Acute Fractures and Dislocations of the Ankle and Foot in Children.

Distinct biologic and mechanical attributes of the pediatric skeleton translate into fracture patterns, complications, and treatment dilemmas that differ from those of adults. In children, increasing participation in competitive sports activities has led to an increased incidence of acute injuries that affect the foot and ankle. These injuries represent approximately 13% of all pediatric osseous injuries. Important posttraumatic complications include premature physeal arrest, three-dimensional deformities and consequent articular incongruity, compartment syndrome, and infection. The authors describe normal developmental phenomena and injury mechanisms of the ankle and foot and associated imaging findings; mimics and complications of acute fractures; and dislocations that affect the pediatric ankle and foot. Treatment strategies, whether conservative or surgical, are aimed at restoring articular congruency and functional alignment and, for pediatric patients specifically, protecting the physis. The different types of ankle and foot fractures are described, and the American College of Radiology guidelines used to determine appropriate imaging recommendations for patients who meet the Ottawa ankle and foot rules are discussed. The systems used to classify clinically important fractures, including the Salter-Harris, Dias-Tachdjian, Rapariz, and Hawkins systems, are described, with illustrations that reinforce key concepts. These classification systems aid in diagnosis and treatment planning, facilitate communication, and help standardize documentation and research. This information is intended to supplement radiologists' understanding of developmental phenomena, anatomic variants, fracture patterns, and associated complications that affect the pediatric foot and ankle. In addition, the role of imaging in ensuring appropriate treatment, follow-up, and patient and parent counseling is highlighted. RSNA, 2020.