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(a) Anteroposterior pelvic radiograph shows slipped upper femoral epiphysis on the right. (b) Frog-leg lateral radiograph confirms slipped upper femoral epiphysis with widening of the physis (black arrow), with the direction of the slippage shown (white arrows). (c) Radiograph shows that the line of Klein (white line) running along the lateral margin of the femoral neck does not cross the femoral head epiphysis.
