静压载荷下椎间盘中的粘弹性应力及变形分析

VISCOELASTIC STRESS AND RADIAL BULGE ANALYSES OF INTERVERTEBRAL DISC UNDER A CONSTANT COMPRESSION

本文建立了一个简化的椎间盘力学模型，在该模型中既考虑了椎间盘材料的重要性质──粘弹性又考虑了韧带的作用；并用线性粘弹性理论推导了椎间盘中的粘弹性应力及径向膨出的解析表达式。最后分别对正常、韧带加强、退变和致疝等情况下的应力分布及径向膨出进行了模拟计算；结果表明：椎间盘纤维环内的初始最大拉应力是造成其损伤的重要因素。

This paper has constructed a viscoelastic biomechanical model of the intervertebral disc. In this model, the author takes into account both viscoelasticity of the disc and action of the ligaments,and derives viscoelastic stress and radial bulge formulas when disc is subjected to a constant compression by using linear viscoelastic thoery, and anlyses the distribution of stress and radial bulge in healthy, consolidatory ligaments, degenerated and herniated disc.The computation results coincide with experimental data, and indicate that the maximal initial hoop stress is a major factor that causes dmc injury.