Extracorporeal shock wave therapy (ESWT) has been used since the 1990s to treat various musculoskeletal disorders, but there is considerable controversy regarding the effectiveness of ESWT. Our aim was to conduct a systematic review of randomized controlled trials (RCT) to investigate the effectiveness of ESWT for plantar fasciitis.

A comprehensive search was conducted via electronic databases including MEDLINE, Embase, the Cochrane Controlled trials register, and 5 Korean databases from inception date to April 2022. Two review authors independently assessed studies for inclusion and risk of bias, and extracted study data. Major outcomes were pain relief, function, and quality of life.

We identified a total of 48 RCTs comparing ESWT with corticosteroid injection (n=14), conventional therapies (n=19), and sham control (n=21). Most studies included participants with chronic heel pain diagnosed as plantar fasciitis. All trials were susceptible to bias. In terms of pain results, ESWT showed no significant difference when compared with the steroid injection group and the conventional therapy group, and significant pain relief was confirmed only compared to the sham control group (Mean Difference -1.71; 95% confidence interval [CI] -2.44,-0.98; I2=70%;). Functional outcomes were significantly improved in the ESWT group compared to the steroid injection group (standardized mean difference 0.45; 95% CI 0.27,0.63; I2=0%) and the sham control group (SMD 0.84, 95% CI 0.23,1.45; I2=91%), but no significant difference was found when compared to the conventional therapy group.

Based upon the currently available low certainty evidence because of wide clinical diversity and varying treatment protocols of included trials, ESWT is associated with improved function and may be associated with pain reduction in plantar fasciitis. Further evidence is needed from well-designed studies with a standard dose and treatment protocol.