Zygomatic arch view. Preoperative zygomatic arch view of a patient (No. 6) with right-sided zygomatic depression. The most anterior point of zygoma-orbit complex is used as standard. Line A denotes the normal position of the zygoma-orbit complex and line B the displaced position of the zygoma-orbit complex. The distance between line A and B was measured before and after surgery to assess height difference. Line C denotes the distance between base line (vertical line drawn from nasal septal bone used as standard) and most lateral point of normal side zygoma, and line D the distance from base line to that of malunioned zygoma. The distance difference between line C and D was measured before and after surgery to assess horizontal width change.