Document Detail

Analysis of McRoberts' maneuver by x-ray pelvimetry.
MedLine Citation:
PMID:  10636500     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To document radiographically the changes in pelvic dimensions created by McRoberts' maneuver. METHODS: Women at least 37 weeks' pregnant who presented to labor and delivery were eligible for study entry. Anterior-posterior and lateral x-rays were taken with women in the dorsal lithotomy position and after application of McRoberts' maneuver, in which the maternal legs were hyperflexed 45 degrees onto the maternal abdomen. A two-tailed paired t test was used to assess the changes in the pelvic diameters, with P < .05 considered statistically significant. RESULTS: Thirty-six subjects were enrolled in the study and 34 x-rays were suitable for analysis. McRoberts' maneuver was associated with an increase in the mean angle of inclination between the symphysis pubis and the sacral promontory (51.53 +/- 2.03 versus 38.07 +/- 1.96 degrees, P < .001). There was a 24% decrease in the angle created by drawing a line bisecting the symphysis pubis relative to the horizontal (P < .001). With McRoberts' maneuver the angle created by a line bisecting the longitudinal axis of the fifth lumbar vertebra and the longitudinal axis of the upper sacrum also increased (133.75 +/- 2.25 to 140.14 +/- 2.12 degrees, P = .04). CONCLUSION: Ours are the first systematic observations of pelvic changes associated with McRoberts' maneuver, confirming the traditional thinking that the maneuver causes a significant cephalad rotation of the symphysis pubis and subsequent flattening of the sacrum.
R B Gherman; J Tramont; P Muffley; T M Goodwin
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  95     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-02-07     Completed Date:  2000-02-07     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  43-7     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynecology, Naval Medical Center Portsmouth, Virginia, USA.
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MeSH Terms
Delivery, Obstetric*
Dystocia / prevention & control*
Pubic Symphysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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