脊柱交界区终板抗压强度分布规律的生物力学研究

目的:探讨脊柱交界区终板不同位点抗压强度及其分布规律。方法:选用5具成年男性新鲜脊柱标本的颈胸段、胸腰段及腰骶段,共65个椎体125个终板,采用环形取点的方式,对每个终板平面的49个测试点用直径1.5mm的平底压头进行连续压缩加载试验,获得最大压缩力,所得数据进行统计分析。结果:以椎体为单位,颈胸段终板从C4开始抗压强度逐渐下降,至C7达到最低点,C7～T1明显升高。胸腰段各椎体终板的抗压强度呈依次上升趋势,腰骶段L3、L4终板抗压强度继续上升,L5出现降低,S1节段再次升高。颈胸段与胸腰段抗压强度均小于腰骶段(P<0.01)。上下终板抗压强度变化趋势相似。各段椎体抗压强度下终板强于上终板(P<0.01)。椎间隙相邻面上一椎体下终板的抗压强度大于下一椎体上终板(P<0.05)。由内至外,抗压强度逐渐增大(P<0.05)。颈胸段和腰骶段的后部终板抗压强度大于前部,而胸腰段为前部大于后部(P<0.05)。结论:不同节段终板的抗压强度分布规律不同,临床安放椎间置入物时需注意置入物的大小及放置位置。

Stress distribution of endplate at cervicothoracic,thoracolumbar and lumbosacral junction:a biomechanical study

Objective:To investigate the stress distribution of endplate at cervicothoracic,thoracolumbar and lumbosacral junction.Method:A total of 65 vertebral bodies(125 endplates) from 5 intact human vertebrae(C4-T1,T11-L2,L3-S1) was used for test,49 test points at each endplate were indented by using a 1.5mm-diameter plane indenter,a continuous load was added in all specimenand,the results were processed by statistical analyses.Result:The failure load distributions of endplates varied significantly among the three...