Ultrasound location of intrauterine devices placed at cesarean section over the first year postpartum.

Objectives: The primary objective was to measure IUD-fundus and IUD-myometrium distances by ultrasound of IUDs placed during cesarean section over the first year of use. The secondary objective was to determine if these distances are associated with risk of expulsion or removal for side effects.

Study Design: In this prospective observational study, we performed ultrasounds at six - ten weeks, three months and one year postpartum to measure the distance from the top of the device to the fundal serosa (IUD-fundus) and upper margin of the endometrial cavity (IUD-myometrium).