Appearance of the levator ani muscle in pregnancy as assessed by 3-D MRI

Muriel K. Boreham, Michael V. Zaretsky, Marlene M. Corton, James M. Alexander, Donald D. McIntire, Diane M. Twickler

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Objective: The purpose of this study was to describe levator ani (LA) anatomy in postterm nulliparas using 3-dimensional (3-D) magnetic resonance (MR). Study design: Nulliparas (n = 84) with uncomplicated, postterm pregnancies underwent an MR (4 mm slices, 0 gap) of the uterus and pelvis. LA volume and morphometry were assessed using 3-D post-processing software. Results: LA insertion into the symphysis was visible in 93%, and the iliococcygeus muscle assumed a convex shape (arch) in the 92% of the 84 women. The LA shape was characterized as "U" in 53% and "V" in 47%. Mean LA volume was 13.5 (3.7) cm3. There was a positive association between LA volume and higher fetal station (P = .02) and increasing BMI (P < .001). However, no relationship between LA volume and station was found after adjusting for BMI. Conclusion: BMI was correlated with LA volume in postterm nulliparas. LA insertion into the symphysis and the iliococcygeus arch were well-preserved overall and morphometry was variable.

Original languageEnglish (US)
Pages (from-to)2159-2164
Number of pages6
JournalAmerican Journal of Obstetrics and Gynecology
Volume193
Issue number6
DOIs
StatePublished - Dec 2005

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Anal Canal
Pregnancy
Muscles
Magnetic Resonance Spectroscopy
Pelvis
Uterus
Anatomy
Software

Keywords

  • Levator ani
  • Levator hiatus
  • Magnetic resonance imaging
  • Nulliparous

ASJC Scopus subject areas

  • Medicine(all)
  • Obstetrics and Gynecology

Cite this

Appearance of the levator ani muscle in pregnancy as assessed by 3-D MRI. / Boreham, Muriel K.; Zaretsky, Michael V.; Corton, Marlene M.; Alexander, James M.; McIntire, Donald D.; Twickler, Diane M.

In: American Journal of Obstetrics and Gynecology, Vol. 193, No. 6, 12.2005, p. 2159-2164.

Research output: Contribution to journalArticle

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AU - Zaretsky, Michael V.

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AU - Alexander, James M.

AU - McIntire, Donald D.

AU - Twickler, Diane M.

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