Im not really sure..It just started to hurt one day and slowly got worse..I thought it was just a pulled muscle because I worked at a roofing supply company and did a lot of heavy lifting..Woke up one morning and couldn't move..Went to the dr. and he sent me for some tests and found that a I had blown out my L4/L5 disc..Sucky thing is, is if I'd have went to the dr. when it first started hurting I could have done therapy and fixed it..But I waited almost 2 months..By the time he found the problem I had already done permanent nerve damage to the nerve that goes all the way down the back of my leg..So no more running, jumping, lifting or anything strenuous cause my leg is permanently weak..Plus I had 1 surgery to remove the disc, then a 2nd surgery to fuse my spine when the 1st surgery failed, then a 3rd surgery to remove the bone stimulator for the fusion and clean up scar tissue..But all of that didnt work so now I have a sometimes gimpy leg, a back that is in constant pain and doesnt bend right, severe arthritis in the lower spine area, and a couple other health issue that stem from the bad back..I know that was a long read but you asked for it..LOL