Abstract: Objective To explore the diagnostic value of postpartum three-dimensional ultrasound of pelvic floor combined with pelvic floor muscle tension assessment technology for stress Urinary incontinence. Methods A total of 72 patients with stress Urinary incontinence admitted to our hospital from January 2019 to January 2023 were selected as the research objects, and they were divided into the observation group. In addition, 72 volunteers who came to our hospital for physical examination at the same time and did not appear stress Urinary incontinence after delivery were selected as the control group. All women were taken three-dimensional ultrasound and pelvic floor muscle tension assessment. The three-dimensional ultrasound parameters of the pelvic floor and pelvic floor muscle tension assessment parameters of the two groups of subjects were compared, and the diagnostic efficacy of three-dimensional ultrasound of the pelvic floor combined with pelvic floor muscle tension assessment technology in postpartum stress Urinary incontinence was analyzed based on the gold standard of clinical diagnosis of stress Urinary incontinence. Results The area of the pelvic hiatus and parameters of the posterior angle of the bladder and urethra in the observation group were significantly higher than those in the control group in the Valsalva state and resting state, while the puborectal thickness and thickness in the Valsalva state and resting state were lower than those in the control group (P<0.05); The parameters of endurance contraction (type II muscle), continuous contraction (type I muscle) and rapid contraction (type I muscle) in the observation group were significantly lower than those in the control group, and the parameters of the anterior Resting potential and the posterior Resting potential were significantly higher than those in the control group (P<0.05); The sensitivity and specificity of three-dimensional pelvic floor ultrasound combined with pelvic floor muscle tension assessment in the diagnosis of stress Urinary incontinence were significantly higher than those of a single diagnosis (P<0.05). For patients with stress Urinary incontinence, the changes of pelvic floor structure and function can be observed by three-dimensional ultrasound of the pelvic floor, and the muscular tension of pelvic floor muscles in different situations can be evaluated by pelvic floor muscle tension assessment technology. The Sensitivity and specificity of the combination of the two for the diagnosis of stress Urinary incontinence is higher than that of a single diagnosis.

Key words: pelvic floor three-dimensional ultrasound, assessment of pelvic floor muscle tension, stress urinary incontinence, diagnostic effectiveness