I had my L5-S1 disc replaced in my early twenties, it is surprising how much pain you can get used to when it comes gradually.
My pain started before I was 20 but was tolerable and just gradually got worse, at twenty I saw a surgeon who said he could fuse the vertebrae together which would remove some of my flexibility but he said it was unlikely to help the pain! I basically said thanks but no thanks and with the thought that surgery couldn't help I put up with it as it got worse and worse. (I wasn't overweight at that time) I eventually got to the stage where it really affected everything I did, I couldn't walk far, driving was a nightmare and if I sat down at lunch time I couldn't get back up and had to roll across the floor to get to bed. I knew I had to get something done but was still holding off because of a lack of confidence of a good result.
Then I had a friend who had a disc replacement (all the surgeons I had talked to said there was no such thing as a disc or vertebrae replacement and said fusing was the only thing that could be done) and he was back to pain free life almost immediately post op and he gave me his Dr's name. It all went well from there, a phone call later and I organised a copy of my X-rays to be sent to him which was followed by a call back with a fairly prompt appointment time.
At my appointment was told very confidently "yes it can be fixed by replacing the dodgy disc, I can fit you in tomorrow afternoon seeing as you have travelled a fair way. You will just have to organise to stay up here (Gold Coast) for two weeks post op, you can have a little time to decide if you like" I looked at my wife and she looked at me and I said yep lets do it.
One night in hospital and I can still remember my first walk post op, the physio led me straight to the stairs and helped me down, I automatically favoured my bad side due to habit and she scolded me and made me descend one foot after the other and I was absolutely gob smacked that I could do it with no pain whatsoever! After my two week check up I drove from the Gold Coast back to hillston Nsw and after another few days I was back on a motorbike mustering.
It is absolutely amazing what can be done, having said that I am extremely glad I had kept my private health insurance up to date, it still costed enough but is the best money I have ever spent.
Your back is extremely important, don't let any sugeon fuse you up without a second opinion!
And a shameless plug for Dr Matthew Scott-Young of Gold Coast spine! 07 5528 6477
Just looked at my card, that was in 2008 so 8 years on and no pain.