The 81st Annual Meeting of the American Association of Physical Anthropologists (2012)

3D reconstruction of Regourdou 1 pelvis: estimation of missing parts and first morphometric analysis


UMR 5199 PACEA, University of Bordeaux 1

Saturday 8:30-8:45, Grand Ballroom II Add to calendar

The Regourdou 1 pelvis is a newly discovered and described neandertalian pelvis. It bears us new opportunities to discuss numerous aspects of the morphology of the neandertalian pelvic belt, as locomotion and especially obstetrical functions. Because of the bones’ state of preservation, with missing parts and damaged structures, the Regourdou 1 pelvis has to be reconstructed to allow further studies.

Acquisition of Regourdou 1 pelvis’ CT-scans was performed with helical computed tomography; 54 landmarks were defined, in the light of our subsequent analyze of Regourdou 1 obstetrical dimensions. These landmarks have been collected using the software TIVMI from a comparative sample of 100 modern and 2 neandertalian (Kebara 2 and Feldhofer 1) virtual pelvises; then, the landmarks available were taken on Regourdou 1 pelvis. Three estimations of the missing landmarks of Regourdou 1 were realized, with three different estimation’s methods: a multiple regression method, the EM algorithm and the Thin-Plate Spline; the choice between these three reconstitutions was made under different criteria (mean error, intra-specific reconstruction). The statistical comparison of these three methods and the estimation of Regourdou 1 missing parts were performed using R software. This mathematical reconstruction is a first step to a triangular mesh generation and finally a 3D printed replication.

The 3D reconstruction of Regourdou 1 allows us to propose an estimation of obstetrical dimensions. The comparison of these dimensions, on one hand to the neandertalian and modern variability, on the other hand to newborns cranial data, brings us new informations on obstetrical function’s evolution.

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