Endometrial pathological changes after Fallopian ring tubal ligation.

Endometrial biopsy was used to study the luteal phase in patients with Fallopian ring (Yoon ring) tubal ligation. Luteal phase insufficiency was found in 9.3% of patients in the study group and in 3.4% of patients in the control group. THe differences are statistically not significant (p = 0.5). The patients with histological evidence of poor luteal phase after tubal ligation presented with oligomenorrhea and dysfunctional uterine bleeding. These results exclude the possibility of some interference with the utero-ovarian circulatory system caused by Fallopian rings.