Explanation:Tibial shaft stress fractures are the most common stress fractures in long-distance runners. Repetitive loading leads to microdamage exceeding the bone's remodeling capacity. Athletes typically present with localized pain that worsens with activity. Early radiographs may appear normal, making MRI useful for diagnosis. Treatment usually involves rest, activity modification, and gradual return to training. Prevention focuses on training modifications and addressing biomechanical risk factors. Reference: Matheson GO. "Stress Fractures in Athletes." American Journal of Sports Medicine, 1987.