[puffnstuff]

An open fracture, also called a compound fracture, is an injury that occurs when there is a break in the skin around a broken bone. In order for an injury to be classified as a compound fracture, the outside air (and dirt and bacteria) must be able to get to the fracture site without a barrier of skin or soft-tissue. Therefore, a bone does not need to be through the skin in order for the injury to be called a compound fracture.

A fracture is a broken bone. A broken bone is a fracture.
People believe that a fracture is a "hairline break," or a certain type of broken bone, its not. A fracture and a broken bone are the same thing.
Both of these words mean that the normal bone structure has been disrupted.