• Soo-An Park, Dai-Soon Kwak, Ho-Jung Cho, and Dong-Uk Min.
• Department of Orthopedic Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 271, Cheonbo-Ro, Uijeongbu-si, Gyeonggi-do, 11765, Republic of Korea.
• Arch Orthop Trauma Surg. 2017 Sep 1; 137 (9): 1223-1232.

IntroductionTo observe changes of spinopelvic parameters and the presence of pelvic incidence (PI) variation in different positions, and the accuracy of PI compared with CT scan.Materials And MethodsPatients with standing whole-spine radiograph, CT scan of the pelvic bone, and MRI of the lumbar spine done within a few days were included. The pelvic [pelvic tilt (PT), sacral slope (SS), and PI] and spinal [lumbar lordosis (LL)] parameters were measured by two different observers.ResultsThe PIs from radiograph were significantly greater than those from CT in both observers. By adopting the upper limit of the confidence interval and the agreement of two observers on grouping, patients were categorized into two subgroups (SG1, with less PI change; SG2, with higher PI change). The PT and LL values decreased, whereas SS increased significantly from standing to supine positions in SG1. Significantly decreased PT and PI from standing to supine were observed in SG2. All pelvic parameters and the sagittal vertical axis on radiograph, and the LL amount on MRI were significantly greater in SG2 than in SG1.ConclusionsMajority of patients demonstrated alignment changes of unchanged PI with decreased PT and LL, and increased SS from standing to supine; however, decreased PT and PI and fixed SS and LL were also demonstrated. Patients with higher PI change have high values in three pelvic parameters and sagittal vertical axis, and fixed LL.

15 keywords...

hide…