The effect of maternal position at birth on perineal trauma: A systematic review

Abstract

Perineal trauma is associated with short- and long-term maternal morbidity. Research has found that maternal position at birth can influence perineal trauma. However, there is a dearth of evidence examining specific maternal positions, including waterbirth, and how these can influence incidence and degree of perineal trauma. Such evidence is important to help reduce trauma rates and improve information for women and midwives. To address this gap in reliable evidence, a systematic review was conducted. Seven studies met the inclusion criteria. Compared to land birth, waterbirth was found to cause an increase in perineal trauma. Kneeling and all-fours positions were most protective of an intact perineum. Allowing for different variables, sitting, squatting and using a birth-stool caused the greatest incidence of trauma. The findings of this review demonstrate that further research is required around perineal guarding in alternative birth positions and how parity affects trauma rates with waterbirth, so that women may be advised appropriately. It also suggests findings that midwives can use when discussing alternative birth positions with women.