Dry Needling for Lateral Epicondylitis (Tennis Elbow): Meta-Analysis Suggests Benefit on Pain and Function, with Magnitude Comparable to Structured Physical Therapy

Lateral epicondylitis — also known as tennis elbow — is one of the most common tendinopathies in active adults, with annual prevalence of 1% to 3%. The condition involves lateral elbow pain at the origin of the wrist extensors (especially the extensor carpi radialis brevis), with a degenerative tendinopathy component, microrupture, and — frequently — associated myofascial trigger points in the muscles of the posterior forearm. Standard treatment is conservative: ergonomic guidance, progressive eccentric exercises, NSAIDs in short course, unloading orthosis, and — in selected cases — corticosteroid infiltration or shock waves. Dry needling at myofascial trigger points has gained ground as an adjuvant technique.

What the Literature Shows

The meta-analyses converge on a moderate benefit of dry needling on pain and function compared to sham and to physical therapy alone. In head-to-head comparisons with corticosteroid infiltration, dry needling frequently presents an effect on pain of inferior magnitude in the short term (up to 6 weeks) but superior in the medium and long term (12-26 weeks) — reflecting the known tendency of corticosteroid infiltrations to offer rapid relief with worse long-term outcomes. The combination with progressive eccentric exercises appears to offer better results than any modality alone.

Mechanistic Plausibility

Dry needling at an active trigger point triggers a local twitch response (LTR) and appears to reduce peripheral and central sensitization via decreased release of substance P, CGRP, BDNF, and local inflammatory markers. There is also action on local microcirculation and potential stimulation of reorganization of the perimuscular fascial tissue. In imaging studies, reduction of tissue stiffness on elastography is observed after repeated sessions.

Limitations and Cautions

Limitations of the literature include heterogeneity of protocols, variability in selection and localization of trigger points (operator-dependent), and difficult blinding. The technique should respect the neurovascular anatomy of the forearm — deep needling in the radial canal may reach the deep branch of the radial nerve. Intramuscular dry needling, in the context of Brazilian medicine, is part of the scope of the physician (acupuncturist, orthopedist, sports medicine physician, physiatrist) trained in needling technique.