Document Detail

Obstetric MR pelvimetry: reference values and evaluation of inter- and intraobserver error and intraindividual variability.
MedLine Citation:
PMID:  12601187     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To establish obstetric magnetic resonance (MR) pelvimetric reference values in a large study population and stratify them according to delivery modality and to determine the intra- and interobserver error and intraindividual variability of MR pelvimetric assessment in volunteers. MATERIALS AND METHODS: MR pelvimetric data were retrospectively reviewed in 781 women (mean age, 28.9 years +/- 5.2 [SD]) clinically referred, and the data were correlated to obstetric history to derive normative values. Five observers assessed results of multiple MR pelvimetric examinations in 10 female volunteers (mean age, 34.7 years +/- 6.0; eight nullipara, two primipara) to provide data for measurement error analysis. RESULTS: All values were higher in the spontaneous vaginal delivery subgroup (n = 100) and lower in the cesarean section or vacuum extraction subgroup (n = 130; intersubgroup difference, P <.001, Mann-Whitney U test). Pelvimetric parameters in the group undergoing spontaneous vaginal delivery were as follows: obstetric conjugate, 121.7 mm +/- 8.6; interspinous distance, 112.3 mm +/- 7.9; intertuberous distance, 120.6 mm +/- 11.3; transverse diameter, 129.5 mm +/- 8.7; and sagittal outlet, 115.8 mm +/- 9.9. In the volunteer study, intraobserver, interobserver, and intraindividual reliabilities were high for the obstetric conjugate (0.94-0.96), interspinous distance (0.92-0.95), and transverse diameter (0.95-0.98) but low for intertuberous distance (0.64-0.87) and sagittal outlet (0.66-0.85). CONCLUSION: Pelvimetric dimensions are smaller in women undergoing cesarean section or vacuum extraction than they are in those delivering vaginally. The pelvimetric parameters associated with the largest measurement errors are intertuberous distance and sagittal outlet.
Thomas M Keller; Annett Rake; Sven C A Michel; Burkhardt Seifert; Gul Efe; Karl Treiber; Renate Huch; Borut Marincek; Rahel A Kubik-Huch
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2003-02-11
Journal Detail:
Title:  Radiology     Volume:  227     ISSN:  0033-8419     ISO Abbreviation:  Radiology     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-01     Completed Date:  2003-06-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0401260     Medline TA:  Radiology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  37-43     Citation Subset:  AIM; IM    
Institute of Diagnostic Radiology, University Hospital, Zurich, Switzerland.
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MeSH Terms
Magnetic Resonance Imaging*
Observer Variation
Pelvimetry / methods*,  statistics & numerical data*
Reference Values
Retrospective Studies

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