Fig. 2.

(A) Preoperative whole spine standing radiographs in case 6 (a true-positive case). Preoperative LL was 7°, SS was 13°, PT was 37°, PI–LL was 43°, SVA was 113 mm, and Cobb angle was 46°. (B) Postoperative whole spine standing radiographs in case 6 (a true-positive case). This case had alarm after rod rotation. Postoperative LL was 52°, SS was 31°, PT was 13°, PI–LL was -8°, SVA was -10 mm, and Cobb angle was 9°. LL, lumbar lordosis; SS, sacral slope; PT, pelvic tilt; PI, pelvic incidence; SVA, sagittal vertical axis.