Surgery can repair missing cartilage. Still experimental in the US, has been done several times here. But nothing says that bruce had any surgery, if he had it would have been before the first fight, who knows... Regarding the displaced vertebra, well the injury should have been much more severe (), he was slammed on a knee with not only his full weight, something like 210 lbs in the suit, but Bane added some help to gravity, so he should have had a broken lower spine. But, assuming the basuit did provide some protection to his spine, it would have been more believable if the guy simply had bruce lying on his belly, pushed gently but firmly the vertebra back and left him flat for a while. For real he would have needed surgery, no doubt.