Causes of Nonunion
Author: Dimitrios Giotikas MD, PhD
Nonunion happens when the bone lacks adequate stability, blood flow, or both. Hence, it is more likely if the bone breaks from a high-energy injury, such as in a car accident, because these fractures are more unstable by configuration, more difficult to fix, with more impaired blood supply to the broken bone because of the surrounding muscle injury and, finally, more prone to develop infection.
Several factors increase the risk of nonunion.