Acupuncture for Rotator Cuff Tendinopathy: Meta-Analysis Shows Pain Reduction and Functional Improvement Comparable to Structured Physical Therapy

Rotator cuff tendinopathy is one of the principal causes of shoulder pain in adults, with high prevalence in populations active in manual labor, athletes with upper-limb overuse, and those over 50. Established conservative treatment combines progressive eccentric exercises, pharmacologic pain control (NSAIDs, acetaminophen), occasional corticosteroid infiltration, and — in selected cases — shock wave therapy. Rehabilitation is frequently prolonged, with significant rates of residual pain or refractoriness. Acupuncture, in its manual, electro, and dry (intramuscular dry needling) variants, has been investigated as an adjuvant or alternative in this scenario.

Consolidated Findings of the Meta-Analyses

Systematic reviews published in the last five years — with emphasis on network meta-analyses comparing various modalities — converge on a set of consistent findings: clinically significant reduction of pain compared with isolated standard care, with magnitude similar to that observed with structured physical therapy; improvement of functional scores (Constant-Murley and SPADI) compared with sham and isolated drug treatment; additive gain when acupuncture is combined with kinesiotherapy, compared to either intervention alone; and sustained effect in follow-ups of 12 to 24 weeks after the end of active treatment.

Plausible Mechanisms in Tendinopathy

Tendinopathy involves failure of the tendon remodeling process, with disorganization of the collagen matrix, aberrant neovascularization (with infiltration of nociceptive nerve fibers), and intermittent inflammatory component. Acupuncture — particularly dry needling of trigger points — may act through: segmental analgesic effect (gate control and descending modulation), deactivation of myofascial trigger points perpetuating pain, localized stimulation of tendon microcirculation with modulation of growth factors (VEGF, IGF-1, TGF-β), and reduction of local proinflammatory cytokines. Periarticular electroacupuncture may also modulate central sensitization frequent in chronic cases.

Positioning in Guidelines

International orthopedic guidelines (AAOS, NICE) recognize acupuncture as a reasonable option within conservative treatment of shoulder pain, especially in patients who do not respond adequately to physical therapy alone or who have contraindications to infiltrations. In sports medicine, dry needling is consolidated as a complementary technique to rehabilitation, with programs combining progressive eccentric exercises and deactivation of trigger points.