The Establishment And Appliment Of The Three-Dimensional Finite Element Model Of Atlas And Axis

Objective: To construct three-dimensional altas and axis finite element model and load the altas , analyze atlas fracture mechanism based on it.Methods: A healthy adult male volunteers (height 172cm, weight 66kg) served as simulation , firstly to rule out the possibility of spinal disease through X-ray and CT examination, secondly to make neck scan line with Siemens Somatom Sensation 16-slice spiral CT with slice thickness of 0.625mm, finally to use Medical three-dimensional reconstruction software(Materialise Mimics12.11) to manage the DICOM standard documents of altas and axis swatch that were scanned thin-layer CT to process them into the software inside ANSYS11.1 entities to generate three-dimensional finite element model. Respectively, in the former song, extension, extension, such as excessive under the condition of the atlas to be loaded, to observe the situation of stress suffered.Results: The model was composed of 22315 nodes, 15324 units, through the load analysis, no matter which the skull was, the largest Von Mises stress focused on the the anterior arch and the smaller was on the posterior arch and lateral mass.Conclusion: (1) we have built atlas and axis finite element model of geometric similarity, and can use it for biomechanical research. (2) posterior arch fracture is due to cervical hyperextension and axial with gravity, so that the posterior arch of cervical squeezed by inter-spinous process of axis and posterior occipital margin. (3) The axial loading from any direction will cause the anterior arch fracture first if it is big enough. Enough big force or over long time of force will result in burst fractures, such as the Jefferson fracture.