Stress fractures occur when abnormal stresses are placed on normal bone. The stress is often of a repetitive nature. Stress fractures were first described in military recruits and were named “march fractures.” Radiographs are frequently normal initially with the fracture not becoming evident until 10-20 days after onset of symptoms. A fracture can be visualized as a thin line of transverse or oblique radiolucency, as fluffy or compact periosteal callus without an obvious underlying fracture or as a band of increased density indicating healing. The most common sites of stress fractures are at the distal metatarsals, the tuberosity of the calcaneus, the diaphyses of the tibia and fibula, the neck of the femur and the pubic rami.