The effects of parturition on female pelvic floor anatomy and function.

Our knowledge of the immediate effects of parturition on pelvic floor anatomy and physiology has been sparse. However, with the introduction of computed tomography, ultrasonography, and magnetic resonance imaging, new tools have become available for visualizing dynamic antenatal and postpartum changes in the pelvic musculature. Although few studies have been performed, there is evidence of a pregnancy-related increase in the frequency of urinary stress incontinence, and of an increased frequency of persistent anal incontinence in cases of sphincter tears.