18 — the pairing the anatomy hands you. The Liver's Back-Shu point sits either side of DU-08 at the same level. Where the Liver is held responsible for the sinews and for internal wind, treating the midline point and the Liver's own transport points together is the obvious structure, and it is the one the reference literature describes.
• With Yang Ling Quan GB-34 — the point that matters most for cross-reference here, because the two reach the sinews from opposite directions. GB-34 is the Hui-Meeting (influential) point of the Sinews, one of the eight influential points set out in the Nan Jing, and it governs tendons, ligaments and contractile soft tissue throughout the body as a tissue category. DU-08 addresses the sinews through the Liver and wind — spasm as a pattern of sudden involuntary contraction rather than as a tissue. A practitioner treating a stiff, contracted body will often use both: GB-34 distally on the lateral leg for the tissue, DU-08 on the midline for the pattern. The record held here for GB-34 sets out the influential-point scheme in full.
• With Zhi Yang DU-09 and Ling Tai DU-10 — the Governing Vessel points immediately above at the seventh and sixth thoracic levels. Needling a short run of adjacent Du points down the mid-back is a documented approach, and it is the method used in the Governing Vessel trials described under research.
• With Da Zhui DU-14 and Yao Qi — the combination for convulsive disorders. DU-14 at the base of the neck is the meeting point of the Governing Vessel with the six yang channels; Yao Qi is the extra point two cun above the tip of the coccyx that Sacred Lotus sources & references hold and that is classically associated with epilepsy. DU-08 with Yao Qi is the specific pair used in the animal study described below.
• With Tai Chong LIV-03 and Feng Chi GB-20 — the distal and upper points for Liver wind, added where tremor, spasm or convulsion is the presentation rather than local back stiffness.
• With Zhong Wan REN-12 and Zu San Li ST-36 — added where the gastric indication is the target rather than the sinews.
• Method — Sacred Lotus sources & references record moxibustion as applicable at this point, and moxa is the form in which DU-08 is used in the strongest clinical trial we could locate for it.

Where does DU-08 sit on the Governing Vessel?

The Governing Vessel runs up the midline of the back from the coccyx to the head, and its points below the neck sit one to a vertebral interspace. Sacred Lotus sources & references hold the whole run, and DU-08's neighbours locate it: Zhong Shu DU-07 below the tenth thoracic vertebra, Jin Suo DU-08 below the ninth, Zhi Yang DU-09 below the seventh — approximately level with the lower angle of the shoulder blade, which is the anchor from which the others are counted. Unlike the extraordinary-vessel Confluent points or the five-shu points, the thoracic Governing Vessel points carry no special classification in our data, and none is invented here: their identity comes from their name, their level and their documented use. DU-08's name is more informative than most, and the level it occupies — the Liver's segment — is the reason.

Source: Sacred Lotus sources & references (location, channel, the full Governing Vessel point run, and the BL-18, GB-34, DU-07, DU-09, DU-14 and Yao Qi point records queried and read directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 540); Chinese Acupuncture & Moxibustion (p. 230); Nan Jing (Classic of Difficulties), Difficulty 45, for the Hui-Meeting scheme; cross-referenced against multiple online sources.

Where is DU-08 located?

• A Manual of Acupuncture (p. 540): On the midline of the back, in the depression below the spinous process of the ninth thoracic vertebra.
• Chinese Acupuncture and Moxibustion (p. 230): Below the spinous process of the ninth thoracic vertebra.

How is DU-08 Jin Suo needled in the textbooks?

Stated plainly as documented fact: DU-08 is a midline point in the interspinous space below the ninth thoracic vertebra, and the structure deep to that space is the spinal canal — which at the mid-thoracic level still contains the spinal cord itself, not the looser cauda equina found lower down. The depth recorded in the texts is bounded, and the angle they describe is a shallow one that follows the gap between the spinous processes upward rather than driving straight in. Everything below is neutral reference data describing what the standard texts and the published literature record. It is not instruction, and this page does not teach technique. Needling is carried out only by a qualified, licensed practitioner.

