Electroacupuncture Shrinks Torn Shoulder Tendon in Striking Case Report

A single case report published in the open-access journal Clinical Case Reports has drawn attention for an unusual reason: after a structured course of electroacupuncture, a 47-year-old nurse with a partial-thickness tear of her supraspinatus tendon not only recovered pain-free shoulder function, but follow-up magnetic resonance imaging suggested that the tear itself had shrunk from nine millimeters to roughly four. The report, authored by a team of Iranian rehabilitation researchers, is careful to stress that one uncontrolled patient cannot prove causation, yet the combination of objective imaging changes and dramatic clinical gains has made the case a talking point among clinicians searching for alternatives to surgery and steroid injections for one of the most common shoulder injuries in the workforce.

Rotator cuff tears are arguably the defining musculoskeletal complaint of middle age. The supraspinatus, the tendon that runs over the top of the shoulder and helps lift the arm away from the body, is the structure most frequently involved. Population studies cited in the report indicate that around twenty percent of people in their sixties carry a rotator cuff tear, a figure that climbs past fifty percent by the eighties. Complete tears often end in the operating theater, but partial-thickness tears occupy an uncomfortable middle ground: there is no consensus on the optimal management strategy, and conventional conservative treatments, including rest, physical therapy, non-steroidal anti-inflammatory drugs, and corticosteroid injections, leave a substantial share of patients with persistent pain and functional limitation. Studies referenced by the authors suggest that up to forty percent of patients fare poorly with these standard approaches, and corticosteroid injections, while offering short-term relief, have been linked in the literature to potential detrimental effects on tendon healing and structural integrity.

The patient at the center of the report was, in many respects, the archetype of this treatment-resistant group. A right-hand-dominant nurse, she had endured twenty-four months of left shoulder pain, on her non-dominant side, driven in part by the repetitive overhead reaching, lifting, and patient-transfer demands of her profession. Her baseline magnetic resonance imaging confirmed a nine-millimeter partial-thickness, articular-sided tear of the supraspinatus tendon, with the remainder of the shoulder unremarkable: no significant bursal thickening, a normal biceps tendon, and an intact acromioclavicular joint. Before electroacupuncture was considered, she had already failed an extensive conservative program, including twelve weeks of structured physiotherapy with ultrasound therapy, manual therapy, and rotator cuff strengthening, six weeks of twice-daily oral diclofenac, and two subacromial injections of methylprednisolone administered two months apart. She was selected retrospectively from routine clinical practice because she met predefined criteria, including complete adherence to treatment and comprehensive clinical and imaging follow-up, and she provided written informed consent for both treatment and publication.

The intervention itself combined a twelve-session electroacupuncture protocol with a daily home exercise program, and the technical details are what give the report its scientific texture. An expert physiotherapist trained in acupuncture inserted single-use stainless steel needles, 0.25 millimeters in diameter and 30 millimeters long, at four shoulder points: Large Intestine 16, Triple Burner 14, Small Intestine 10, and an Ashi point at the tip of the coracoid process, which corresponds anatomically to the region of the supraspinatus insertion and was chosen for focal stimulation. The point selection followed traditional meridian theory and previously published protocols for shoulder disorders, with LI-16 and TB-14 serving as local points and SI-10 as an adjacent one. Electrodes connected LI-16 and TB-14 together, and SI-10 to the coracoid-tip point, delivering a symmetric biphasic pulsed current at a fixed frequency of 5 hertz for twenty minutes per session, with sessions twice weekly.

Current intensity, capped at five milliamperes, was titrated individually to produce a strong but comfortable, non-painful paresthesia, the sensation known in traditional practice as De-Qi, without triggering forceful muscle contractions. Safety considerations were explicit: because the shoulder points lie near the thorax, needle angle and depth at LI-16 and TB-14 were carefully controlled to avoid pleural puncture, and needles were never oriented transversely toward the rib cage. Alongside the needling, the patient followed a phased home program: pendulum exercises and passive range-of-motion work with a cane or pulley in the first two weeks; scapular retraction, isometric holds, and elastic-band rotation exercises from weeks three to six; and a maintenance regimen of strengthening three to four times weekly thereafter. She documented adherence above ninety percent during the active treatment phase, modified her work duties temporarily, and received no oral analgesics, anti-inflammatories, or injections during the treatment period, a detail that strengthens the temporal association between the intervention and her recovery.

