<--------- Degenerated discs between the L4 and L5 and L5 and S1. Doctor wanted to do surgery on them 2 years ago. Still playing hockey and working out. Sciatic acts up from time to time. If you back is locking up it's a nerve problem usually. Chiropractic and massage will help alot if done togetherbut you need to loosen up the muscle and tissue long term.