at the base of the fifth metatarsal . Many of these may be radiographically occult or subtle , and MRI can be useful in making the correct diagnosis.
Some authors have suggested that as many as 50% of all sports injuries are secondary to overuse . Stress fractures are overuse injuries that occur in runners most commonly in the tibia and fibula , although foot or ankle stress fractures may occur in athletes [13,14], or as insufficiency-type fractures in postmenopausal women . MRI will demonstrate a marrow-edema pattern (Fig. 5) early in the course of a stress fracture , with sensitivity similar to radionuclide bone scan, and superior to radiography or CT . The fracture can often be demonstrated as a low signal-intensity line through the involved bone (Fig. 5).
Fig. 4. Sagittal FSE (A) and short tau inversion recovery (STIR) (B) images of the ankle demonstrate full-thickness cartilage loss in the posterior facet of the subtalar joint, with subchondral marrow edema pattern and subtalar joint effusion.
Marrow edema patterns in subtendinous locations have been demonstrated to be associated with abnormalities of the adjacent tendon in a significant percentage of cases .
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