Abstract Objective: To explore the effect of of three-dimensional ultrasound for evaluating pelvic floor muscle function of women after vaginal delivery. Methods: 200 women after delivery were included and were divided into group A (130 women with vaginal delivery) and group B (70 women with caesarean section) from January 2017 to January 2018. And the pelvic floor muscle function of women in both groups were evaluated by three-dimensional ultrasound. Results: The resting state of posterior vesicourethral angle, the Valsalva state of posterior vesicourethral angle, the angle of the bladder neck, the mobility of the bladder neck, resting state of levator anal fissure area, hiatus area of levator anal muscle in anus constriction, the area of the hiatus in the Valsalva state, the incidence of stress urinary incontinence, the type I myofibrillar potentials, and type II myofibrillar potentials of women in group A were 126.0±8.5°,161.2±6.7°, 36.13±4.90°, 34.5±3.5mm, 13.2±2.1cm2, 11.5 + 2.0cm2, 20.4±3.3cm2, 26.15%, 8.0±1.1 V, and 8.1±1.12V, respectively, which were significant higher than those of women in group B (P<0.05). The maximum contractile force and continuous contractile force of pelvic floor muscle strength of women in group A were 36.4±8.6V and 20.1± 6.3V, which were significantly lower than those of women in group B (P<0.05). Conclusion: Three-dimensional ultrasound used to evaluate the pelvic floor function of women after vaginal delivery has good value. Vaginal delivery maybe has significant influence on the pelvic floor structure and muscle strength of women when compare to that of caesarean section.
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