In which type of fracture does separation of the physis occur without fragmentation?

The separation of the physis without fragmentation is characteristic of a Salter-Harris Type 1 fracture. This type of fracture specifically involves the growth plate (physis) and occurs entirely through the physis, leading to a separation from the metaphysis. Since the Salter-Harris classification focuses on how fractures affect the growth plate in children and adolescents, this type is particularly significant because it does not involve disruption or damage to the bone structure itself beyond the growth plate.

Understanding this is essential for practitioners because injuries involving the physis can have long-term implications on bone growth and development. Other fracture types, such as comminuted, transverse, and avulsion fractures, involve varying degrees of fragmentation, different bone structures, or specific patterns of bone separation that do not match the criteria for a Type 1 Salter-Harris fracture.