Primary outcomes in steroid injection and PRP injection
pain
The mean ± SD VAS scores for pain at baseline were 5.22 ± 1.34 and 4.77 ± 0.95 in PRP and SI groups, respectively with a group difference of 0.44 (95% CI: -0.04 to 0.93). The mean baseline pain scores were changed to 4.22 ± 1.04 in the PRP group and 3.14 ± 0.81 in the SI group in three months follow-ups with a group difference of 1.07 (95% CI: 0.67 to 1.47). Similarly, the baseline pain score was significantly decreased in the PRP group than the SI group (1.97 ± 1.13 versus 2.71 ± 0.94) with a group difference of -0.73 (95% CI: -1.18 to -0.28) in six months follow-up.The functional mobility measured with the AOFAS scores were 52.53 ± 14.87 and 58.14 ± 11.47 in PRP and SI groups, respectively with a difference of 0.44 (95% CI: -0.04 to 0.93) at the baseline study. The mean AOFAS score was improved to 63.80 ± 12.04 in the PRP group and 75.76 ± 7.18 in the SI group in three months with a group difference of -11.96 (95% CI: -16.22 to -7.69). Similarly, the AOFAS score was significantly increased in PRP than SI group (86.04 ± 7.45 versus 81.23 ± 9.60) with a group difference of 4.80 (95% CI: 1.15 to 8.45) in six months (Table 
Box and whisker plot showing the comparison of different outcome variables between PRP and steroid groups