Pelvic Incidence Can Be Changed not only by Age and Sex, but also by Posture Used during Imaging.
10.14245/kjs.2017.14.3.77
- Author:
Ji Won MOON
1
;
James Ki SHINN
;
Dalsung RYU
;
Se Yang OH
;
Yu Shik SHIM
;
Seung Hwan YOON
Author Information
1. Department of Neurosurgery, Inha University College of Medicine, Incheon, Korea. nsyoon@gmail.com
- Publication Type:Original Article
- Keywords:
Pelvic incidence;
Posture;
Age factors;
Sex factors;
Sagittal imbalance
- MeSH:
Age Factors;
Female;
Humans;
Incidence*;
Male;
Posture*;
Radiography;
Sex Factors
- From:Korean Journal of Spine
2017;14(3):77-83
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: Computed tomography (CT), rather than conventional 2-dimensional radiography, was used to scan and measure pelvic parameters. The results were compared with measurements using X-ray. METHODS: Pelvic parameters were measured using both CT and X-ray in 254 patients who underwent both abdomino-pelvic CT and X-ray at the pelvic site. We assessed the similarity of the pelvic parameters between the 2 exams, as well as the correlations of pelvic parameters with sex and age. RESULTS: The mean values of the subjects’ pelvic parameters measured on X-ray were: sacral slope (SS), 31.6°; pelvic tilt (PT), 18.6°; and pelvic incidence (PI), 50.2°. The mean values measured on CT were: SS, 35.1°; PT, 11.9°; and PI, 47.0°. PT was found to be 4.07° higher on X-ray and 2.98° higher on CT in women, with these differences being statistically significant (p < 0.001, p < 0.001). PI was 4.10° higher on X-ray and 2.78° higher on CT in women, with these differences also being statistically significant (p < 0.001, p=0.009). We also observed a correlation between age and PI. For men, this correlation coefficient was 0.199 measured using X-ray and 0.184 measured using CT. For women, this correlation coefficient was 0.423 measured using X-ray and 0.372 measured using CT. CONCLUSION: When measured using CT compared to X-ray, SS increased by 3.5°, PT decreased by 6.7°, and PI decreased by 3.2°. There were also statistically significant differences in PT and PI between male and female subjects, while PI was found to increase with age.
