If mbd caused damage that much, and is over 2ft.. It could very well be several years old.. mbd is caused by poor diet and improper lighting.. this stunts their growth and eventually their body pulls calcium from their bones to support vital biological functions.. whem this happens the bones become rubbery and ez to break.. hence the back damage. Bent backs, digits tails and jaw underbites present themselves.
SO this igs damage cannot be reversed, and has to be housed according to its disability. You will most certainly be making regular vet visits (trust me, its not cheap in many cases)... basically trying to say - make a judgment call on keeping alive or put down.. I admire people that pull these reptiles through, and in many cases they lead decent lives.. I also admire people that make the hard call to put them down, so more or less assess the situation and make your call it can come down to how much time and moola you can provide.