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Science Forum Index » Anthropology Forum » Human Female Racial Pelvic Differences
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| Author |
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| James Michael Howard |
 Posted: Tue Apr 08, 2008 4:39 pm |
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Obstet Gynecol. 2008 Apr;111(4):914-920.Related Articles, Links
Racial Differences in Pelvic Anatomy by Magnetic Resonance Imaging.
Handa VL, Lockhart ME, Fielding JR, Bradley CS, Brubaker L, Cundiff GW, Ye
W, Richter HE; for the Pelvic Floor Disorders Network.
Department of Gynecology and Obstetrics, Johns Hopkins University,
Baltimore, Maryland; Department of Radiology, University of Alabama at
Birmingham, Birmingham, Alabama; Department of Radiology, University of
North Carolina, Chapel Hill, North Carolina; Department of Obstetrics and
Gynecology, University of Iowa Carver College of Medicine, Iowa City, Iowa;
Department of Obstetrics and Gynecology and Urology, Loyola University
Medical Center, Maywood, Illinois; University of British Columbia,
Vancouver, British Columbia, Canada; Department of Biostatistics,
University of Michigan, Ann Arbor, Michigan; and Department of Obstetrics
and Gynecology, University of Alaama at Birmingham, Birmingham, Alabama.
OBJECTIVES: To use static and dynamic magnetic resonance imaging (MRI) to
compare dimensions of the bony pelvis and soft tissue structures in a
sample of African-American and white women. METHODS: This study used data
from 234 participants in the Childbirth and Pelvic Symptoms Imaging Study,
a cohort study of 104 primiparous women with an obstetric anal sphincter
tear, 94 who delivered vaginally without a recognized anal sphincter tear
and 36 who underwent by cesarean delivery without labor. Race was
self-reported. At 6-12 months postpartum, rapid acquisition T2-weighted
pelvic MRIs were obtained. Bony and soft tissue dimensions were measured
and compared between white and African-American participants using analysis
of variance, while controlling for delivery type and age. RESULTS: The
pelvic inlet was wider among 178 white women than 56 African-American women
(10.7+/-0.7 cm compared with 10.0.+0.7 cm, P<.001). The outlet was also
wider (mean intertuberous diameter 12.3+/-1.0 cm compared with 11.8+/-0.9
cm, P<.001). There were no significant differences between racial groups in
interspinous diameter, angle of the subpubic arch, anteroposterior
conjugate, levator thickness, or levator hiatus. In addition, among women
who delivered vaginally without a sphincter tear, African-American women
had more pelvic floor mobility than white women. This difference was not
observed among women who had sustained an obstetric sphincter tear.
CONCLUSION: White women have a wider pelvic inlet, wider outlet, and
shallower anteroposterior outlet than African-American women. In addition,
after vaginal delivery, white women demonstrate less pelvic floor mobility.
These differences may contribute to observed racial differences in
obstetric outcomes and to the development of pelvic floor disorders. |
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