It is called a scaphoid fracture, also called navicular bone and indicating a bone in the wrist connecting to the bones of the forearm and other carpal bones (at the base of the hand), when this bone is broken after a violent shock. In most cases, the mechanism is a reception on the wrist or hand from a fall, or a sports injury... At the time, the pain is acute, wrist swelling and hematoma appears quickly. A radiograph made the diagnosis. In case of simple fracture should be plastering the thumb to the elbow to keep the forearm and wrist at a standstill. If the bone moves, it is then necessary to have surgery with the installation of screws or pins.