Previously I asked a question about my horse having a bump on his back?

I had asked a question about my horse having a bump on his back and having trouble walking. The vet came out earlier this week to do an exam and said that he had a vertebrae out of linemen and that he would be okay after she put it back in (she has done chiropractic studies too). So she shifted his back and the bump went down almost instantly. After that he was walking a little bit better and it seemed to relieve a lot of the pressure and pain. The next day (he is still on stall rest with minimal turnout in the round pen) I went to feed him and he could barely move. He has his rump all hunched under himself and is standing on his toes with his hind feet. We call her back and told us to give him 2 weeks on bute and stall rest to see if he recovers, if not we will have to take him to Auburn to get him looked at. She said if he is not looking better within 2 weeks then he could possibly have a fractured vertebrae. If he does have the fracture I was told it would take months to heal and he would probably never be able to ride again. So the question is have you ever or do you know of someone with a horse that has a fractured vertebrae? Do you know anything about it? I have been looking up info about it but can't really find much. Just forums where people posted questions asking about what to do and stuff so if you know of a good link that explains it then that would be great too.