Patient Factors Associated with Presacral Space Depth: A Pelvic MRI Study

Area of Science:

• Urogynecology
• Pelvic Reconstructive Surgery
• Anatomical Studies

Background:

• Sacrocolpopexy is a durable repair for advanced pelvic organ prolapse.
• Dissection of the presacral space is a critical yet challenging step.
• Patient-specific factors influencing presacral anatomy require further investigation.

Purpose of the Study:

• To investigate patient-specific factors, particularly body mass index (BMI), associated with variations in presacral space depth.
• To identify anatomical variations relevant to sacrocolpopexy surgical planning.

Main Methods:

• Retrospective cohort study analyzing pelvic MRI scans (n=167) in women.
• Standardized midsagittal MRI technique to measure presacral depth, ligament thickness, and sacral dimensions (L5-S3).
• Correlation analyses between anatomical measurements and patient demographics/clinical characteristics.

Main Results:

• BMI showed weak correlation with presacral space depth.
• History of hysterectomy was linked to a 24% increase in presacral depth at S1 (p=0.01).
• Postmenopausal status and estrogen use correlated with increased L5-S1 disc space height.

Conclusions:

• Presacral space depth is not significantly influenced by BMI.
• Prior hysterectomy is a key factor associated with altered presacral anatomy.
• These findings are relevant for optimizing surgical planning in sacrocolpopexy.