A broken ulnar nerve is very difficult to restore. The ulnar nerve is a difficult nerve to regenerate, and even after a very delicate nerve anastomosis, it is very difficult to restore 100% of the function of the ulnar nerve. The vast majority will recover very well or relatively well, but basically not 100%. The ulnar nerve is one of the more difficult nerves in the body to recover, unlike the trigeminal nerve, which has a strong recovery ability and may recover on its own even if it is torn. However, the ulnar nerve is not 100% recoverable without surgery, and even if surgery is performed, it is not necessarily a complete recovery, but in most cases a partial recovery.