IRCT20151020024621N8 IRCT 2019-11-16 Iran University of Medical Sciences Effect of Shockwave and Corticosteroid in Coccydynia Comparison of Radial Extracorporeal Shockwave and Corticosteroid Injection In The Treatment of Patients With Coccydynia 2019-11-21 anticipated 36 Complete https://irct.ir/trial/41034 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Participants who will meet the inclusion criteria will assign into two groups using randomly generated treatment allocations produced by an analyst who is not engaged with the enrollment. َSealed opaque envelopes is a method of allocation concealment.Random allocations will be recorded on the card and cards will be placed in the envelops. During the enrollment of each participant, one envelop will be opened and allocation of that participant will be disclosed, Blinding description: physician who is in charge of outcome assessment and data analyser are blinded. blinding of participants could not be done dute the nature of interventions. 2-3 coccydynia. Intervention 1: Interُvention group: Radial Shock wave in coccyx area consecutive 3 sessions weekly with 2000 pulse, 5 Hz frequency, Energy bar 3-4. Intervention 2: Control group: corticosteroid injection : 1 cc triamcinolon acetonide in maximum tender area in sacrococcygeal joint or tip of coccyx. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information