I recently had an L3,4,5 fusion with a minimally invasive approach laminectomy. After the bone removal for the stenosis, the titanium clamps (not the rods) they palced in my back failed allowing the L3&4 vetibra to colapse and compress the disk, herneating it thus causing more pain. the fusion healed that way. If the Dr had used the more invasive approach of removing all the bone and replacing it with the rods screwed into the vertibra, it would have been much better. NOW they tell me. I have to undergo that corrective surgery now and am not looking forward to it. Make sure you understand the type of surgergy they are doing and what you have to do in recovery.