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The Effect of Corticosteroid Local Injection Versus Platelet-Rich Plasma for the Treatment of Plantar Fasciitis in Obese Patients: A Single-Blind, Randomized Clinical Trial.

Chronic plantar heel pain (CPHP) is one of the most common painful and disabling foot conditions, for which various treatments have been proposed. We aimed to investigate the efficacy of local injection of platelet-rich plasma (PRP) compared with the conventional method of local corticosteroid injection in obese patients who were resistant to other nonsurgical treatments. In this single-blind, randomized clinical trial, 32 obese patients with chronic plantar heel pain were randomly allocated to 2 groups of 16 participants each. In 1 group, 40 mg of dimethylprednisolone was injected once into the painful heel, whereas the other group received 3 separate injections of PRP, with each injection administered 1 week apart. The groups were compared at baseline and at 24 weeks after the injection, or course of injections, was administered. Exposures, total morning pain, and foot function index were not statistically significantly different between the groups at baseline; however, at 24 weeks after the treatment, final pain and morning pain scores were statistically significantly (p < .001) better in the corticosteroid group, and the mean foot function index scores were 65.4 ± 3.2 and 58.3 ± 2.9 (p < .001) in patients treated with corticosteroid and PRP, respectively. In obese patients with plantar fasciitis, injection with corticosteroid was more effective than PRP at reducing pain and improving function.