• Depth documented: Sacred Lotus sources & references record 0.5 to 1.0 inch at DU-08, with moxibustion applicable. Deadman & Al-Khafaji (p. 540) record a comparable range.
• Angle documented — and a genuine difference between the sources. The record held here specifies perpendicular insertion; Deadman & Al-Khafaji describe oblique insertion angled superiorly at the thoracic Governing Vessel points. See the discrepancy note below. The anatomical reason for the upward angle is that the thoracic spinous processes slope steeply downward and overlap one another like roof tiles, so the gap between them opens upward — an obliquely superior needle follows that gap, while a perpendicular one meets bone sooner. Both figures are recorded; neither is presented as instruction.
• Discrepancy flagged. Our own record gives perpendicular insertion at DU-08 while Deadman & Al-Khafaji record oblique superior insertion at this and the neighbouring thoracic Governing Vessel points. We keep our recorded figure unchanged and set the difference out openly rather than silently harmonising the two. The same difference was found and flagged at DU-04 Ming Men in the lumbar region. A reader consulting more than one text at this point should expect to meet both descriptions.
• What lies beneath. Skin, the thin covering of the supraspinous ligament, then the interspinous ligament between the two spinous processes, then the ligamentum flavum and the spinal canal, containing the meninges and the spinal cord. The distinction from the lumbar points matters. In most adults the spinal cord terminates around the first to second lumbar vertebral level, below which the canal contains the cauda equina — a bundle of nerve roots that tends to be displaced by an advancing needle. At the ninth thoracic vertebra the cord itself is present, and the epidural space at thoracic levels is narrower than in the lumbar spine. That is why the thoracic midline points are described with a shallower, angled insertion than their lumbar counterparts, and it is a statement about anatomy rather than a caution added for form.
• Measured evidence on safe depth at Governing Vessel points — and exactly what it measured. A computed-tomography study of 32 adult volunteers, stratified by body type into thin, moderate and heavy groups, measured safe perpendicular needling depths at Governing Vessel points and found that safe depth differs substantially with body type: at Da Zhui GV-14 the measured figures ranged from about 32.9 mm in the thin group to about 47.9 mm in the heavy group (Li YD et al., Zhongguo Zhen Jiu 2005;25(12):863–4, PMID 16419711). The points measured were Da Zhui GV-14, Jian Zhong Shu SI-15, Xuan Shu GV-5 and Ming Men GV-4 — not Jin Suo GV-8. We do not claim otherwise. What carries across is the general finding that a textbook depth figure at a spinal midline point describes an average body, not a constant, and that in a thin person the same figure represents a much larger fraction of the distance available.
• What the case literature documents. Injury to the spinal cord, nerve roots and meninges from acupuncture needles inserted at or near the spine is recorded in the published case literature. A systematic review of 115 Chinese-language articles reporting 479 adverse events found subarachnoid haemorrhage among both the most frequent and the most serious traumatic complications, and concluded that most such events followed improper technique rather than acupuncture as such (Zhang et al., Bull World Health Organ 2010;88(12):915–921C, PMID 21124716, PMC2995190). A neurosurgical case report and literature review documents acute spinal epidural haematoma following acupuncture — a cervicothoracic epidural haematoma extending from C2 to T12 appearing hours after treatment — and notes that only six such cases were documented at the time of writing, that the bleeding is probably venous, and that the possibility makes acupuncture inadvisable in patients with coagulation disorders (Domenicucci M et al., World Neurosurg 2017;102:695.e11–695.e14, PMID 28377250). Neither report names DU-08 as the point involved, and we do not imply that it does.
• Honest limit of what we can source. We could not locate a published case report naming Jin Suo DU-08 specifically as the point at which a spinal injury occurred. Rather than assert one or leave the subject out, what is recorded here is what is documented: a bounded depth in the reference texts; the sources' description of a shallow angled insertion and the anatomical reason for it; the fact that the spinal cord itself lies at this level; measured evidence that safe depth at Governing Vessel points varies markedly with body type; and a published record of spinal injury from needling at and near the spine.
• Moxibustion — recorded as applicable, and worth noting because warming a midline point avoids the depth question entirely. The strongest clinical trial we could locate at this point used moxibustion rather than needling.

For proportion: a meta-analysis of prospective clinical studies estimated serious adverse events in acupuncture at approximately 1 per 10,000 patients and around 8 per million treatments, placing it among the safer treatments in medicine (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268). A bounded depth and an angled approach at a point like this one are part of the reason those figures look as they do.

