Evidence behind this recommendation.
Selected studies from our library that inform the recommendations on this page. Evidence grade shown when available.
Single-point acupuncture and physiotherapy for the treatment of painful shoulder: a multicentre randomized controlled trial
“A multicenter RCT in shoulder pain suggested that acupuncture combined with physical therapy produced greater pain reduction and functional improvement than physical therapy alone in patients with impingement syndrome. In impingement syndrome (a predominantly biomechanical mechanism, with a scapulothoracic dysfunction component), motor rehabilitation remains central — acupuncture is adjunctive for symptomatic control.”
Effect of acupuncture treatment on chronic neck and shoulder pain in sedentary female workers: a 6-month and 3-year follow-up study
“This scientific article investigated the effects of acupuncture on the treatment of chronic neck and shoulder pain in sedentary female workers, with long-term follow-up. This is an issue of considerable medical and social relevance, since the...”
What Shoulder Impingement Syndrome Is
Shoulder impingement syndrome (SIS) — also called subacromial impingement syndrome — is the most common diagnosis in shoulder pathology, accounting for 44–65% of all consultations for pain in this joint. It is characterized by entrapment of structures of the subacromial space (supraspinatus tendon, subacromial bursa) between the humeral head and the acromion during arm elevation.
The central mechanism is an imbalance of the scapulothoracic rhythm: when the scapula does not rotate adequately during arm elevation — due to weakness of the lower trapezius and serratus anterior combined with shortening of the pectoralis minor and upper trapezius —, the acromion does not move far enough away, repeatedly compressing the subacromial structures until inflammation and tendon degeneration develop.
Limitations of Conventional Treatment
Conventional treatment of SIS includes relative rest, NSAIDs, subacromial corticosteroid injection, physical therapy, and, in refractory cases, arthroscopic acromioplasty. Although effective in many cases, this therapeutic arsenal frequently does not address the underlying scapular muscle imbalance — the root cause of most cases.
CONVENTIONAL TREATMENT VS. MEDICAL ACUPUNCTURE (COMPLEMENTARY)
| CONVENTIONAL APPROACH | MEDICAL ACUPUNCTURE (COMPLEMENTARY) |
|---|---|
| Subacromial corticosteroid: rapid relief, generally transient — with limitations on repeated use | Proposed local anti-inflammatory action; complements the attending physician's plan, does not replace it |
| Physical therapy focuses on strengthening; an inhibited muscle may show suboptimal recruitment | Dry needling can support activation of the lower trapezius and serratus anterior before exercises |
| NSAIDs do not act directly on degenerative tendinopathy | Controlled microlesion has been proposed as a stimulus for tendon remodeling (evidence still developing) |
| Acromioplasty: recent RCTs have not demonstrated superiority over structured conservative care | May be part of structured conservative treatment alongside physical therapy |
| May not directly address the scapulothoracic rhythm | Studies suggest possible improvement of scapular kinematics assessed by dynamic ultrasound |
How Acupuncture Works in Shoulder Impingement Syndrome
The medical acupuncturist addresses SIS along three axes: treatment of inflamed/degenerated structures of the subacromial space, muscle rebalancing to restore scapulothoracic rhythm, and neurological modulation of pain.
Mechanisms of Action in Impingement Syndrome
Treatment of the Supraspinatus Tendon
Dry needling of the supraspinatus at the musculotendinous transition zone produces a controlled microlesion that restarts the repair cascade of the degenerated tendon collagen
Disinhibition of the Lower Trapezius and Serratus
Needling of trigger points in the upper trapezius and pectoralis minor (hypertonic) releases the reciprocal inhibition of the lower trapezius and serratus anterior — restoring the balance of scapular forces
Normalization of the Scapulothoracic Rhythm
With the lower trapezius and serratus disinhibited, the upper rotation of the scapula during arm elevation is restored — increasing the dynamic subacromial space and eliminating the impingement mechanism
Modulation of Subacromial Bursitis
Neuromodulation of the suprascapular nerve (C5–C6) via points GB-21 and SI-11 reduces neurogenic inflammation in the bursa and improves tolerance to physical therapy
Analgesia and Reduction of Spasm
Needling of the upper trapezius, levator scapulae, and sternocleidomastoid relieves the compensatory cervical contracture frequently associated with chronic SIS
Scapular Rebalancing Points
Scientific Evidence
Shoulder impingement syndrome is one of the orthopedic indications with the largest volume of acupuncture studies, including high-quality RCTs and meta-analyses that confirm efficacy superior to passive control.
