This study is purposed to establish accurate finite element model of complete cervical spine with straight and normal physiological curvature. Select patients with straight cervical spine and collect their CT scan data. Using specially designed modeling system, a finite element model of complete cervical spine with straight physiological curvature was generated. The model was then mapped to build a normal curvature model by volumetric mesh deformation method based on differential property. Then, same boundary conditions were applied to make comparison. The results demonstrated that the active movement range of straight cervical spine decreased 24% ~33% , stress increases 4% ~90% . There are stress concentration at the facet joint cartilage, uncovertebral join and the disk. By using the special biomedical modeling system and new volumetric mesh deformation technology, a high quality finite element model of complete cervical spine with straight and normal physiological curvature was built up. The analysis results obtained from the model was useful to practical clinical diagnosis of cervical spine with straight physiological curvature.%建立生理曲度变直和曲度正常的颈椎全节段有限元模型,进行对比与分析.选取颈椎曲度变直患者采集CT数据,采用专用生物力学有限元软件构建高质量颈椎全节段模型,然后采用基于离散微分属性的体网格变形技术,将变直模型映射生成曲度正常模型,在进行有限元模型的验证后,用相同边界条件进行对比分析.结果表明,曲度变直模型活动度范围比正常范围减少16％～28％,应力增加4％～90％,C3-C4和C4-C5小关节、钩突关节、椎间盘容易出现应力集中,表明容易出现损伤和退化.通过使用新型建模软件和体网格变形技术,能方便构建生理曲度变直和正常模型,分析结果对临床诊断有指导意义.
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