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Abstract Objective: To evaluate the effect of different delivery modes on female pelvic floor morphology and function by transperinealfourdimensional ultrasound. Methods: 100 postpartum women were divided into two groups according to their delivery modes, which included vaginal delivery group (54 cases) and cesarean delivery group (46 cases). Another 30 healthy women without pregnancy were selected in control group. All women were evaluated their pelvic floor morphology and function by fourdimensional ultrasound. The index of evaluated the structure of pelvic floor by ultrasound were Dr/Ds, Ar/As, UVJM, levator hiatus length and area, and ARJVD under resting statusand Valsalva movements. The abnormal structure of pelvic floor included cystocele, uterine prolapse, rectocele, puborectalis muscleinjuriesand increased mobility of bladder neckdescent. Results: As for pelvic floor morphology, Dr/Ds, Ar/As, UVJM, levator hiatus length and area and ARJVD of women in vaginal delivery group were significant larger than those of women in cesarean delivery group and in control group (P< 0.05). In Valsalva movements status, the changes of women in cesarean delivery group were significant different when compared to those of women in control group (P< 0.05), while had no significant different in resting status (P> 0.05). As for pelvic floor function, the pelvic floor dysfunction of women in vaginal delivery group was more serious than those of women in cesarean delivery group. Conclusion: Vaginal delivery maybe more influence on pelvic floor structure and function than cesarean section. Transperineal fourdimensional ultrasound can effectively evaluate the morphology and function of the pelvic floor structures, and can provide evidence for early diagnosis.
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