Vaginal delivery-related changes in the pelvic organ position and vaginal cross-sectional area in the general population

Published:December 15, 2017DOI:


      • The rectal position at rest is more caudally located in women with a history of two or more vaginal deliveries than nulliparae.
      • The vaginal cross-sectional area increases in women with a history of two or more deliveries compared with that in nulliparae.
      • At rest, the position of bladder and uterus is not unchanged by vaginal delivery.



      Evaluate the effect of vaginal delivery on pelvic organ positions and vaginal cross-sectional areas.


      MRI of 119 premenopausal women were grouped according to the number of deliveries. The distances from the three 3-reference points (bladder, uterus, and rectum) to two 2-lines (pubococcygeal-line (PCL) and midpubic-line (MPL)), length of H- and M-lines and vaginal cross-sectional area were compared between the groups.


      With increasing parity, distance from the rectum to PCL tended to increase (nullipara vs. bipara; p < 0.01). Vaginal cross-sectional area was larger in bipara and tripara than in nullipara (p < 0.01).


      Rectal position is more caudally located and vaginal cross-sectional area is larger in bipara than in nullipara.


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