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An open fracture is characterized by the bone breaking through the skin, which creates a direct connection between the external environment and the bone. This type of fracture is significant because it can lead to increased risks of infection due to the exposure of the bone and surrounding tissues to bacteria and contaminants. Open fractures often require immediate medical attention to clean the wound, stabilize the fracture, and implement appropriate treatment, which may include surgery.

In contrast, other types of fractures, such as those classified as simple or closed fractures, do not involve a break in the skin. Simple fractures may involve only a crack in the bone without any displacement or exposure, and they generally pose less risk of infection. Additionally, the time it takes for fractures to heal can vary widely; thus, a fracture that heals quickly does not characterize an open fracture. Similarly, even if there is soft tissue damage, if the skin remains intact and the bone does not protrude, it would not fall under the category of an open fracture.