Well, i’d say that it probably depends on the kind of damage, and how well it has healed. I could see a method similar to rebreaking bones that haven’t healed correctly (IRL), where a group of medical professsionals, magical and not, just hit you with an axe in the same spot, to try and get the spine to to heal before the surrounding tissue. Maybe.
I don’t find a disabilty appearing in fantasy surprising, but the uncured ones do surprise me. Or remedied ig. Prettu sure that if your setting can have a wheelchair, then theoretically you could stick Warforged legs onto that someone. Obviously not ideal, but it’d probably be an improvent for the person (in universe ofc)