Atypical Unilateral Sacral Stress Fracture in a Marathon Runner

Stress fractures are common overuse injuries in athletic population. They contribute to 15-20% of all cases in a sports medicine clinic [1,2]. These injuries occurs when a normal bone is exposed to excessive, repetitive forces leading to altered bone homeostasis with predominant osteoclastic function with osseous breakdown leading to micro fractures in the bone which may progress to a frank fracture line in the setting of continued exposure[3].