Effectiveness of Acupuncture for Lateral Epicondylitis: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

This comprehensive meta-analysis investigated the clinical efficacy of acupuncture for lateral epicondylitis, commonly known as tennis elbow. The condition affects approximately 1-3% of the general population and 7% of manual workers, characterized by pain over the lateral epicondyle of the humerus that worsens with activities involving gripping and lifting. The investigators conducted a systematic search of seven major databases, including PubMed, EMBASE, and Cochrane Library, covering publications from inception through May 2019. Ten randomized controlled trials involving 796 participants were included, with 431 in the acupuncture group and 365 in control groups.

The studies were published between 1990 and 2018, with sample sizes ranging from 22 to 147 participants and mean age between 36.7 and 52.5 years. The acupuncture methodology varied across studies, including traditional manual acupuncture and electroacupuncture, with different point protocols such as LI-4, LI-10, LI-11, SI-3, GB-34, and TE-5. The number of treatment sessions ranged from 3 to 10, with a median of 10 sessions. Control groups included sham acupuncture, medications (NSAIDs such as celecoxib and meloxicam), and injection therapy with corticosteroids.

Primary outcome measures were clinical efficacy rate and the visual analog scale (VAS) for pain. Results demonstrated significant superiority of acupuncture over controls. For clinical efficacy rate, acupuncture outperformed medications (RR=1.15; 95% CI: 1.02-1.31; P=0.02) and injection therapy (RR=1.17; 95% CI: 1.08-1.26; P=0.0001). Although it showed benefit over sham acupuncture, this did not reach statistical significance due to heterogeneity between studies.

In the VAS pain analysis, acupuncture significantly reduced scores compared with medications (MD=-1.44; 95% CI: -1.77 to -1.10; P<0.00001) and injection therapy (MD=-0.75; 95% CI: -1.42 to -0.07; P=0.03). Adverse events were minimal, reported only sporadically, such as pain during needle insertion. The methodologic quality of the studies varied significantly. Only three studies used adequately described randomization methods, and only four implemented appropriate blinding.

This limitation represents an important source of selection and performance bias. The evidence was classified by the GRADE system as moderate for clinical efficacy rate and low for VAS due to methodologic limitations. The clinical implications suggest that acupuncture offers a valid therapeutic alternative for lateral epicondylitis, especially considering the risks of adverse events associated with anti-inflammatory medications and corticosteroid injections. Acupuncture proved superior both for pain relief and for improvement in overall clinical efficacy.

The main limitations include heterogeneous methodologic quality of the studies, varied acupuncture protocols, small sample sizes, and insufficient follow-up to assess long-term effects. The authors emphasize the need for future clinical trials with greater methodologic rigor, including adequate randomization, allocation concealment, appropriate blinding, and larger samples to establish more robust evidence on the efficacy of acupuncture for this prevalent condition.