Ulnar Dysplasia | Nemours KidsHealth
Also Called: Ulnar Club Hand What Is Ulnar Dysplasia? Babies with ulnar dysplasiaare born with a short or missing ulnar bone. The ulnar bone is one of the two forearm bones. The short or missing ulnar bone causes the hand and wrist to turn outward toward the pinky side of the forearm. The hand, wrist,…