pelvic floor muscles play an important role in supporting the pelvic organs. Vaginal birth leads to defects in pelvic muscles and hence subsequent pelvic organ prolapse and urinary and fecal incontinence can occur . Transperineal ultrasonography study pelvic floor pathology with minimal discomfort to the patient and lower cost than magnetic resonance imaging.

355 eligible Egyptian women had been enrolled Maternal Medical, surgical and obstetrical history was obtained. Demographic data (maternal age, maternal body mass index, duration of second stage labor, episiotomy, maternal injuries, neonatal birth weight, and neonatal head circumference were obtained. A modified questionnaire on symptoms of pelvic floor dysfunction was filled by the patients in both visits. vaginal examination with the women to detect any pelvic organ prolapse (quantified according to POP-Q classification system.

All ultrasound volumes were acquired 7days after delivery and another examination 6weeks post-delivery by one experienced sonographers using a GE Voluson p8 (GE Healthcare) equipped with a 4-8-MHz curved array 3D/4D ultrasound transducer. After emptying the bladder, ultrasound was done while the patient in the supine position. The probe was covered with clean glove adjusted and wrapped with an adhesive tape to make it firmly contacted to the probe and then placed on the perineum in the sagittal plane. The field of view angle was set to a maximum of 70° in the sagittal plane and the volume acquisition angle to 85° in the axial plane. Two 3D volumes (one with the patient at rest and one during Valsalva maneuver) were recorded.

Inclusion Criteria:

• Primipara who had singleton fetus with cephalic presentation were recruited during their first post-partum visit ,1week post-delivery.

Exclusion Criteria:

Multi para, Multifetal pregnancy, congenital anomalies of the genital tract past history of pelvic floor surgery or trauma or inability to come for follow up after 6weeks

This study was performed at Shatby maternity university hospital in Alexandria where 12000 deliveries per year are achieved . Over a 4-months period (February-June 2021.

355 eligible Egyptian women

all individual participant data that underlie result

starting 6 months after publication).

all individuals in the same institution