Disruption of the endometrial-myometrial border during pregnancy as a risk factor for adenomyosis.

We assessed surgical disruption of the endometrial-myometrial border during pregnancy as a risk factor for adenomyosis in a cohort of 1850 women undergoing hysterectomy during 1978 to 1981. Women who had 3 or more abortions when sharp curettage was common were at increased risk for adenomyosis; women who had curettage procedures or cesarean deliveries were not.