Intrapartum risk factors for levator trauma

To determine intrapartum risk factors associated with levator trauma as identified by ultrasound imaging.A prospective observational study.Antenatal clinic of a tertiary hospital between May 2005 and February 2008.Nulliparous women (n=488) in their first ongoing pregnancy.An interview and four-dimensional translabial ultrasound was carried out between 36 and 38 weeks and again 3-4 months after delivery. Obstetric data were collected from the...