Difference between a triplane fracture and a juvenile Tillaux fracture of the ankle
Both fractures occur after partial closure of the distal tibial physis. On a frontal radiograph, a triplane fracture appears as a Salter III fracture through the epiphysis, and on a lateral radiograph, it appears as a Salter II fracture through the metaphysis. A juvenile Tillaux fracture is simply a Salter III fracture that occurs at the anterolateral aspect of the distal tibia. The physis fuses from medial to lateral, leaving the lateral aspect more vulnerable to injury.