This a fracture that occurs in the apparently normal bone of a healthy person. This type of fracture is caused by repetitive minor stress, and not a single traumatic incident.
Sites of stress fractures are dependent on the activity that is causing the repeated stress. Some examples of associations between activities and sites of stress fractures are presented below:
Site | Activity |
humerus | cricket in adolescence |
tibia and fibula | long distance running |
metatarsals | marching |
pars interarticularis of the fifth lumbar vertebrae | gymnastics |
Stress fractures occur as a result of microfracture from repetitive loading below a single load fracture threshold. Histological changes develop prior to a microfracture; if load is not modified a complete fracture will occur (1).
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