EffectivenessofDryNeedlingforUpper-QuarterMyofascialPain:ASystematicReviewandMeta-analysis

Myofascial pain syndrome (MPS) is a common condition characterized by hyperalgesic zones in muscle called myofascial trigger points. When pressed, these active trigger points cause local or referred pain, along with other symptoms like reduced range of motion and increased sensitivity to stretch. Dry needling is a treatment approach where an acupuncture-like needle is inserted directly into a trigger point with the goal of reducing pain and restoring movement. Despite its growing use in clinical practice, questions remained about how well dry needling actually works, particularly for pain in the upper quarter of the body (neck, shoulder, and upper back region).

This systematic review and meta-analysis was conducted to gather and analyze the best available evidence on whether dry needling effectively reduces pain in patients with upper-quarter MPS.

The researchers conducted a comprehensive electronic literature search using the keyword "dry needling" across multiple databases including MEDLINE, PubMed, and HealthSTAR, covering publications from 1946 through July 2012. They also performed hand searches of reference lists from other systematic reviews to identify additional relevant studies. To be included, studies had to involve human subjects, be randomized controlled trials, include a dry needling intervention group, and focus on myofascial pain involving the upper quarter. From an initial pool of 246 articles, 12 randomized controlled trials ultimately met all inclusion criteria.

Each included study was independently assessed for internal validity by at least three reviewers using the MacDermid Quality Checklist, a 24-item tool with a maximum possible score of 48 points. The researchers then performed four separate meta-analyses using a random-effects model: (1) dry needling versus sham or control immediately after treatment; (2) dry needling versus sham or control at approximately 4 weeks; (3) dry needling versus other treatments immediately after treatment; and (4) dry needling versus other treatments at approximately 4 weeks. Pain measured on a visual analog scale was the primary outcome across all analyses.

The methodological quality of the 12 included studies varied considerably, with MacDermid Quality Checklist scores ranging from 23 to 40 points, with a mean of 34 points. The highest quality studies were those by Tekin et al (40 points), Ga et al (39 points), and Irnich et al (39 points), while the lowest quality was Chu (23 points).

For dry needling compared to sham or control immediately after treatment, four studies were included in the meta-analysis. The overall effect size was 1.06 (95% CI: 0.05, 2.06), indicating a large effect favoring dry needling. However, heterogeneity was very high (I² = 86.3%). Three of four studies favored dry needling, though raw between-group differences in pain scores were of questionable clinical meaningfulness in two studies.

For dry needling compared to sham or control at 4 weeks, three studies were included. The overall effect size was 1.07 (95% CI: –0.21, 2.35), again suggesting a large effect favoring dry needling, but with a wide confidence interval that crossed the line of no difference. Heterogeneity remained high (I² = 84.2%). Two of three individual studies showed large effects favoring dry needling with clinically meaningful raw between-group effect sizes of 3.1 and 3.6 VAS points.

When dry needling was compared to other treatments immediately after treatment, two studies showed a moderate effect (–0.64, 95% CI: –1.21, –0.06) favoring other treatments (lidocaine injection and nonlocal acupuncture) over dry needling, with high heterogeneity (I² = 90%).

When compared to other treatments at 4 weeks, six studies showed essentially no overall difference (–0.07, 95% CI: –1.39, 1.26), with extremely high heterogeneity (I² = 95%). However, individual studies showed that lidocaine injection and botulinum toxin injection may be more effective than dry needling for pain reduction, while dry needling appeared superior to standard rehabilitation in stroke patients with shoulder pain.

Funnel plots showed asymmetry for three of four meta-analyses, suggesting potential publication bias, though this was difficult to interpret conclusively due to the small number of studies and high heterogeneity.

Based on the best currently available evidence, the authors issued a grade A recommendation for using dry needling, compared to sham or placebo, to decrease pain immediately after treatment in patients with upper-quarter myofascial pain syndrome. They also cautiously issued a grade A recommendation for dry needling at 4 weeks, though this was tempered by the wide confidence interval in the meta-analysis. These recommendations are significant because they represent the highest level of evidence-based support for dry needling in this patient population.

For patients, this means that dry needling is a reasonable treatment option to consider for neck, shoulder, and upper back pain related to myofascial trigger points, particularly when rapid pain relief is desired. The treatment appears to work better than sham or placebo procedures, suggesting that the specific effects of needle insertion into trigger points matter beyond any general placebo response.

For clinicians, the findings support incorporating dry needling into treatment plans for upper-quarter MPS, while acknowledging that the evidence base is still developing. The review also highlights that lidocaine injection may be superior to dry needling for longer-term pain reduction, which may influence treatment selection in some cases. The importance of eliciting a localized twitch response during dry needling was noted as a potentially important factor for treatment success, though more research is needed to confirm this.

The authors emphasized that additional well-designed randomized controlled trials are needed to strengthen these recommendations, particularly studies with larger sample sizes, appropriate power analyses, longer follow-up periods, and more consistent control conditions. Future research should also better address whether the localized twitch response is a necessary component of effective dry needling treatment.