The Study of Stress Analysis that Indirect Violence in the Base of Skull

Objective:Discuss the biomechanical basis and the common site of skull base fracture that was caused by the indirect force conveyed to the skull base through spine due to a fall from a high place or an impact on the hip region.Methods:Using the established finite element model of the skull base,according to the action and reaction equal principle,the degree of freedom on the upper portion of skull base was restricted.The bottom-up impacts on the occipital condyles was 100N,200N,300N,400Nrespectively.After caculating,enter the processor module to get the data and display the stress isogram.Then the stress pattern was shown when different indirect violences impact on the skull base.Results:Through different pressure distribution maps,it can be observed that the stress focuses on superior orbital fissure,jugular foramen and forame novale when the force is 100N.When the force is 200N,the stress focuses on the circumference of the above foramens or fissures and temporal squamar.When the force is 300N,the stress focuses on the lamina orbitalis of the frontal bone.When the force is 400N,the stress focuses on the expanding portions of the above.Conclusion:Through the analysis of the finite element,when the skull base impacts on the the occipital condyle due to the outside force,the stress is distributed on circumference of the superior orbital fissure,jugular foramen and forame novale and the thinner part of the temporal squamar and the lamina orbitalis of the frontal bone.This is consistent with the fact of the clinical skull base fracture commonly in anterior cranial fossa,middle cranial fossa.