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ISRN Obstetrics and Gynecology
Volume 2013 (2013), Article ID 763782, 5 pages
Research Article

Assessment of Bony Pelvis and Vaginally Assisted Deliveries

1Department of Obstetrics and Gynecology, Kuopio University Hospital, P.O. Box 100, 70029 KYS, Finland
2Department of Obstetrics and Gynecology, North-Carelian Central Hospital, Tikkamäentie 16, 80210 Joensuu, Finland
3Department of Obstetrics and Gynecology, Iisalmi Hospital, Riistakatu 21, 74100 Iisalmi, Finland

Received 21 February 2013; Accepted 18 March 2013

Academic Editors: H. Lashen, G. Madsen, and A. Martin-Hidalgo

Copyright © 2013 Ulla Korhonen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. To evaluate whether pelvic measurements have any association with operative vaginal deliveries and the duration of the second stage of the delivery. Study design. A retrospective study of pregnant women at an increased risk of fetal-pelvic disproportion during 2000–2008 in North-Carelian Central Hospital. The mode of the vaginal delivery was chosen to represent the reference standard. The target condition was spontaneous vaginal delivery. Patients were divided into subgroups according to the size of the fetus and also by the parity to evaluate the variability reflecting differences in patient groups. Receiver operating characteristic (ROC) curves were established. Results. A total of 226 participants with fetal cephalic presentation delivered vaginally; of these, 184 women delivered spontaneously, and 42 women required operative vaginal delivery with vacuum extraction. There were no clinically or statistically significant differences between the size of the maternal pelvic outlet and the different modes of delivery types within these subgroups. With respect to the pelvic inlet and outlet, the areas under the curve in ROC were 0.566 with the value of 0.18 and 95% confidence interval (CI) of 0.465–0.667 and 0.573 (95% CI: 0.484–0.622; ). Conclusions. The maternal bony pelvic dimensions exhibited virtually no correlation with the need for operative vaginal deliveries.