Pain in both thighs 5 mos after spinal fusion in s1 l4 . inject l3 4 only answer. ?inject there failed before operation.

Maybe: Unfortunately, spinal fusions are not as predictable as one would like. Usually a fusion is performed secondary to instability, or secondary to the need for a decompression of the nerves, potentially leading to instability. While the goal is improvement of the pain, there are usually residual discomforts, including thigh pains. Also, the fusion may put additional stress on the level above.