<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I had surgery on the 1952011 it was s1decompression and I still have a lot of pain in left buttock and left leg also 7days after op had a nerve block injection and still have pain and sometimes I think I have worst pain now then before op please help  <response>: I do not know the reason for the back surgery. I suppose due disc pathology or spinal stenosis in lower level of the backL4-5 and L5-S1. During surgery there might be touching of surgical instruments of the nerves which leads to edema and more pain which can last up to 3-4 weeks and treated by physio and painkillers. A more serious situation might be nerve damage due to edema or trauma to the nerve by the surgeon. To solve this an NMR after a period of 4 weeks needs to be done. Important is : do you have loss of power standing on heel or toesor sensory disturbance on the frontal or posterior part of your leg. 