Source: Sacred Lotus sources & references (existing needling record, kept unchanged); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 540); Chinese Acupuncture & Moxibustion (p. 230); PubMed PMID 16419711; PMID 21124716 (PMC2995190); PMID 28377250; PMID 34489268 — each verified resolvable and checked for retraction status before citation.

What does the name Jin Suo mean?

Jin Suo means "Sinew Contraction" — jin, the sinews, and suo, to contract, shorten or draw up. Sacred Lotus sources & references translate it exactly so. It is one of the small group of acupuncture point names that states a clinical condition rather than a landmark or a metaphor of terrain, and the name is the point's whole identity: DU-08 carries no five-shu, Connecting, Xi-Cleft or meeting classification in the data held here, so what it is known for comes from its name, its level and its recorded use. Jin is the same character that appears in GB-34's classification as the Hui-Meeting point of the Sinews, and it means more than "tendon" — it covers tendons, ligaments, fascia and the contractile soft tissue generally, everything that can shorten and draw a limb or the trunk out of shape.

Why is DU-08 the point for spasm and contraction?

Three things converge, and each is worth separating out.

• The name. Classical point names are not decorative; where a name states a condition, the tradition has attached the point to that condition from early on. "Sinew Contraction" is as explicit as point names get.
• The level. DU-08 sits below the ninth thoracic vertebra — and Sacred Lotus sources & references locate Gan Shu BL-18, the Liver's Back-Shu point, one and a half cun to either side of it, on the same line. The Liver governs the sinews in classical theory, and internal Liver wind is the pattern invoked for convulsive movement. A midline point flanked by the Liver's transport points, named for sinew contraction, is a coherent piece of design rather than a coincidence.
• The vessel. The Governing Vessel runs the length of the spine into the head and is the channel most associated with the spine itself, with rigidity of the back, and with the disorders of consciousness and convulsion for which its points are classically indicated. DU-08's recorded action of calming the spirit belongs to that group.

How does DU-08 differ from GB-34, the influential point of the Sinews?

This is the comparison worth making, because both points address the sinews and they are not interchangeable. Yang Ling Quan GB-34, below the outer side of the knee, is the Hui-Meeting (influential) point of the Sinews — one of the eight influential points set out in the Nan Jing, each governing one tissue or category throughout the body. GB-34 is selected because the problem is in the sinews as a tissue: contracture, stiffness, weakness, a frozen joint, wherever in the body it sits. It is a distal point on a limb and it carries a formal classification.

Jin Suo DU-08 reaches the same territory by a different route. It is a midline point of the Governing Vessel at the Liver's segment, and it is selected because the problem is read as Liver wind producing spasm — the sudden, involuntary, convulsive end of the spectrum, and rigidity of the spine and trunk in particular. It carries no formal classification at all.

In practice the two are complementary and are often used together: GB-34 for the tissue, DU-08 for the pattern and for the axial spine. The record held here for GB-34 sets out the eight influential points in full — GB-34 for the sinews, BL-17 Ge Shu for blood, LIV-13 Zhang Men for the zang organs, REN-12 Zhong Wan for the fu organs, GB-39 Xuan Zhong for marrow. DU-08 is not among them, and it should not be described as though it were.

Is there research on DU-08 Jin Suo?

There is no trial testing DU-08 alone, and none should be implied. There is, however, a reasonably large randomised trial in which DU-08 is the named anchor of the treatment, and an animal study in which it is one of four point pairs directly compared — which is more point-specific evidence than most Governing Vessel points have.

• Herb-separated moxibustion anchored at DU-08, randomised, 126 patients. Patients with diarrhoea-predominant irritable bowel syndrome of the "liver stagnation and spleen deficiency" pattern were randomised into three arms of 42: herb-separated moxibustion at Jinsuo GV-8 and the surrounding "eight-diagram" points, oral pinaverium bromide, or the Chinese herbal decoction Tong Xie Yao Fang — whose ingredients, ground to a paste, were the medium the moxa was applied over. Treatment ran eight weeks. Symptom scores, gastrointestinal symptom scores and IBS symptom severity scores fell in all three groups, and fell furthest in the moxibustion group; all eight subscales of the IBS quality-of-life instrument improved most in that group; the total effective rate was 92.9% against 71.4% and 73.8% (Hao LJ, Shi ZM, Zhongguo Zhen Jiu 2020;40(7):702–6, PMID 32648391). Two caveats matter. The comparators are active treatments rather than placebo and the trial is unblinded, so the effect size should be read cautiously. And the intervention is DU-08 plus a ring of surrounding points, with a herbal paste beneath the moxa — so the result belongs to the whole method. Even so, DU-08 is the point the method is named for and built around, and the condition treated is one its recorded indications reach by way of the Liver.
• Direct comparison of point pairs in experimental epilepsy. A rat study of electroacupuncture in kainic-acid-induced epilepsy compared four acupoint pairs at two stimulation frequencies: Shui Gou DU-26 with Da Zhui DU-14; Jin Suo DU-08 with Yao Qi (EX-B9); Nei Guan P-06 with Qu Chi LI-11; and Feng Long ST-40 with Yong Quan KI-01. Seizures were reduced at nearly every point pair and frequency; low-frequency stimulation worked best at ST-40 with KI-01; high-frequency stimulation was generally superior to low — with the single exception of Jin Suo DU-08 with Yao Qi, where the two frequencies did not differ. The authors concluded that the effect depends on both the points chosen and the stimulation parameters (Kang X, Shen X, Xia Y, Evid Based Complement Alternat Med 2013;2013:149612, PMID 23589718, PMC3622388). This is animal work and transfers to people only as a hypothesis — but the design compares DU-08 against other points rather than burying it in a protocol, and the pair tested is exactly the classical epilepsy pairing.
• DU-08 within Governing Vessel segment prescriptions. Two clinical trials of gastro-oesophageal reflux disease needled a defined run of the Governing Vessel across the dorsal segment from the third to the ninth thoracic level — Shen Zhu GV-12, Shen Dao GV-11, Ling Tai GV-10, Zhi Yang GV-9 and Jin Suo GV-8, together with intervening non-acupoints (Zhen Ci Yan Jiu 2016;41(2), PMID 27323443; and a companion trial in reflux cough, Zhen Ci Yan Jiu 2019;44(2), PMID 30945492). DU-08 is one point of five in a segmental method; the results belong to the segment, not to this point, and are listed to show where DU-08 appears in current practice.

The honest summary: DU-08's standing rests on its name, its position at the Liver's segment of the spine and long documented clinical use, with modern evidence that is suggestive at method level and preliminary at point level. It is not a heavily researched point and should not be presented as one.

How does DU-08 compare with the points around it?

Zhi Yang DU-09 lies two interspaces above at the seventh thoracic level, roughly level with the lower angle of the shoulder blade — the landmark from which DU-08 is counted, and the more used of the two for chest and diaphragm complaints. Zhong Shu DU-07 lies one interspace below at the tenth thoracic level. Ji Zhong DU-06, below the eleventh, and Ling Tai DU-10, below the sixth, complete the immediate run. Gan Shu BL-18 is DU-08's lateral partner at the same level — the Liver's Back-Shu point — with Dan Shu BL-19, the Gall Bladder's, one level below beside DU-07, and Ge Shu BL-17, the influential point of blood, two levels above beside DU-09. Further afield, Ming Men DU-04 at the second lumbar level is the Governing Vessel point DU-08 is most often compared with; it is the lumbar point for Kidney yang, not a sinew point, and the cord no longer lies within the canal at its level. And Yang Ling Quan GB-34 on the lateral leg is the other sinew point of the repertoire, treated at length above.

Source: Sacred Lotus sources & references (name, translation, channel, existing action record, and the BL-17, BL-18, BL-19, DU-04, DU-06, DU-07, DU-09, DU-10, DU-14, GB-34 and Yao Qi point records queried and read directly); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 540); Chinese Acupuncture & Moxibustion (p. 230); Nan Jing (Classic of Difficulties), Difficulty 45; PubMed PMID 32648391; PMID 23589718 (PMC3622388); PMID 27323443; PMID 30945492 — each verified resolvable and checked for retraction status before citation; cross-referenced against multiple online sources.