Dry Needling in the Management of Musculoskeletal Pain

This clinical review presents dry needling as an emerging therapeutic modality for the treatment of myofascial pain syndrome, a condition that affects up to 10% of the world's adult population. Myofascial pain originates from trigger points (MTrPs)—hypersensitive areas located in taut bands of skeletal muscle that, when stimulated, produce referred pain and a local twitch response. American epidemiological studies show that trigger points are the primary source of pain in 30-85% of patients seeking care for musculoskeletal pain. Dry needling uses acupuncture needles inserted directly into trigger points, based on the principles of conventional Western medicine.

The technique was developed empirically following Karel Lewit's 1979 observation that the therapeutic effect of trigger point injections was primarily due to mechanical stimulation by the needle rather than the injected substance. Two main conceptual schools emerged: the Gunn radiculopathy model, which proposes that myofascial pain always results from peripheral neuropathy, and the Travell and Simons trigger point model, which focuses on direct insertion of the needle into the trigger point to elicit local twitch responses. The effectiveness of dry needling has been evaluated in numerous randomized controlled trials and three comprehensive systematic reviews. A review of 23 studies concluded that direct needling of trigger points appears to be an effective treatment, although the hypothesis of efficacy beyond placebo is neither completely supported nor refuted by the evidence.

The most recent review, including seven clinical trials, suggested that direct needling was effective in reducing pain compared with no intervention. A Cochrane review of 35 studies on chronic low back pain found evidence of pain relief and functional improvement with the use of acupuncture compared with no treatment or sham therapy, although the effects were observed only immediately after the sessions and at short-term follow-up. Comparisons between superficial and deep techniques reveal that the deep method is superior for the treatment of pain associated with trigger points. Comparative studies have shown that, although both techniques provide pain relief, deep needling results in better long-term analgesic effects.

Superficial needling, inserted 2-10 mm in depth, is recommended in high-risk areas such as over the lungs and large blood vessels. Some studies suggest that adding paraspinal needling to trigger point treatment may be more effective than treating only the trigger points, although more research is needed to confirm this approach. Adverse events associated with dry needling are rare and generally minor. A prospective study of more than 229,000 patients reported that 8.6% experienced at least one adverse event, with 2.2% requiring treatment.

The most common effects include bleeding or hematoma (6.1%), pain (1.7%), and vegetative symptoms (0.7%). Only two cases of pneumothorax were reported. Basic training in dry needling generally consists of 32-hour courses, followed by additional practical modules. The technique is considered relatively easy to learn with appropriate training and can be applied by various healthcare professionals, including family physicians, rheumatologists, physiatrists, and physical therapists.