Abstract: This study investigated the value of three-dimensional ultrasonography in the diagnosis of female pelvic floor dysfunction (PFD) during pregnancy and postpartum and the changes in pelvic floor structure. 134 pregnant women who underwent the whole process of prenatal examination were selected as the research objects, and all underwent three-dimensional pelvic floor ultrasound examination. The parameters differences of three-dimensional pelvic floor ultrasound in different pregnancy periods were analyzed, and at the same time the differences of three-dimensional pelvic floor ultrasound parameters between pregnant women with and without pelvic floor dysfunction diseases were compared. Under rest, contraction and Valsalva maneuver after 42 days postpartum, the anterior and posterior diameter, left and right diameter, area, posterior bladder angle, urethral rotation angle and bladder neck movement were significantly higher than those in the early and late pregnancy (P<0.05). There were significant differences in maternal age, history of constipation, prenatal urinary incontinence and family history of pelvic floor dysfunction between women with and without pelvic floor dysfunction (P<0.05). With the advancement of pregnancy, the parameters such as the diameter of maternal anal lift muscle and other crack are constantly increasing, especially the occurrence of pelvic floor dysfunction diseases, and the value of three-dimensional ultrasound diagnosis of PFD is high.

Key words: pelvic floor structure, three dimensional ultrasonography, pelvic floor dysfunction