An open fracture, also known as a compound fracture, is a serious injury where the bone breaks through the skin. This type of injury requires immediate medical attention to prevent infection and promote healing. Synonyms for open fracture include exposed fracture, penetrating fracture or visible fracture. Other terms that might be used interchangeably with open fracture might include compound open break, where the bone is not just visible but is also poking through the skin, or complex open fracture, if the bone is shattered into small pieces. Regardless of the term used, an open fracture must be treated urgently.