A complete or incomplete fracture of a bone by an external blow is called a fracture. Closed fractures are classified according to whether the fracture end is in communication with the outside world: the fracture end does not pierce the skin and is not in communication with the air. Open fracture: the fracture end pierces the skin and is connected to the air. 1, open fracture The skin and mucous membrane near the fracture are ruptured, and the fracture is connected to the outside world The bladder or urethra rupture caused by the pubic bone fracture, and the rectum rupture caused by the tail bone fracture are open fractures. Because of the connection with the outside world, such fracture wounds and fracture ends are contaminated. 2. Closed fracture The skin or mucosa of the fracture is intact and does not communicate with the outside world. This type of fracture is not contaminated. Open fractures and closed fractures are classified according to whether the fracture is in contact with the outside world or not!