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Two heads are better than one. Investigation on sexual dimorphism of craniometric variables through osteometry and 3D scanning. Question of data acquisition repeatability

par Boucherie, Alexandra ;Polet, Caroline ;Lefèvre, Philippe ;Vercauteren, Martine
Référence One-day Symposium Forensic Anthropology Society of Europe (FASE) (22 Septembre 2018: Université Aix-Marseille, Marseille)
Publication Non publié, 2018-09-22

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Résumé :

The successful and complete establishment of the biological profile of human skeletal remains is a paramount step in forensic anthropology for the progress of an investigation. Sex assessment is one of the essential tasks undertaken by the forensic anthropologists. Although they can rely on pelvic bones which are considered as the most discriminant skeletal element between males and females, this task can turn out to be challenging when confronted with incomplete skeletons, with absent or fragmented bones - especially os coxae -, or with bones altered by physico-chemical mechanisms. To address these complex but frequent cases, this research aims to develop an alternative sexing method by investigating sexual dimorphism of another anatomical region known to be both sexually discriminant and more commonly preserved: the cranial base (i.e. occipital and temporal bones). In this matter, our on-going doctoral research plans to analyse more than 500 skulls (subadults and adults) from 7 osteological reference collections from Europe. To reduce subjectivity induced by qualitative criteria previously studied, this study proposes to develop a metrical approach combining both traditional tools and new imaging technologies (surface scanning and tomodensitometry). Here, we aim to present part of our preliminary results which are responding to the question of the data acquisition repeatability. Four osteological documented collections of our corpus, namely from Belgium, Switzerland and France, have been examined so far. A set of 66 metrical parameters was collected several times either with a sliding caliper and/or on surface scans (©lhpFusionBox). To pinpoint which parameters entail less intraobserver errors-measures an intraclass correlation coefficient (ICC) was calculated for each collection. This step is crucial to ensure the validity of our protocol and is essential to underline which measurements are appropriate to be included in the following discriminant function analyses. Further investigations on the whole corpus will be undertaken in order to evaluate the discriminant power of occipital, temporal and bony labyrinth metrical traits for sex identification.