腰椎小关节接触模型的有限元分析

目的 建立腰椎4-5运动节段的有限元模型。分析小关节在不同状态下的生物力学特性。方法 获取一新鲜成人尸体腰椎4-5节段的断层CT扫描图像，利用此二维图像建立三维立体有限元模型。小关节部位处理为接触问题，模拟人体的不同承载状态对此模型进行计算处理。结果 小关节在不同状态下承担着不同的载荷，特别是在椎体轴向旋转运动状态下抗旋作用更明显。结论 小关节部位应该处理为接触问题，这有助于正确了解脊柱运动节段的生物力学特性。

Finite element analysis of lumbar facet joint contact model]

OBJECTIVE: To establish a finite element model of the fourth and fifth lumber segments in order to analyze the biomechanical characteristics of facet joints under different pressure loads. METHODS: CT sectional images of L(4-5) segments were obtained to construct a finite element model, adopting contact model to simulate the condition the superior and inferior facets were in. RESULTS: The facet joint exhibited different performances under different conditions, and more loads was forced on it when the model was twirled. CONCLUSION: The facet joints should be simulated as in condition of contact to help correct understanding of the biomechanical characteristics of the spinal segment.