[Control of IUD-position (author's transl)].

The correct position of an IUD in the uterine cavity is essential for the effectiveness of the method. Ultrasound examination of the thickness of the anterior and posterior wall of the uterus were carried out and their relation to a correct position of the IUD calculated. It was found that the position of the IUD is correct, if the distance between fundus and the cranial end of the IUD does not exceed the thickness of the uterine wall by more than one-third; i. e. in all 4/3 of the thickness. The correlation between the ultrasound results of length, version and flexion of the uterus and complaints and side-effects like bleeding and pain are discussed, especially if the IUD is not in correct position.