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The Lower Limb Model for Safety (LLMS) is a finite element model of the lower limb developed mainly for safety applications. It is based on a detailed description of the lower limb anatomy derived from CT and MRI scans collected on a subject close to a 50th percentile male. The main anatomical structures from ankle to hip (excluding the hip) were all modeled with deformable elements. The modeling of the foot and ankle region was based on a previous model Beillas et al. (1999) that has been modified. The global validation of the LLMS focused on the response of the isolated lower leg to axial loading, the response of the isolated knee to frontal and lateral impact, and the interaction of the whole model with a Hybrid III model in a sled environment, for a total of nine different set-ups. In order to better characterize the axial behavior of the lower leg, experiments conducted on cadaveric tibia and foot were reanalyzed and experimental corridors were proposed.

The aim of this work is to validate a new 3D anatomic human head model by simulating a direct head impact of a Nahum's experiment and then to replicate the head impact caused by a motorcycle accident. At the validation level, model responses were compared with the measured cadaver test data in terms of impact force, head acceleration and five epidural pressures. Model response duplicate closely Nahum's experimental head response. After this validation, a numerical replication of a real head impact in motorcycle accident was realized. This simulation was based on the experimental accident reconstruction executed by the Transport Research Laboratory (UK). The results of this simulation were compared to the medical observations for the injured motorcyclist considered in this study. In this motorcycle accident replication, a good correlation was found between numerical head response, in terms of intracranial stress, and observed brain injuries in autopsy.