International Journal of Legal Medicine

, Volume 128, Issue 5, pp 861–872

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

Authors

    • Centre for Forensic ScienceThe University of Western Australia
  • Andrea Cardini
    • Centre for Forensic ScienceThe University of Western Australia
    • Dipartimento di Scienze Chimiche e GeologicheUniversità di Modena e Reggio Emilia
    • Hull York Medical SchoolUniversity of Hull
  • Ambika Flavel
    • Centre for Forensic ScienceThe University of Western Australia
  • Murray K. Marks
    • Centre for Forensic ScienceThe University of Western Australia
    • Department of General Dentistry, Graduate School of MedicineUniversity of Tennessee Medical Center
Original Article

DOI: 10.1007/s00414-014-0999-8

Cite this article as:
Franklin, D., Cardini, A., Flavel, A. et al. Int J Legal Med (2014) 128: 861. doi:10.1007/s00414-014-0999-8

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.

Keywords

Sex discrimination Forensic anthropology Pelvic measurements Computed tomography Population standards Sexual dimorphism

Copyright information

© Springer-Verlag Berlin Heidelberg 2014