This entry discusses pediatric lower extremity injuries, with a focus on those injuries that are unique to children. Physeal and apophyseal injuries are the starting point. Buckle, greenstick, and bowing fractures are described, as are fractures secondary to higher energy forces. Injuries of the knee form a significant portion of the entry. The similarities and differences between acute and chronic injuries are noted; in many cases, this differentiation is made by history taking. Osteochondral injuries and injuries to the physeal plate are also addressed.