Numerical Anthropometry Comparison between the THOMO PMHS and GHBMC Model

Various models of the human chest have been developed to evaluate injury risks or to assess innovative safety systems. In the frame of the EU FP7 project THOMO, a protocol has been established to determine relevant parameters of the human ribcage. This original method has been developed by combining CT-scan, 3D laser scan and μCT-scan to determine precisely the internal rib architecture. The main advantage of this approach is to provide a refined analysis of the bone distribution on the whole thorax. The different results will be compared in this paper with the Global Human Body Model data, based on its FE model. Global parameters are computed such as the rib length from 3D spline for each rib, cross section dimensions, volume measurement from 3D outer spline and global dimensions (lateral-medial-lateral and antero-posterior measurements). GHBMC is then compared to the 50 percentile male class, defined from THOMO data. For the local scale, a μCT-scan is used to investigate accurately the rib geometry and the cortical bone thickness. This μCT-scan method was applied on 2 hemi thorax of THOMO subjects. Through a cross section representation, different calculated parameters are considered (i.e. section area, trabecular bone area, cortical bone thicknesses). In order to compute the cortical bone ratio, the cortical bone area is generated using the inner and outer B-spline curves. A cortical bone thickness distribution map is made along the rib. GHBMC thorax FE model was investigated using the same local analysis to compare results with THOMO database.