Effect of Hysteroscopic Metroplasty on Reproductive Outcome in Patients with RIF

If the uterine cavity is normal during intraoperative hysteroscopy, the operation will be finished and embryo transfer will be scheduled in 1 month after the operation; if the uterine cavity is narrowed or the uterine wall is coalesced, hysteroscopic metroplasty and IUD placement will be performed, and a second hysteroscopy with IUD retrieval will be performed after 2-month postoperative estrogen-progesterone treatment, then embryo transfer will be scheduled after 1-month estrogen-progesterone treatment.