Anatomical study of the relation between the symphysis and ischial spines by CT scan: improving the interpretation of intrapartum translabial ultrasound (original) (raw)

Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology, 2015

Abstract

The aim of this study was to analyze the anatomical relation between the symphysis and the ischial spines to obtain reliable landmarks for the assessment by Intrapartum Translabial Uultrasound (ITU) of fetal head descent. All Computed Tomography (CT) scans performed for breech presentations and for twin deliveries from 2006 to 2014 in a tertiary university hospital were collected for measurement and analysis by two operators. The Symphysis-left Ischial spine Angle (SIA) and the Symphysis-left Ischial spine Distance (SID) were measured on 3D reconstructions from a CT volume dataset. We calculated intra- and interobserver agreement for SIA and SID with 95% prediction intervals, created Bland-Altman plots created with 95% limits of agreement, and estimated the Intraclass Correlation Coefficient (ICC). A sagittal plane projection from the SIA allowed calculating a sagittal angle, corresponding to the Angle of Progression (AoP) for ITU. SIA and SID were obtained from CT images from 458 w...

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