Sacral stress fracture in a marathon runner.

Athletically caused sacral stress fractures represent an uncommon reason for low back pain. The clinician must consider this possible diagnosis when evaluating patients with nonradicular low back or buttock pain. Women distance runners are more commonly afflicted. Athletically caused sacral stress fractures are most often unilateral. This case report presents an illustrative case of bilateral sacral stress fracture occurring in a male runner.