The reason for sore buttocks after lumbar spine surgery may be that the nerve damage has not recovered, the nerve compression has not been completely removed, etc. 1. After lumbar spine surgery, nerve compression is completely removed, but the damaged nerves have not fully recovered, and the innervated area of the buttocks will still have symptoms such as soreness and pain, which can be relieved slowly by applying hot compresses and taking nutritive drugs such as methylcobalamin. 2. During lumbar spine surgery, the intervertebral disc tissue is not completely removed, and part of the residual intervertebral disc tissue may lead to local nerve compression symptoms still exist, so there will be buttock soreness, and at this time, you can determine whether there is still nerve compression through MRI. Sore buttocks after lumbar spine surgery is recommended to go to the hospital in time to identify the cause of targeted treatment.