Fig. (2) Case 1 (A) Pelvic tilt on the sagittal plane was quantified using the aspect ratio of the obturator foramen (H/W) on anteroposterior pelvic radiograph. (B) The pelvis on the standing position. H/W increased from 1.2 to 2.2, suggesting a posterior pelvic tilt of 43 degrees. (C) Severe thoracolumbar kyphosis (dotted line) is present due to multiple compression fractures. H: height the obturator foramen. W: width of the obturator foramen.