Low incidence of levator avulsion takes place in normal vaginal deliveries. However, forceps delivery is the riskiest type of delivery for pelvic floor pathology and its recovery.

Objective To determine the frequency of avulsion of the levator ani muscle in primiparous women according to delivery mode, using introital four-dimensional ultrasonography. Methods

Ultrasound evaluation of urethral supports does not discriminate between continent and incontinent women. However, the length of the USC at rest was shorter and urethral mobility was higher in incontinent women. Neurourol. Urodynam. 9999:XX-XX, 2016. © 2016 Wiley Periodicals, Inc.

In normal vaginal delivery, neither the area of the urogenital hiatus nor its difference at rest and during contraction, as measured by ultrasound, were modified by performing an episiotomy.