Low-Level Laser Therapy for Fibromyalgia: A Systematic Review and Meta-Analysis

Shu-Wei Yeh, Chien-Hsiung Hong, Ming-Chieh Shih, Ka-Wai Tam, Yao-Hsien Huang, Yi-Chun Kuan
Pain Physician 2019, 22 (3): 241-254

BACKGROUND: Fibromyalgia is a chronic disorder characterized by widespread pain and tenderness. Low-level laser therapy (LLLT), an emerging nonpharmacological treatment, has been used for relieving musculoskeletal or neuropathic pain.

OBJECTIVE: The objective of this review and meta-analysis was to determine the efficacy of LLLT on patients with fibromyalgia.

STUDY DESIGN: This study involved systematic review and quantitative meta-analysis of published randomized controlled trials (RCTs).

SETTING: This study examined all RCTs evaluating the effect of LLLT on fibromyalgia.

METHODS: We performed a systematic review and meta-analysis of RCTs evaluating the effect of LLLT on patients with fibromyalgia. PubMed, EMBASE, and the Cochrane Library were searched for articles published before August 2018. RCTs meeting our selection criteria were included. The methodological quality of the RCTs was evaluated according to the Cochrane risk-for-bias method. Review Manager version 5.3 was used to perform the meta-analysis. The primary outcomes were the total scores on the Fibromyalgia Impact Questionnaire (FIQ), pain severity, and number of tender points. The secondary outcomes were changes in fatigue, stiffness, anxiety, and depression. Standardized mean difference (SMD), 95% confidence intervals (CI), and P values were calculated for outcome analysis.

RESULTS: We identified 9 RCTs that included 325 fibromyalgia patients undergoing LLLT or placebo laser treatment with or without an exercise program. The meta-analysis showed that patients receiving LLLT demonstrated significantly greater improvement in their FIQ scores (SMD: 1.16; 95% CI, 0.64-1.69), pain severity (SMD: 1.18; 95% CI, 0.82-1.54), number of tender points (SMD: 1.01; 95% CI, 0.49-1.52), fatigue (SMD: 1.4; 95% CI, 0.96-1.84), stiffness (SMD: 0.92; 95% CI, 0.36-1.48), depression (SMD: 1.46; 95% CI, 0.93-2.00), and anxiety (SMD: 1.46; 95% CI, 0.45-2.47) than those receiving placebo laser. Furthermore, when compared with the standardized exercise program alone, LLLT plus the standardized exercise program provided no extra advantage in the relief of symptoms. On the other hand, the results of the only RCT using combined LLLT/LED phototherapy showed significant improvement in most outcomes except for depression when compared to placebo. When compared with pure exercise therapy, combined LLLT/LED phototherapy plus exercise therapy had additional benefits in reducing the severity of pain, number of tender points, and fatigue.

LIMITATIONS: There were some limitations in this review, mostly because of the low-to-middle methodological quality of the selected studies; for example, there was no clear allocation process and only patients were blinded in most studies. In addition, one study used per-protocol analysis with a 20% loss to follow-up. On the other hand, the differences in laser types, energy sources, exposure times, and associated medication status in these studies may have resulted in some heterogeneity.

CONCLUSIONS: Our results provided the most up-to-date and relevant evidence regarding the effects of LLLT in fibromyalgia. LLLT is an effective, safe, and well-tolerated treatment for fibromyalgia.

KEY WORDS: Low-level laser therapy, fibromyalgia, meta-analysis, FIQ, pain, tender points,exercise.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"