Levator ani muscle avulsion during childbirth: a risk prediction model

To establish the incidence of levator ani muscle (LAM) avulsion in primiparous women and to develop a clinically applicable risk prediction model.Observational longitudinal cohort study.District General University Hospital, United Kingdom.Nulliparous women at 36 weeks of gestation and 3 months postpartum.Four-dimensional transperineal ultrasound was performed during both visits. Tomographic ultrasound imaging at maximum contraction was used to...