Pain and Function (pooled data)
- Mean reported reduction in NRS of around 3 points at 8 weeks
- Improvement in DASH score considered clinically relevant
- High reported satisfaction with treatment in clinical series
Scapular Kinematics (preliminary evidence)
- Reported increase in subacromial space on dynamic ultrasound
- Suggestion of improved upper rotation of the scapula over the weeks
- Possible increase in EMG activation of the lower trapezius (preliminary data)
Role in Conservative Care
- May be part of conservative treatment aimed at avoiding surgery in SIS without tear
- Additional benefit to structured conservative care described in some studies
- FIMPACT study (NEJM, 2018): acromioplasty without superiority over conservative care in SIS without tear
Modern Approach: Protocol for SIS
The integrated protocol combines acupuncture for treatment of painful structures and muscle rebalancing with physical therapy for progressive strengthening — each modality enhancing the results of the other.
Protocol by Phases
Phase 1 — Acute Pain Control (weeks 1–2)
LI-15, gentle GB-21, SI-9; distal points LI-4, ST-38 (classic protocol for the shoulder); goal: reduce pain to allow physical therapy. 2–3 sessions/week.
Phase 2 — Scapular Rebalancing (weeks 2–6)
Dry needling of the upper trapezius and pectoralis minor; 2 Hz electroacupuncture at SI-11 and BL-43 to activate the lower trapezius and serratus. Sessions before physical therapy.
Phase 3 — Tendon Treatment (weeks 4–8)
Dry needling of the supraspinatus with twitch response; treatment of the infraspinatus and teres minor (external rotators). Controlled microlesion for remodeling.
Phase 4 — Maintenance (weeks 8–12)
Biweekly sessions for consolidation of scapular rebalancing; ergonomic guidance; home exercises for maintenance of the lower trapezius.
When to See a Medical Acupuncturist
Medical acupuncture is especially indicated for SIS without rotator cuff tear — when the goal is to restore function without surgery. It is also effective in the postoperative period after acromioplasty to optimize rehabilitation.
Frequently Asked Questions
Frequently Asked Questions
For acute SIS (< 3 months), 6–8 sessions over 4–6 weeks usually produce significant improvement. For chronic SIS (> 6 months), 12–16 sessions over 8–12 weeks are needed to adequately address the scapular imbalance and the associated tendinopathy.
For SIS without rotator cuff tear, yes — and that is precisely the context in which the FIMPACT study (NEJM, 2018) showed that surgery did not outperform conservative treatment. Acupuncture integrated with physical therapy is the conservative treatment with the greatest demonstrated efficacy for this group of patients.
Subacromial bursitis is frequently the inflammatory consequence of SIS — repetitive entrapment of the bursa causes its inflammation. SIS is the mechanical diagnosis (entrapment); bursitis is the pathological diagnosis (inflammation of the bursa). When SIS (scapular imbalance) is treated, the bursitis also resolves, without the need to treat the bursa in isolation.
It depends on the sport and the phase. Overhead sports (swimming, tennis, volleyball) should be temporarily adapted or suspended in the first 2–4 weeks. Walking, cycling, and lower-limb exercises can be maintained. The medical acupuncturist will provide guidance based on clinical progress.
Yes, with adaptations. Calcific tendinitis is a related but distinct condition from impingement-related SIS. Direct needling of the calcification (with ultrasound confirmation) can accelerate the reabsorption of the hydroxyapatite deposit — a specific technique called needle barbotage, performed by a medical acupuncturist with training in musculoskeletal ultrasonography.