Morphometric analysis of pelvic sexual dimorphism in a contemporary Western Australian population

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Abstract

Requisite to routine casework involving unidentified skeletal remains is the formulation of an accurate biological profile, including sex estimation. Choice of method(s) is invariably related to preservation and by association, available bones. It is vital that the method applied affords statistical quantification of accuracy rates and predictive confidence so that evidentiary requirements for legal submission are satisfied. Achieving the latter necessitates the application of contemporary population-specific standards. This study examines skeletal pelvic dimorphism in contemporary Western Australian individuals to quantify the accuracy of using pelvic measurements to estimate sex and to formulate a series of morphometric standards. The sample comprises pelvic multi-slice computer tomography (MSCT) scans from 200 male and 200 female adults. Following 3D rendering, the 3D coordinates of 24 landmarks are acquired using OsiriX® (v.4.1.1) with 12 inter-landmark linear measurements and two angles acquired using MorphDb. Measurements are analysed using basic descriptive statistics and discriminant functions analyses employing jackknife validation of classification results. All except two linear measurements are dimorphic with sex differences explaining up to 65 % of sample variance. Transverse pelvic outlet and subpubic angle contribute most significantly to sex discrimination with accuracy rates between 100 % (complete pelvis - 10 variables) and 81.2 % (ischial length). This study represents the initial forensic research into pelvic sexual dimorphism in a Western Australian population. Given these methods, we conclude that this highly dimorphic bone can be used to classify sex with a high degree of expected accuracy. © 2014 Springer-Verlag Berlin Heidelberg.
Original languageEnglish
Pages (from-to)861-872
JournalInternational Journal of Legal Medicine
Volume128
Issue number5
Early online date2 May 2014
DOIs
Publication statusPublished - Sep 2014

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  • Projects

    Novel Approaches to the Forensic Identification of Human Remains: Integration of Studies of Bone Form and Chemistry

    Franklin, D., Oxnard, C., Watling, J., O'Higgins, P., Cardini, A., Hoogewerff, J., Green, H. & Marks, M.

    Australian Research Council

    1/01/1031/12/12

    Project: Research

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