A classification system used to categorize growth plate fractures as one of five types based on the mechanism of injury and the relationship of the fracture line(s) to the epiphyseal plate. The original five types of fractures, since expanded by other authors, were type I a transverse fracture across the physis; type II — a fracture through the physis and metaphysis but not the epiphysis; type III — a fracture through the physis and epiphysis; type IV — an intra-articular fracture involving the epiphysis, physis, and metaphysis and type V — a compression on the epiphyseal plate.