摘要
目的分析垂直梯级载荷下人体全骨盆在双腿站立位时的轴向刚度。方法短期福尔马林固定全骨盆标本9具,按测试顺序编号1#~9#;分别在0~500 N、100 N的梯级载荷下对标本进行垂直轴向加载;利用电子万能试验机横梁传感器所采集的载荷-位移数据计算全骨盆轴向刚度。结果骨盆轴向刚度数值个体差异较大(P=0.815),400~500 N时轴向刚度为(443.6±190.9)N/mm;采用聚类分析法将骨盆分为3组(第1组:1#、2#、3#、5#、9#;第2组:4#、6#、8#;第3组:7#),经方差分析各组间的刚度有统计学差异(P<0.05);在梯级载荷下骨盆的轴向刚度变化趋势不同,第1组和第3组共6具标本轴向刚度随载荷增加而增大,第2组3具标本轴向刚度随载荷增加而先增大后减小。结论在生理范围内垂直梯级载荷下,人体全骨盆轴向刚度数值和变化规律存在较明显的个体差异,本组防腐骨盆标本轴向刚度总体上随载荷增大而增大。
Objective To analyze the axial stiffness of human pelvis that were set with the double support stand-ing posture and subjected to gradient vertical loads.Method Nine intact embalmed cadaver specimens were marked from 1# to 9# according to the test sequence,and then subjected to vertical static loads in the gradient of 100 N from 0 N to 500 N.The load-displacement data were collected by using the beam sensor of electronic uni-versal testing machine to calculate the axial stiffness of human pelvis.Results The differences of axial stiffness among individual pelvis were large(P =0.815),ranging from 240 N/mm to 776 N/mm.All the pelvic specimens were divided into three groups by cluster analysis(the first group: 1^#、2^#、3^#、5^#、9^#,the second group: 4^#、6^#、8^#,the third group: 7#).According to the processed results,there were statistical differences among the groups(P 0.05).The trends of pelvic axial stiffness were different under gradient loads.The axial stiffness of the first and third group,totally six specimens,increased with loads increasing;while the axial stiffness of the second group including three specimens increased first,but then decreased with the loads increasing.Conclusions There are significant individual differences in pelvic axial stiffness and its changing discipline within the physiological range;the cluster analysis can be used to analyze the changing discipline between the load and stiffness of human pel-vis;as a whole,the pelvic axial stiffness increased with the loads increasing.
出处
《医用生物力学》
EI
CAS
CSCD
2011年第1期57-62,共6页
Journal of Medical Biomechanics
基金
国家自然科学基金资助项目(81000795)
上海市基础研究重点项目(08JC1412800)
上海市科委科技攻关重点项目(074119633)
上海交通大学"医工(理)交叉研究基金"项目(YG2010MS09)
关键词
骨盆
生物力学
轴向刚度
梯级载荷
位移
Pelvis
Biomechanics
Axial stiffness
Gradient loads
Displacement