What defines a compound fracture?

A compound fracture is defined by the fact that the bone has broken through the skin. This type of fracture is also known as an open fracture, as it exposes the bone and surrounding tissue to the external environment. This exposure increases the risk of infection and may lead to more complicated healing processes.

In contrast, the other choices highlight different types of fractures. A fracture occurring on one side of the bone refers to a simple or incomplete fracture, while a fracture along the axis indicates a transverse or linear fracture. The option describing a bone that shatters into multiple pieces refers to a comminuted fracture. Each of these distinctions is important in understanding the various types of bone injuries and their implications for treatment and recovery.