Comparison of pelvic incidence measurement using lateral x-ray, standard ct versus ct with 3d reconstruction

摘要

Abstract Purpose Pelvic incidence (PI) is a position independent parameter used to quantify spinopelvic sagittal balance. PI is generally measured on lateral radiographs, but more recent studies have suggested better accuracy with standard CT scans versus three-dimensional (3D) CT scans. This study compares PI obtained from lateral XR, standard CT scan and CT scan with 3D reconstruction. Methods A total of 77 subjects with lateral XRs of the pelvis or lumbosacral spine and CT scans of the pelvis were randomly selected. Pelvic incidence on lateral XRs, standard CT scans and CT scans utilizing multiplanar reconstruction were measured and compared using intraclass correlation coefficients (ICC). PI was also measured on serial images in 28 individuals using the same imaging modality within 3?years and evaluated using ICC.Results Mean?±?SD of PI measurements on XR, standard CT and CT with 3D reconstruction were 56°?±?13°, 53°?±?12° and 53°?±?12°, respectively, demonstrating a small but significant elevation of PI measurement on XR (P?