It is recommended to use the vaginal approach with cardiotocographic monitoring.

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Selecting an IUD that fits the uterine dimensions is believed to be a keystone in improving IUD performance. This study included 15 women admitted for hysterectomy with no gross pelvic pathology distorting the uterine cavity and no contraindication to hysterography. Before hysterectomy the uterine cavity dimensions were measured using the Wing Sound II device and hysterography. After hysterectomy, direct measurements of the same dimensions were performed. The correlation between the Wing Sound II device measurements and those obtained by the direct method was highly significant except for the fundal transverse dimension where the correlation was moderately significant. On the other hand, hysterography measurements had a moderately significant correlation with those obtained by the direct method, except for the fundal transverse dimensions and the total uterine length where the correlation was insignificant. The Wing Sound II device is a simple, safe and accurate tool for studying uterine geometry on an outpatient basis.