In the Dark Knight Rises movie, Bruce Wayne visits the doctor and is diagnosed with cartilage problems. That is, he has no cartilage. Is the knee bracing device that he uses meant to heal the cartilage or brace the knee or both? Is it a real medical device?
The knee brace was a nod to the comics where he had a cybernetic knee brace to help him walk. It is very much a piece of fictional batman technology and doesn't exist in real life.