Abstract： Objective To evaluate the biomechanical stability of cervical spinous process fractures by finite element analysis.Methods The CT image of the cervical vertebrae of a 35-year-old male healthy volunteer was included.The six-sided three dimensional finite element model of the C0～T1 segment of the normal cervical vertebra was preliminarily established by Mimics 17,Geomagic Studio 2012,Hypermesh12 and ABAQUS 6.12,and was validated.Based on the validated three-dimensional finite element model,the model of the C7 spinous process fractures (involving lamina) was established by weakening the intensity of the mesh unit.The physiological load of flexion-extension,lateral flexion and rotation were performed on the normal and fractures models,respectively.The biomechanical stability of the spinous process fractures was analyzed by comparing the three-dimensional range of motion (ROM) and the displacement of the fractures nodes.Results In the C6-C7 segment,the ROM of the flexion,lateral flexion,and rotation of the fractures model diminished compared with that of the normal model,while the ROM of the extension slightly increased.In the C7-T1 segment,the ROM was significantly larger than that of the normal model except for the extension,and the change of ROM was significant.The remaining segments were almost identical to the normal model.Conclusion There is potential biomechanical instability in cervical spinous process fractures involving vertebral lamina.This condition should be differentiated from simple cervical spinous process fractures,diagnosed as early as possible,and given proper treatment .