occipitoposterior
Pronunciation: ok-SIP-ih-toe-pos-TEER-ee-or
Also written as: OP
Fetal position where the back of the baby's head faces the mother's spine during delivery.
Full Definition
Occipitoposterior (OP) position describes fetal presentation where the occiput (back of fetal head) is directed toward the maternal sacrum rather than the symphysis pubis. This 'back-to-back' position occurs in approximately 10-15% of pregnancies and can result in prolonged labour, increased maternal discomfort (particularly back pain), and higher rates of operative delivery. Most OP presentations rotate spontaneously during labour, but persistent OP position may require assisted delivery or caesarean section. The condition is also associated with deflexed fetal head and increased risk of perineal trauma.
Usage
Usage note: Commonly abbreviated as OP in clinical documentation.
In Context
- "The fetal head remained in occipitoposterior position despite active labour." — Labour progress notes
- "Persistent occipitoposterior position indicated need for rotational forceps delivery." — Operative delivery note