Transperineal sonographic assessment of the angle of progression before the onset of labour: how well does it predict the mode of delivery in late-term pregnancy

Predicting the success of vaginal delivery is an important issue in preventing adverse maternal and neonatal outcomes. This study sought to examine whether measurement of the angle of progression (AoP) can predict a successful vaginal delivery following induction of labour (IoL) among late term nulliparous women with a low (4>) Bishop score.