This is new for me. I was searching nerve regeneration and came across this site. Had surgery on S-1,L-5, in August. Had serious pain in buttocks, back of leg,calf, and foot. Struggled with strength tests and leg 2 inches smaller than other. had laminectomy, disc repair and dynamic stabilization. I no longer suffer from muscle spasms, do not use heating pad to sleep anymore, leg getting stronger,(only 1 1/2"smaller) but no answers on how long for nerve to come "back to life". Take anti-inflams for nerve inflammation and have some pain when sitting too long. Post op was excruciating, but would not hesitate to do again as relief from muscle spasms and numbness gives a new life.