IRCT20200628047936N1 IRCT 2020-09-27 Shahid Beheshti University of Medical Sciences Erector spina block in lumbar spinal surgery The Efficacy of Ultrasound Guided Erector spina block in postoperative pain reduction in lumbar spinal surgeries 2020-09-05 anticipated 40 Complete https://irct.ir/trial/49244 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Other, Randomization description: All the participants will be divided randomly by using random number table generated by excel software into two groups of intervention and control. Forty patients will participate in this study and 20 of them will be allocated to intervention and the other 20 will enter control group based on randomization numbers which will be generated by excel software, Blinding description: All participants and also data recording personal who will not be the same person who performs block, will not be informed about the group of each case. 3 Pain control after spinal surgery. Intervention 1: Intervention group:After induction of anesthesia and changing the position to prone the case group receive erector spina block under ultrasound guide with bupivacaine 0.25 % , 20 cc each side. Intervention 2: Control group: Due to ethics committee suggestion, we will not perform Erector Spinae block with placebo. Yes - There is a plan to make this available What will be shared: All data and results will be reachable without identification info. When: Data will be reachable 3 month after publication To whom: All academic researchers Conditions: Data can be used only for research and scientific purposes. Where to obtain: Requests should be sent via Email to arashtafrishi@gmail.com How to obtain: Requests should be sent via Email .We will try to provide requested data in 1 month. Comments: