Changes of spinopelvic parameters in different positions

Introduction To 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 methods Patients with standing whole-spine radiograph, CT scan of the pelvic bone, and MRI of the lumbar s...

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Bibliographic Details
Published in:Archives of orthopaedic and trauma surgery 2017-09, Vol.137 (9), p.1223-1232
Main Authors: Park, Soo-An, Kwak, Dai-Soon, Cho, Ho-Jung, Min, Dong-Uk
Format: Article
Language:English
Subjects:
Humans
Lordosis - diagnostic imaging
Lumbar Vertebrae - diagnostic imaging
Medical imaging
Medicine
Medicine & Public Health
Orthopaedic Surgery
Orthopedics
Pelvis - diagnostic imaging
Posture - physiology
Radiography
Sacrum - diagnostic imaging
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Summary:Introduction To 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 methods Patients 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. Results The 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. Conclusions Majority 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.
ISSN:0936-8051
1434-3916
DOI:10.1007/s00402-017-2757-0