Biomechanical Model And Injury Study Of Human Lumbar Spine

The analysis of traffic accident statistics showed that the injury frequency of occupant lumbar spine was increased year after year.There is no experimental method and assessment criteria of lumbar spine injury in the vehicle crash safety regulations.And the lumbar spine of Hybrid III dummy,THUMS and GHBMC human body have not verified strict.It is necessary to establish a lumbar spine biomechanics model with more biological fidelity and could predict the lumbar spine injury of occupant in the collision accidents effectively.A more biological fidelity human lumbar spine model was established based on the anatomical structure and previous modeling method in the finite element research in this study.Full validations were proceeded according to the methods and results of cadaver experiment.Load rate,load position,lumbar spine posture,contact stiffness,contact friction coefficient with 4 levels were selected as injury impact factors in injury sensitivity analysis,which based on the load conditions of vehicle collision to study their relationships with lumbar spine injury risks.The sensitivity analysis results show that load rate has significant effect on lumbar spine injury,lumbar spine posture and contact stiffness has a certain effect on lumbar spine injury,lumbar spine injury risk is higher in the anterior and lateral load conditions,the impact of contact friction coefficient is not significant in local model research.Then,injury patterns and higher injury risk areas under compressive load,anterior bending,posterior bending,lateral bending were summarized and analyzed.A more biological fidelity human lumbar spine model was established and verified in this study.The most serious injury factors have been defined in the injury sensitivity analysis,and injury patterns and higher injury risk areas under different load conditions were summarized.The lumbar spine model established and verified in this study can be used for injury study and protective in the vehicle collision safety,military,aerospace,clinical medicine and other fields.