(A) Positive and negative directions for pelvic obliquity, in reference to the left hip, are shown. For the right hip, positive and negative directions would be reversed. (B) Positive and negative directions for pelvic rotation, in reference to the left hip, are shown. For the right hip, positive and negative would be reversed. (C) Positive and negative directions for pelvic tilt, in reference to the left hip, are shown.