Structure of the break: This is a fracture in which the bone breaks in to 3 or more pieces. More often than not the fracture is a compound fracture, with fragments of the bone piercing the skin.
Diagnosis: An X-ray is usually sufficient to diagnose the fracture, along with taking in to account how the injury occurred.
Cause: In order for the bone to shatter in such a way, a very forceful impact is needed, such as a car crash or severe fall.
Treatment: The comminuted fracture usually requires surgery to re-assemble the fragments of broken bone. The bone will also need to be immobilised, allowing time for the bone to heal.
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Fig.1 – Courtesy of Sjbrown, Wikipedia