In radial head subluxations (RHS), which is one of the most common elbow injuries in children, the annular ligament slips into the radiohumeral articular space. History taking and physical examination are often not sufficient to differentiate RHS from elbow fractures. However, MSK ultrasound provides the possibility to detect an elevated posterior fat pad (PFP) or lipohemarthrosis of the PFP, findings that are highly sensitive for fracture at the elbow. It is not clear though whether the same findings are also present in children with RHS.