Abstract: The cesarean scar defects（CSD） is the hypoechoic area of the lower segment of the uterus under ultrasound. It is the absence or rupture of the myometrium at the incision of the previous cesarean section, which affects about 30% of women. At present, the cause of CSD is not clear, but studies have found that low incision position, single suture, using chrome gut, psychological pressure, posterior position of uterus, multiple cesarean section are risk factors of CSD. Double layer suture, peritonealsuture and absorbable suture are good for incision healing. In addition, the formation of CSD is related to the long-term use of corticosteroids, history of adenomyosis, history of vaginal delivery, history of pre-eclampsia.

Key words: Cesarean section；, Cicatrix；, Risk factors；, Suture techniques