【摘要】 对正常和坏死股骨头进行蠕变实验,为新型人工关节的研究和髋关节置换术提供蠕变力学特性参数。8个正常股骨头实验标本取自正常人新鲜尸体,男性,年龄22~28岁;8个股骨头坏死样本为股骨头坏死病人进行人工髋关节置换术后所遗弃,也为男性,年龄28~56岁。利用日本岛津电子万能试验机,在(36.5±0.5)℃条件下,以0.5MPa/s的应力增加速度对标本施加压力。在7200s的试验时间内,采集100个实验数据,描绘出蠕变曲线并计算蠕变参数。实验结果表明所有样本在最初600s内蠕变速度较快,之后缓慢上升,7200s时蠕变曲线基本保持平衡,蠕变量与时间呈指数关系。坏死组股骨头7200s蠕变量为0.61%,显著低于正常组的0.85%(P<0.05)。此结果证实股骨头坏死后其蠕变力学特性发生改变。更多还原

【Abstract】 The study on the creep mechanical properties of normal and avascular necrosis of the femoral head(ANFH) is necessary for artificial joint research and joint replacement.In this paper,we measured the creep values of femur.Sixteen experimental fresh femurs were taken from 8 normal male people,aged from 22 to 28 years old,and from 8 male patients,aged from 28 to 56 years old,after artificial joint replacement.Under temperature(36.5±0.5)℃,each specimen was tested with Daojin electronical experimental machine when the acceleration of stress was 0.5MPa/s.In total 7200s period,one hundred experimental data were collected and used for drawing the creep curves and processing the creep parameter.The experiments indicated the creep velocities of all samples were quicker in the early 600s period,and it became slow later until immovably at 7200s.During 7200s,the maximum creep value of pathological femoral head was 0.61%,that was lower than 0.85% of the normal femoral head(P<0.05).It is proved that the creep parameter changes after femoral head femoral head is necrotic.更多还原