Clinical Efficacy of Acupuncture on Rheumatoid Arthritis and Associated Mechanisms: A Systemic Review

This comprehensive systematic review examined 43 studies conducted between 1974 and 2018 to evaluate the clinical efficacy of acupuncture in the treatment of rheumatoid arthritis (RA) and its proposed mechanisms of action. Rheumatoid arthritis is a chronic autoimmune inflammatory disease that affects 0.2-1% of the population, causing persistent synovitis, joint destruction, and significant morbidity. The authors performed a comprehensive search across multiple databases including PubMed, EMBASE, Cochrane, and CNKI, analyzing both human and animal-model studies. The methodology included detailed analysis of study design, subject characteristics, interventions, acupuncture points used, assessment parameters, and proposed mechanisms.

Of the 43 studies analyzed, 33 were randomized clinical trials, 4 of them double-blind. The studies included both human patients with RA and animal models, primarily rats and rabbits with adjuvant-induced RA. Sample sizes varied significantly, with some studies including more than 100 participants. The most frequently used acupuncture point was ST-36 (Zusanli), followed by GB-34, LI-4, BL-60, and GB-39.

Protocols ranged from single points to more than 10 points, with treatment durations of 5 days to 3 months. Interventions included traditional acupuncture, electroacupuncture, laser acupuncture, moxibustion, and herb-point stimulation. The results consistently showed that acupuncture, whether alone or combined with other modalities, was beneficial for the clinical conditions of RA. Effectiveness rates ranged from 79.2% to 95%, depending on the modality used.

Notably, no adverse events were reported in any of the studies. Acupuncture demonstrated significant improvements in symptoms such as pain, morning stiffness, tender and swollen joint counts, and laboratory parameters including ESR, CRP, and rheumatoid factor. Several mechanisms were proposed to explain the therapeutic effects. The anti-inflammatory effect was the most frequently suggested mechanism, with studies demonstrating reduction of inflammatory cytokines such as TNF-α, IL-1, IL-6, and modulation of nuclear factor kappa B (NF-κB).

Regulation of immune function was another important mechanism, with studies showing alterations in immunoglobulins and immune cell function. Antioxidant effects were also proposed, including increased activity of superoxide dismutase and catalase. Some studies suggested central analgesic effects through increased endorphins in cerebrospinal fluid. The clinical implications are significant, suggesting that acupuncture may be a valuable complementary treatment modality for patients with RA, especially considering its safety and the absence of reported adverse events.

The review also highlighted the importance of Traditional Chinese Medicine theory in point selection and treatment protocols. However, the authors identified several important limitations, including inconsistencies in reported clinical efficacy and a paucity of well-designed double-blind studies. Standardization of treatment protocols remains a challenge, particularly regarding the application of TCM theory in contemporary research.