摘要
背景:无论是股骨颈骨折内外固定,还是人工关节的研究都需要了解股骨颈松质骨应力松弛特性。股骨颈骨折后都需要以内固定或头固定机械进行固定治疗。目的:通过实验定量得出股骨颈应力松弛与时间的变化规律,为人工关节研究和内外固定提供黏弹性力学参数。设计、时间及地点:观察性实验,于2006-09在吉林大学力学实验中心完成。材料:股骨颈标本8个,由白求恩医科大学解剖室提供。方法:在日本岛津电子万能试验机上对股骨颈松质骨8个试样进行应力松弛实验。模拟人体体温36.5℃的温度场下进行实验,应力松弛实验的应变增加速度为50%/min。设定实验时间为7200s,采集100个数据以三参数模型处理实验数据。主要观察指标:应力松弛曲线,应力松弛与时间的变化规律。结果:股骨颈松质骨应力松弛,最初600s变化较快,之后应力缓慢下降,7200s应力松弛量为0.84MPa。结论:应力松弛曲线是以对数关系变化的,以三参数模型建立的股骨颈松质骨应力松弛方程能真实地反映其应力松弛特性。
BACKGROUND： No matter internal and external fixation of femoral neck fractures, or artificial joint research, needs to understand the femoral neck bone stress relaxation properties. Following femoral neck fracture, internal fixation or head fixed machinery carries should be applied for further treatment. OBJECTIVE： To measure the change law between femoral neck stress relaxation and time, in addition, to provide the viscoelasticity mechanics parameter for the joint prosthesis research and the internal and external fixation. DESIGN, TIME AND SETTING： The observation experiment was performed at the Mechanics Experiment Center of Jilin University between 15th and 26th in September 2006. MATERIALS： A total of 8 femoral neck specimens were provided by the Dissecting Room of Bethune Medical College. METHODS： The stress relaxation experiment was performed on the Shimadzu electron universal testing machines. With simulated temperature field of human body temperature at 36.5℃, stress was imposed on the samples by increase of 5%/min in 7 200 s. A total of 100 experimental data were collected. Creep equation was calculated using a three-parameter model. MAIN OUTCOME MEASURES： The stress relaxation curve, as well as the change law between femoral neck stress relaxation and time. RESULTS： The femoral neck bone stress relaxation changed quickly at the initial 600 s, afterward the stress dropped slowly, and the 7 200 s stress relaxation quantity was 0.84 MPa. CONCLUSION： Stress relaxation curves shows the logarithmic relation relative to time, establishment of the femoral neck bone stress relaxation equation according to three-parameter model can reflect the real stress relaxation properties.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2009年第2期272-275,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
