青年与老年人脊柱黄韧带黏弹性实验研究  

Experimental study on viscoelasticity of lumbar yellow ligament in young and old people

作　　者：王溪原[1] 苑福生[1] 张远石[1] 袁宏谋[1] 冯晰民[1] 

机构地区：[1]中国医科大学附属第四医院骨科,沈阳110032

出　　处：《医用生物力学》2011年第1期75-80,共6页Journal of Medical Biomechanics

摘　　要：目的比较青年与老年人脊柱黄韧带的应力松弛和蠕变黏弹性力学性质,为黄韧带退变的黏弹性力学机制提供依据。方法 20例老年腰椎退变病人黄韧带标本为老年退变组,20例青年腰椎外伤病人黄韧带为青年组,黄韧带标本均取自L4～L5间黄韧带。以1%/s的应变增加速度和0.5 MPa/s的应力增加速度分别对试样进行应力松弛和蠕变实验,实验温度设定为(36.5±0.5)℃。设定试验时间为7 200 s,采集90个应力松弛和蠕变数据。以统计分析和归一化的方法处理实验数据。结果青年组黄韧带7 200 s应力下降了1.42 MPa,老年组黄韧带7 200 s应力下降了1.91 MPa。青年组黄韧带7 200 s应变上升了3.39%,老年组黄韧带7 200 s应变上升了2.07%,两组7 200 s应力均下降,应变上升数据均有统计学意义(P<0.05)。应力松弛曲线是以对数关系变化的,蠕变曲线是以指数关系变化的。结论老年退变组黄韧带和青年组黄韧带相比,7 200 s应力松弛量和蠕变量降低,黏弹性力学性能发生改变。Objective To compare the stress relaxation and mechanical properties of creep viscoelasticity in the young and old’s spine and to provide the reference for the mechanical mechanism of viscoelasticity of yellow liga-ment degeneration.Method Twenty specimens of elderly patients with degenerative lumbar yellow ligament de-generation as the older group,and twenty specimens of young patients with lumbar yellow ligament injuries as the youth group were used respectively.All the yellow ligament specimens were from the yellow ligament between the fourth and fifth of lumbar vertebra（L4 ～ L5）.Stress relaxation experiment and creep experiment were conducted on the specimens by the strain increasing speed as 1% /s and the stress increasing speed as 0.5 MPa/s respec-tively.The experimental temperature was（36.5 ±0.5） ℃ and the experimental time was 7 200 s.Ninety stress relaxation and creep data were collected,and the data were dealt with the statistical analysis and normalization methods.Results The 7 200 s stress of yellow ligament in the youth group decreased by 1.42 MPa,while the 7 200 s stress of yellow ligament in the older group decreased by 1.91 MPa.The 7 200 s strain of yellow ligament in the youth group increased by 3.39%,while the 7 200 s strain of yellow ligament in the older group increased by 2.07%.The 7 200 s stress in two groups all increased and the increased strain data showed statistically signifi-cance（P 0.05）.The stress relaxation curve changed in the form of logarithm and the creep curve changed in the form of index.Conclusions The 7 200 s stress relaxation and creep in the yellow ligament of the older group all decreased and the mechanical properties of viscoelasticity changed.

关 键 词：黄韧带 应力松弛 蠕变 黏弹性 力学性能 

分 类 号：R318.01[医药卫生—生物医学工程]