Comparison of Bony Pelvic Dimensions and Demographic Risk Factors in Individuals With and Without Pelvic Organ Prolapse [ID: 1377653

Abstract

INTRODUCTION: Previous studies have noted a correlation between bony pelvic measurements and the diagnosis of prolapse via musculofascial insertion points on magnetic resonance imaging. We investigated the importance of bony measurements of the lumbar spine and pelvis as risk factors in the development of prolapse via routine computed tomography (CT) imaging. METHODS: We sampled 171 UBMD obstetrics and gynecology clinic patients who were at least 40 years of age and had an abdominal/pelvic CT scan. Demographic and medical history was reviewed and collected. Participants were then divided into those with and without prolapse. CT images were uploaded to 3D Slicer 5.10. Each study was analyzed by a trained annotator blinded to prolapse status. The area of the anterior pelvis, interspinous diameter, pelvic outlet, ischial spine to pubic symphysis, sacrococcygeal junction to ischial spine, and lumbar and sacrococcygeal curvature were annotated. Demographic characteristics and measured annotations were compared using χ2 test. RESULTS: Women with prolapse were more likely to be older (P<.05) and of lower weight (mean 71.6 kg, P<.05) than controls. Patients with prolapse had a significantly larger area of their anterior pelvis (P<.05) and a significantly longer interspinous diameter (P<.05). Distance from ischial spine to pubic symphysis was significantly longer (P<.05), and pelvic outlet in women with prolapse was significantly longer than in controls (P<.05). CONCLUSION: In addition to known risk factors, bony measurements of the pelvis are significantly different in those with and without pelvic organ prolapse, which may be observed on routine CT imaging.