Fig. 1

An 9-month-old boy with TFDH secondary to falling down from a bed. The typical medial displacement of the proximal forearm related to the distal humerus on the anteroposterior radiography (1A). The ultrasonic transducer was placed to the radial side of the elbow to assess the lateral displacement of the fracture (1B). The medial displacement of the humeral capitellum (*) and the radial head (R) compared with the humerus (H) (1C). After the closed reduction, the relationship between humeral capitellum (*) and humerus (H) has been corrected (1D). The anteroposterior radiography after treatment (1E). The typical posterior displacement of the proximal forearm related to the distal humerus on the lateral radiography (2A). The transducer was placed to the posterior side of the distal humerus to assess the posterior displacement of the distal humerus (2B). The posterior displacement of the humeral capitellum (*) compared with humerus (H) (2C). After the closed reduction, the posterior displacement of the humeral capitellum (*) has been corrected (2D). The lateral radiography after treatment (2E)