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Abstract
Objective:to assess the strength of the association between transvaginal ultrasonographic measurement of the lower uterine segment in women with prior one CS undergoing a trial of vaginal birth and uterine scar defect at delivery and to ascertain the best cut-off value for predicting uterine rupture . Results: Uterine dehiscence was found in 3 cases (5%).There were no cases ofuterine rupture. The thicknessof lower uterine segment among the gravidas with dehiscence was significantly less than those without dehiscence. The cut-off value for the thickness of lower uterine segment was 3.0 mm as calculated by the receiver operating characteristic curve .The sensitivity was 89.5% , specificity 75.6% , positive predictive value 63% ,negative predictive value 90.3%.