关节损伤对脊椎频率特性的影响分析

为研究腰段脊柱的生物力学特性,建立了一个脊椎T12-S1段的三维有限元模型.模型中对椎骨的外形结构和内部组成以及各种韧带均进行了详细建模描述,以便使之更接近人体脊椎的真实情况.研究结果表明:在考虑人体上身质量的情况下,脊椎T12-S1段三维有限元模型在垂直方向上的第一阶响应频率为7.68 Hz.椎间盘去髓核与小关节及其关节囊韧带切除均会不同程度地降低脊椎的整体响应频率.椎间盘去核比小关节及其关节囊韧带切除对模态频率的影响要大得多.模型的动态特性是符合人体脊椎的实际情况,可以用于人体脊椎的相关研究.

Influence of Joint Injury on Frequency Characteristics of the Spine

To investigate the biomechanic characteristics of human lumbar spine, a three-dimensional finite element model was developed for the spine segment T12-S1 to describe in details both of external configuration and internal components as well as all kinds of ligaments so as to show the real human spine as exact as possible. The analytical results indicated that the resonant frequency of the vertebra T12-S1 is 7.68 Hz in vertical direction. Both intervertebral denucleation and removal of facets and their capsular ligaments may decrease the resonant frequencies to different degrees, but the influence of the denucleation exerts on the frequencies much greater than that due to the removal. It was shown that the dynamic characteristics of the T12-S1 model comply with the actuality of human spine, so available to the relevant studies.