Fig. 4.

Radiographic measurements on immediate postoperative anteroposterior radiograph after angulated Salter osteotomy. Distance d (mm) represents the lateral displacement of distal fragment. Lateral rotation angle (°) is the open-wedge angle between the proximal and distal bone fragments. The ratio of the obturator height (%) is the maximum height of the obturator foramen on the operative side (a) relative to that on the contralateral side (b), calculated as a/b × 100. Parallel lines are drawn to the tear drop line at the superior margin of the iliac crest and the acetabular roof. The pelvic height increase percentage (%) is the pelvic height on the operative side (a) relative to that on the contralateral side (b), calculated as (A–B)/B × 100. LRA, lateral rotation angle; TDL, tear drop line.