Association between levator ani muscle avulsions and technique of vacuum extraction – a prospective exploratory study

We found no fetal, maternal or obstetrical characteristics or parameters of vacuum technique that were associated with the occurrence of levator ani muscle trauma after vacuum extraction, except for insufficient uterine contractions. Nevertheless, there might be influencing factors that have not yet been evaluated, or are not easily accessible for evaluation, like the adaptations of the fetus inside the birth canal and within the hiatus of the levator ani muscle, and the adaptations of the birth canal to the fetus passing through. This should be the subject of further research with a sample size adequately powered to answer this question properly. (Trial registration number: BASEC-Nr.2016-00908.)  .