Fujita N, et al. - Via first study to examine risk factors for postoperative total lung volume reduction on retrospectively reviewed 111 consecutive in adolescent idiopathic scoliosis (AIS) patients aged between 10 and 20 years of age, the researchers intended to identify factors associated with decreased lung volume (LV) after posterior spinal fusion with instrumentation (PSF). Age at surgery, sex, height, body weight, Risser stage, Lenke classification, radiographic parameters, pulmonary function tests, and LV were assessed. A longer fusion area is associated with postoperative LV reduction was suggested. For preserving LV, avoidance of a longer fusion area of ≥ 11 would be preferable.