Effectiveness of electrophysical agents in subjects with frozen shoulder: a systematic review and meta-analysis

This systematic review with meta-analysis aimed to assess the effectiveness of electrophysical agents in improving pain, function, disability, range of motion, quality of life, perceived stiffness, and time to recovery in subjects with frozen shoulder (FS).

A thorough search of MEDLINE, Cochrane Library, PEDro, and EMBASE yielded 1143 articles, of which 23 randomized controlled trials were included. Risk of bias (RoB) was assessed through Cochrane Risk of Bias 2 tool. The certainty of evidence was evaluated through the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE).

The analysis included a total of 1073 subjects. None of the studies were judged as low RoB. Potentially clinically significant differences were observed in pain at 6 weeks and 5 months after extracorporeal shockwave therapy (ESWT), and in disability up to 3 months with laser therapy, albeit with uncertain results due to the high RoB and to the study heterogeneity. Ultrasound (US) therapy did not yield significant differences in any outcomes. The certainty of evidence was very low.

Based on the high heterogeneity and low quality and certainty of evidence, ESWT, laser, and US cannot be recommended for FS treatment. Caution should be exercised in interpreting the findings.