Analysis of high load injury of thoracolumbar spine in pilots during ejection process
In an attempt to accurately analyze high load,the finite element model established by clinical CT data was unable to capture the fine geometric features and heterogeneous properties of vertebrae,leading to an inaccurate analysis of the high rate of thoracolumbar spine injuries on fighter pilots during ejection.A finite element model of the thoracolumbar spine(T12-L2)was constructed based on nonlinear finite element,which represents the cortical thickness,cortical density,and cancellous bone density of specific-objects,to analyze the biomechanics of high load on the thoracolumbar spines of pilots during ejection.The object-specific finite element model was constructed based on the CT data of the thoracolumbar spine,and the cortical bone thickness and density values obtained from cortical bone mapping(CBM)were incorporated into the CT-based finite element modeling process of the thoracolumbar spine,and the elastic modulus of each element was calculated according to the Hounsfield units(HU)value to realize the heterogeneous assignment of material.By using the same loads and boundary conditions as those found in published in vitro studies,the model's correctness was confirmed.A Additionally,a simulation and computation were made of the biomechanical reaction of the thoracolumbar spine brought on by the ejection load in the upright,flexion,and extension physiological motion situations.The results showed that the vertebral load transfer characteristics were significantly different among the three different physiological motion conditions subjected to ejection loading,with the upright physiological motion conditions resulting in the least amount of direct acute injury to the vertebrae from the high load.
biomechanicsfinite element analysishigh load damagethoracolumbar spineejection
万方数据
维普
