Trauma

Periosteal Interposition within a Salter Harris Type 2 Fracture.
Top images: Arrow points to Salter II fracture of the posterior distal tibial metaphysis. Middle images and bottom left image: Arrows point to a dark curvilinear structure displaced into the widened anterolateral distal tibial growth plate. Bottom right image: Arrow shows adjacent anterior tib-fib ligament look intact.
Periosteal Interposition