Position and integrity of the uterine scar is determined by cervical dilation at the time of Caesarean section.

Pre-labour and early labour Caesarean birth is associated with an increased prevalence of a scar in the uterine cavity as well as a scar niche. Caesarean birth in late labour resulted in positioning of the uterine scar in the endocervical canal and fewer scar niches. Positioning and integrity of the uterine scar after pre-labour and early labour Caesarean birth explains the predisposition to abnormal placental invasion in subsequent pregnancy. This article is protected by copyright. All rights reserved.