Figure 1. Measurement of the extent of epiphyseal displacement on the lateral
radiograph. The degree of slip is reflected by the angle between the
perpendicular of a line drawn along the long axis of the femoral neck and a
line produced from the anterior to the posterior border of the epiphysis
Figure 2. Anteroposterior radiograph showing mild slip of the right hip fixed with a
single percutaneous screw, and prophylactic fixation of the left hip
Figure 3. Minor slip. A line drawn along the upper femoral neck in an
antero-posterior radiograph does not cut off a segment of epiphysis on the
left side