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机构地区:[1]吉林大学第二医院,吉林省长春市130042 [2]吉林大学南岭校区工程力学系,吉林省长春市130022
出 处:《中国组织工程研究与临床康复》2008年第48期9415-9418,共4页Journal of Clinical Rehabilitative Tissue Engineering Research
摘 要:背景:为避免人工假体置入后发生松动脱落现象,有必要进行松质骨的力学性质研究。目的:以三参数模型建立了应力松弛方程,比较正常股骨头和坏死后股骨头应力松弛性质。设计、时间和地点:观察性实验,于2006-05-15/20在吉林大学力学实验中心完成。材料:正常和坏死股骨头各8个标本,由白求恩医科大学解剖教研室提供。方法:在电子万能试验机上对正常与坏死股骨头松质骨各8个试样进行应力松弛实验。模拟人体体温在36.5℃的温度场下,以5%/s的应变增加速度对标本施加常应力,设定时间为7200s,采集100个实验数据。采用三参数模型计算应力松弛方程。主要观察指标:①应力松弛曲线。②正常和病态股骨头松质骨应力松弛量。结果:正常和坏死股骨头应力松弛曲线均以对数关系变化的,在最初600s应力变化较快,随时间延长应力缓慢下降,最后进入平衡阶段。坏死股骨头松质骨7200s应力松弛量小于正常股骨头松质骨。结论:三参数模型计算简便,能很好地拟合股骨头的应力松弛变化,通过建立这种理想化的方程,可以定量说明坏死股骨头的黏弹性较差。BACKGROUND: It is necessary to study mechanical properties of cancellous bone to prevent prosthesis loosening or obscission. OBJECTIVE: To compare the nature of stress relaxation between normal and morbidity femoral head following established stress relaxation equation with three-parameter model. DESIGN, TIME AND SETTING: The observation experiment was performed in the Mechanics Experiment Center of Jilin University from 15th to 20th in May, 2006. MATERIALS: Eight specimens of femoral head in each group were provided by the Department of Anatomy, Norman Bethune Medical University. METHODS: Electronic universal testing machine was used for stress relaxation test of 8 specimens of the femoral head in each group. With simulated temperature field of human body temperature at 36.5℃, stress was imposed on the samples by increase of 5%/s for 7 200 s. 100 experimental data were collected and to calculate stress relaxation equation using three-parameter model. MAIN OUTCOME MEASURES: Stress relaxation curve and stress relaxation quantity in normal and morbidity femoral head. RESULTS: The curve of stress relaxation of normal and the morbidity femoral head showed logarithmic relationship with significantly changes in the first 600 s, stress slowly decreased with the time and eventually reach equilibriums. The computation of stress relaxation equation showed that stress relaxation quantity of morbidity femoral head was lower than that in the normal femoral head at 7 200 s. CONCLUSION: Establishing stress relaxation equation with three-parameter model possesses the advantages of easy calculation and fitting stress relaxation changes well, which can quantitatively demonstrated poor viscoelasticity of morbidity femoral head.
分 类 号:R318[医药卫生—生物医学工程]
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