Study of anthropometric measurements to predict contracted pelvis

Abstract

Background: To study the efficacy of using maternal height, foot length, external pelvic measurements, sacral rhomboid dimensions as predictors of contracted pelvis (CP) in a cohort of our population and proposed to include estimated fetal weight as an additional parameter as a predictor of cephalopelvic disproportion. Methods: In 1000 uncomplicated primigravida after 37 weeks gestation, transverse and vertical diagonal (TD and VD) of the sacral rhomboid, intertrochanteric diameter, biacromial diameter, foot length in centimeters, height in centimeters and weight in kilograms and birth weight of the baby in kilograms were recorded. Postdelivery, patients fell into two groups: Group-1: control (no CP) - women having uncomplicated vertex vaginal delivery, Group-2: cases (CP) - this group will include women with pelvic disproportion having: Caesarean section for disproportion detected on pelvic assessment or for non-descent/non rotation of the fetal head, Vacuum or forceps delivery for prolonged second stage, Vaginal delivery complicated by obstruction, birth trauma or unexplained intrapartum asphyxia. These two groups will be compared for their outcome. Data was analyzed using t-test, Pearson's-Chi square, Fishers exact test and multivariant logistic regression. Results: Cephalopelvic disproportion was present in 123 women. In univariate analysis, maternal height, foot length, intertrochanteric diameter and biacromial diameter were found to be associated with cephalopelvic disproportion, Rhomboid dimensions were smaller in CP group (TD of rhomboid P value < 0.001, VD of rhomboid P value 0.001). For transverse diagonal, when the 10th percentile (