Female pelvis types and age differences in their distribution

Abstract

The aim of this study was a statistics-based exploration of a typology of the female pelvis. The research sample included 172 females aged from 18 to 69. For measurements, the three dimensional CT images of pelvis were used. A cluster analysis was performed on anteroposterion and transverse diameters of the pelvic inlet and the midplane. The results revealed three clusters representing gynecoid, "narrow", and intermediate types of female pelvis. The distribution of pelvic types in age groups indicates a tendency for the "narrow" pelvis to be presented more frequently in the group of younger females.Variability and typology of the female pelvis is a traditional topic in anthropological studies [3,4,13,17]. The best known classification of the female pelvis was suggested by Caldwell and Moloy in 1933 [3] and it was based on the pelvic inlet shape. In the frame of this classification, four main pelvic types were suggested: gynecoid, android, anthropoid, and platypelloid. The development of this classification resulted in the identification of the mixed types and subtypes based on the width of the pelvic outlet [3]. As a result, more than twenty subtypes were suggested that complicated their analytical implication. In addition, the critics of this classification addressed the subjective impression in the judgments of pelvic shapes without a well established statistical base [19].A tendency of increase in cesarean section is observed in the last decades [2,5,9,15]. In Latvia, the number of cesarean section delivery is growing from 3. 9% in 1980 to 23.7% in 2010 [18]. A narrow pelvis is one of the factors increasing the risk for cesarean section [12]. On the one hand, there is a solution for the narrow pelvis problem from the obstetric perspective. On the other hand, a more detailed analysis is needed from the anthropological perspective because of possible evolutionary trends in the human body in general OKSANA KOLESOVA, JĀNIS VĒTRA

Gynaecoid Pelvis among Female Patients Attending Department of Radiology of a Tertiary Care Centre: A Descriptive Cross-sectional Study

“…Our study had a slightly lower mean value for both the anteroposterior (12.85±1.0 cm) and transverse dimensions (13.66±1.07 cm). 9 Our Free Full Text are Available at www.jnma.com.np study showed a slightly lower percentage of gynaecoid pelvis than the study conducted in the Department of Radiology, Cumhuriyet University, on multiparous women which resulted in 47.8% of the gynaecoid pelvis. Anteroposterior and transverse diameters were 11.64±8.0 cm and 14.04±5.7 cm respectively.…”

Correlation between internal and external bony pelvis dimensions in nulliparous women

“…The pelvic type is de ned by APD (anterior-posterior diameter) and TD (transverse diameter) [8] [17], therefore our hypothesis aims to nd a correlation between APD and a chosen external dimension in the sagittal plane, and between TD and a chosen external dimension in the transverse plane. As the birth canal geometry changes along the sagittal plane, we address the upper part (inlet), the middle part and the lower part (outlet)…”

“…Maternal anthropometric measures as maternal height, foot length, head circumference and Michaelis transverse diameter might help in detecting risk of CPD [26]. Younger females have narrow pelvis more often than older females [17].…”