This study is a prospective double blinded randomized controlled study. It will be held on patients with failed back surgery syndrome aged between 20 and 70 years old, one group will receive ultrasound and fluoroscopy-guided injection of prolotherapy in caudal epidural space while the other group will receive ultrasound and fluoroscopy-guided injection of steroids in the caudal epidural space 40 patients will be included in each group
This study will be held on patients with failed back surgery syndrome, the investigators are comparing prolotherapy and steroids injections in caudal epidural space to relieve the pain