Fig. 1

Patient case 24. a The anteroposterior radiographs showed a displacement of 2.5 mm. b The internal oblique radiographs showed a displacement of 5 mm. c The transverse ultrasound image showed the disrupted cartilage hinge on lays when the center of the ossification region in the capitellum epiphysis was found. d The transverse ultrasound image showed the intact cartilage hinge before reaching the articular surface and the disrupted cartilage hinge (arrow). e Radiographs in the anteroposterior views of an arthrogram. The dye was tracked along the fracture line and stopped before reaching the articular surface (arrow), thus indicating an intact cartilaginous hinge. Arrowhead, cartilage hinge; asterisk, epiphyseal core of ossification of the capitellum; double asterisks, hemorrhage; M, medial; L, lateral; C, cartilage of the epiphysis