Effect of Phonophoresis On Patients With Knee Osteoarthritis: A Systematic Review And Meta-Analysis of Randomized Controlled Trials

Phonophoresis is an alternative treatment for knee osteoarthritis. However, evidence supporting the advantages of phonophoresis remains inconsistent. This systematic review and meta-analysis was conducted to illustrate the effect of phonophoresis. The PubMed, Cochrane Library, and Embase databases were searched for relevant studies from the date of their inception to 28 June, 2021. The eligibility criteria were: (1) randomized controlled trials (RCTs); (2) patients diagnosed as having knee osteoarthritis; (3) treatment with either phonophoresis or therapeutic ultrasound with placebo gels; and (4) reporting clinical and functional outcomes. Continuous variables are expressed as standardized mean differences (SMDs) with 95% confidence intervals (CIs). Analysis was performed using RevMan 5.3 software. The analysis included nine RCTs covering a total of 423 patients. The intervention group significantly outperformed the control group in visual analog scale score [SMD = −0.65, 95% CI (−1.04, −0.25), P = 0.001], Western Ontario and McMaster Universities Arthritis Index (WOMAC) score [SMD = −0.71, 95% CI (−1.26, −0.16), P = 0.01], and walk test score [SMD = −0.67, 95% CI (−1.21, −0.13), P = 0.02]. As a result, phonophoresis might alleviate pain and improve function in the short term. Further high-quality, large-scale RCTs are required to confirm the benefits.