when my dad was younger he used to do tree work and had a lot of issues with his back going 'out' he quit tree work, and the pain and all was still ther, so he had his first surgery at about age. . .33(im guessing) and it was not good, he had 2 bulging, 1 herniated, and 1 slipped disc, so they went in and cut off the excess, that did not fix anything. at about age 34 or 35, he had a second surgery to fuse his spine with 8 screws and 2 rods, then they put a piece of bone from your hip in the gaps and in a sence, it 'welds' your spine solid. This was also not a sucess, the one screw got put through too far and he now has pemanent nerve damage and he is partially paralized in his right leg. No joke, if i tickle both feet he cannot feel a tickle sensation in the right foot.
NOW, on the other had, my grandpa had the same thing done, as fas are fusing and all that. . .and he is as good as new, The surgery is a blessing if you get a good doctor, my dad is now has permanent scarring on his nerves.