Cure? Surgeries can remove the extra bone, hip replacements are quite common, but his dance career at least at a professional level, is over. He could teach though. Hips have a number of specific things that can go wrong and each will have different impacts on different people and such. I also have bone growth that filled in the hip joint, but even removing that wouldn't make a difference. My hip never fit into the joint properly, so that would also have to be address, which leads into other issue that have come up, and so on. So I hobble along until they say it is bad enough that they now can replace it.