The surgery will be carried out by one of three experienced hysteroscopic surgeons with the use of a 8.5-mm rigid hysteroscope (Olympus) with 0.9% normal saline infusion under 100-120 mmHg pressure. The procedure will be performed under general anesthesia in a day surgery unit. Ultrasonographic guidance will be routinely used. Once the extent and severity of uterine adhesion has been assessed, the adhesions will be divided with the use of bipolar instrument until normal uterine anatomy is achieved.At the conclusion of the surgery, in the immediate balloon group: a Foley-catheter will be immediately inserted into the uterine cavity and the balloon will be distended with 5mls of saline under ultrasound guidance and the balloon will stay in situ for 7 days. In the delayed balloon group,a Foley catheter will be inserted into the uterine cavity 2 weeks after the surgery, the balloon will be inflated with normal saline (from 3-5ml) then deflated, and the procedure repeated three time over 3 minutes or so, then the cavity will be flushed with 10 mls of normal saline solution after via the irrigating channel of the Foley catheter before removal. The whole procedure will be repeated a further 2 weeks later.