FIG 2. Measurement of the collapsed vertebral body and reference line. Height of a collapsed vertebral body was measured at the anterior border (A), center (C), and posterior border (P). The height of the posterior border (NP) of an adjacent normal vertebral body was measured for reference. The wedge angle () in this case is 28 degrees before vertebroplasty (A) and 11 degrees after vertebroplasty (B).