Are Pelvic Floor Muscle Thickness and Size of Levator Hiatus Associated With Pelvic Floor Muscle Strength, Endurance and Vaginal Resting Pressure in Women With Pelvic Organ Prolapse Stages I-III? A Cross Sectional 3D Ultrasound Study

Aims To investigate if pelvic floor muscle (PFM) thickness and area of levator hiatus (LH) are associated with manometry measured PFM function in 109 women with pelvic organ prolapse (POP) stages I–III. Methods In this cross‐sectional study pubovisceral muscle thickness and LH area were assessed with three‐dimensional transperineal ultrasound at rest and analyzed in the axial plane. PFM function was assessed with manometry and included strength, endurance, and vaginal resting pressure. Relationships were investigated using univariate linear logistic regressions models, Pearson product‐moment correlation coefficient and hierarchical multiple regression. Results The mean age was 49 (SD 12). There was a significant positive moderate association between muscle thickness and PFM strength (r = 0.49, P