Trapped periosteum in a distal femoral physeal injury: magnetic resonance imaging evaluation

epiphyseal fractures are frequently associated with knee trauma during sports in children and adolescents. usually, salter-harris types i and ii fractures are conservatively treated. however, failed closed reduction of displaced fractures suggest the presence of trapped periosteum, with indication for surgery. the present report describes a case of salter-harris type i fracture of the distal femur in a child, complicated with trapped periosteum detected at magnetic resonance imaging.