Sample size determination
SD
The sample size was calculated based on a similar study conducted by Jain et al. (2015) in Wrightington Hospital, Wigan, UK, where the mean ± SD of the American Orthopaedic Foot and Ankle Society (AOFAS) score in both PRP Vs steroid groups were 88.50 ± 13.52 Vs 75.07 ± 20.13, respectively [