Fig. 2

a A 8–9 year-old boy visited the clinic at 32 days post trauma with type III tibial eminence fracture. b, c Radiographs taken at postoperative 2.5 months. Incomplete distal femoral metaphyseal fracture (arrow) occurred during vigorous physical therapy. d While removing screws, it was found that the head of 5.0 mm screw impinged against the lateral portion of the medial femoral condyle and caused extension deficit of the knee. e Radiolucent gap between avulsed fragment and host bone was found on the day of screw removal. f A radiograph taken at postoperative 18 months. He was lost to follow-up for 1 year. He returned to the clinic with flexion contracture of 25° and re-displaced avulsed fragment. g, h He underwent open reduction and internal fixation with two 5.0 mm screws in conjunction with two washers for re-displaced fragments