What type of fracture involves a corner sign with a triangular fragment at the metaphyseal base?

The presence of a corner sign with a triangular fragment at the metaphyseal base is indicative of a Type 2 fracture, also known as a Salter-Harris Type 2 fracture. This type of fracture occurs in the growth plate, where it extends through the metaphysis and separates a triangular fragment of bone.

The corner sign is an important radiological feature typically associated with pediatric fractures and is critical in identifying cases of non-accidental trauma. In this scenario, the fracture does not extend completely through the growth plate into the epiphysis, which distinguishes Type 2 from the other types.

Understanding the classification of these fractures is vital as it helps predict healing patterns and potential impact on growth, making it essential for diagnosis and treatment.