摘要：

BACKGROUND: The motion of human cervical spine is the change of biomechanics and displacement among multiple sections. To establish the finite element model of multiple sections and multipoint mechanical loading can provide a high accuracy model and scientific analysis method for the biomechanics research of the cervical spine.
OBJECTIVE: To establish the finite element model of the human lower cervical spine (C4-C6), and put forward multipoint mechanical loading on this basis.
METHODS: CT images of normal cervical spine (C4-C6) were got as data sources. Three-dimensional finite element model was established by using Mimics10.0 and Ansys11.0 finite element analysis software, and the model was took under multipoint mechanical loading to imitate the motion of axial, bucking, extension, side-bending and twisting which occur in physiological condition. Change of the stress and the displacement were analyzed under different motion of lower cervical spine (C4-C6).
RESULTS AND CONCLUSION: The finite element model which showed geometric shape lifelike, repeated the anatomical structure of cervical spine and had well geometric similarity to physical organization. Under different mechanical loading conditions (Se, Sz), the stress of bucking and extension was bigger than side-bending, and side-bending was bigger than axial. And the level of displacement was very low, this may because of the stress of axial load was very small. The methods of established the finite element model of the human lower cervical spine (C4-C6) and took multipoint mechanical loading are scientific and effective. This provides a high accuracy model and scientific analysis method for the biomechanics research of the cervical spine.

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