The outcomes were striking by any measure. Pain on the numeric rating scale fell from eight out of ten at baseline to three out of ten at week six, and to zero at the six-month follow-up, a one hundred percent reduction. The Disabilities of the Arm, Shoulder and Hand questionnaire score improved from 72.5 to 28.3 at week six and 12.3 at six months, an overall eighty-three percent improvement that far exceeds the established minimal clinically important difference of 10.8 points for shoulder disorders. Range of motion improved across every plane tested: active abduction rose from 95 to 160 degrees by week six and 175 degrees at six months, flexion from 100 to 180 degrees, and external rotation from 25 to 60 degrees. She returned to full work duties by the three-month occupational review, achieving precisely the goals she had set for herself: pain-free work and avoidance of surgery.

The most provocative finding, however, was structural. A repeat magnetic resonance scan at six months, acquired with identical imaging parameters on the same 1.5-Tesla scanner, using oblique coronal T2-weighted fat-suppressed fast spin-echo sequences with 3.5-millimeter slice thickness, showed an estimated reduction in tear dimensions from nine millimeters to approximately four millimeters in the oblique coronal plane. The reviewing shoulder-fellowship-trained orthopedic surgeon also noted a qualitative reduction in T2 signal hyperintensity within the tendon, potentially consistent with decreased tendinosis, although the authors emphasize that signal intensity was assessed descriptively and not normalized to a reference tissue. No progression of the tear or new pathology was identified, and the patient reported no adverse effects beyond mild, transient soreness at the needle sites after the first two sessions, which resolved within twenty-four hours.

The authors are candid about the caveats, and they are substantial. Measurement of partial-thickness tears is inherently variable, depending on slice selection, sequence parameters, and reader interpretation, and the reviewing surgeon was not blinded to the time point. More fundamentally, the concurrent home exercise program is the report’s most significant confounder: because electroacupuncture and exercise were delivered as a multimodal package, it is impossible to isolate the specific effect of either component. The improvements may reflect synergy, or they may have been driven primarily by the rehabilitative exercises, with electroacupuncture providing adjunctive pain relief that facilitated adherence. Natural healing, placebo effects, and regression to the mean all remain possible in an uncontrolled single-patient design, and the specific protocol, including point selection, frequency, and treatment dose, has not been systematically optimized.

Nevertheless, the case gains plausibility from a growing body of mechanistic work on electroacupuncture and tendon biology. In a rat model of Achilles tendon rupture, researchers found that electroacupuncture increased fibroblast proliferation, collagen synthesis, and the mechanical strength of healing tendons. Separate animal work on rotator cuff injury reported reduced levels of the inflammatory cytokines interleukin-1 beta and tumor necrosis factor alpha, alongside increased anti-inflammatory interleukin-10, potentially creating a more favorable environment for repair. Other studies have shown that electroacupuncture modulates matrix metalloproteinase activity, enhancing extracellular matrix remodeling, and that electrical stimulation more broadly promotes cellular migration, local blood flow, and growth factor production in connective tissue. The 5-hertz frequency used in this case aligns with research suggesting that low-frequency stimulation optimally triggers endorphin and growth factor release relevant to tissue repair.

Where the case fits into the broader evidence base remains an open question. Prior trials of acupuncture for shoulder pain have generally addressed mixed etiologies rather than imaging-confirmed rotator cuff tears, though meta-analytic evidence suggests acupuncture adds benefit to exercise-based physical therapy compared with exercise alone, and conventional non-operative care for small supraspinatus tears typically yields satisfactory outcomes in roughly seventy-five percent of patients, but over three to six months and with residual symptoms common. The authors call for randomized controlled trials comparing electroacupuncture against standard conservative care and sham acupuncture, incorporating both clinical and imaging endpoints, exploring dose-response relationships, and correlating biomarkers of tissue healing with outcomes to identify likely responders. Until such studies exist, this single nurse’s recovery, from eight-out-of-ten pain and a nine-millimeter tear to zero pain and a four-millimeter residual defect, stands as an intriguing, rigorously documented hypothesis generator rather than a practice-changing result, and a reminder that even ancient techniques can still surprise modern imaging.

Subject of Research: Electroacupuncture treatment of partial-thickness supraspinatus tendon tears

Article Title: Therapeutic Effects of Electroacupuncture on Partial‐Thickness Supraspinatus Tear: Clinical Case Report

Article References: Hajvalie, G., Takamjani, I. E., Sarrafzadeh, J., Saremi, H., & Asadi, M. R. (2026). Therapeutic Effects of Electroacupuncture on Partial‐Thickness Supraspinatus Tear: Clinical Case Report. Clinical Case Reports, 14(10), Article e73685. https://doi.org/10.1002/ccr3.73685

Image Credits: AI Generated

DOI: 10.1002/ccr3.73685

Keywords: electroacupuncture, supraspinatus tear, rotator cuff, shoulder pain, tendon healing, MRI, case report, physical therapy, DASH score, regenerative medicine, musculoskeletal disorders, Therapeutic