沙疗对关节炎兔股骨力学性能的影响及其有限元分析  

Effect of sand therapy on femur mechanical properties of arthritis in rabbits and finite element analysis

作　　者：孔春元[1] 迪丽娜尔·马合木提[1] 卫荣[2] 

机构地区：[1]新疆大学机械工程学院力学教研室,乌鲁木齐830008 [2]新疆医科大学第一附属医院中医科,乌鲁木齐830054

出　　处：《中南大学学报（医学版）》2009年第1期8-12,共5页Journal of Central South University ：Medical Science

基　　金：国家自然科学基金(30760322)~~

摘　　要：目的:研究沙疗对患有关节炎兔子股骨力学性能的影响。方法:新西兰兔右后膝石膏固定6周,6周后拆石膏,再随机分成,沙疗组(Ⅰ组),对照组(Ⅱ组)。Ⅰ组预埋沙治疗20d,Ⅱ组不作任何处理(自由活动),20d后取试件,沙疗组7个试件,对照组5个试件进行压缩试验。得到两组σ-ε曲线,然后进行有限元分析观察材料变形、应力场分布云图。结果:沙疗组在压缩时表现出较高的抗压强度,对照组最大压应力统计结果低于沙疗组(P<0.05);在压缩实验时,沙疗组骨骼出现裂纹甚至密质骨从材料上脱落后,内部材料仍有较大的承载能力,对照组骨骼则更多表现为脆性断裂;沙疗组有限元模型的长半轴上所受的应力比短半轴大,试件在长半轴上先破坏,从长半轴方向断裂的可能性增加。结论:沙疗有助于股骨材料力学性能的改善。Objective To determine the effect of sand therapy on the changes the femur mechanical properties of arthritis in rabbits in treatment. Methods Right knees of New Zealand rabbits were fixed for 6 weeks by plaster, and taken off after 6 weeks. The rabbits were divided into a sand therapy group and a control group. The sand therapy group was treated for 20 d, the control group did not receive any treatment. After 20 days, 7 workpieces were taken from the sand therapy group, and 5 from the control group. After compression experiment, σ-ε curves were obtained. Finite element method was used to analyze the stress cloud and the deformation cloud. Results The sand therapy group showed high compressive strength. The stress of the control group was lower than that of the sand therapy group （P 〈 0. 05 ）. When the surface materials were destroyed, the workpieces from the sand therapy group still bore large load, which matched the property that bone material was a typical multi-storey composite material. The stress cloud also found that the long axle suffered larger stress than the short axle, and the workpieces were more likely destroyed from the long axle. Conclusion Sand therapy can improve the mechanical properties of the bone.

关 键 词：股骨 压缩强度 有限元 应力 

分 类 号：R684.3[医药卫生—骨科学]