That's the thing about terrorists, they are incredibly insensitive. I have 5 discs in various stages of degradation but my last one which I believe is L5/S1 is gone. The report said the disc is ruptured and the material has leaked out. The get better as you go up but the bottom is obviously the worst. I had 2 different neurosurgeons look at me and they wanted to fuse me but that would be 7 vertebrae (1 above and 1 below) and that would be this cage like thing and I was like, "nah bro, I'm good". So for the last 8 years or so, I have done injections which worked well for me. But, as with all things, the inevitability of needing something done is coming and now I am seeing this new disc replacement stuff and it looks promising as the FDA (if you trust their data) claims a 90% success rate.
https://www.youtube.com/watch?v=50bRUcOGxHA
This one of the animations.
~PM