张力侧中空股骨柄假体的研制及体外静力实验研究  

Empirical study on intensity strength of weight-loading of a newly designed femur prosthesis with cage on the tension side

作　　者：蔡谞[1] 崔健 王岩[1] 牟明威 樊宇平[1] 王达文[1] 柴伟[1] 

机构地区：[1]解放军总医院骨科,北京100853 [2]百慕高科技股份有限公司京航生物医学工程中心

出　　处：《中华骨科杂志》2006年第5期332-335,共4页Chinese Journal of Orthopaedics

摘　　要：目的检验自行研制的张力侧中空股骨柄假体的力学强度,为改进设计和临床应用奠定基础。方法采用人工髋关节制造标准,引进中空理念,以国人股骨近端几何特征参数为依据,设计出直柄、近端紧压配合、准远端固定加界面骨整合及中空部分骨融合的张力侧中空股骨柄假体,选用Ti-6Al-4V锻造毛坯,以CAD/CAM数控工艺机械加工。随机抽取不同大小的0、1、2、4号假体各一件,配以直径26mm(+0、+2)球头,使用INSTRON4507200kN万能材料实验机在股骨柄近端外倾18°位分别施加1、3～8倍体重的7种载荷进行静载强度及强度极限试验。结果设计并试生产标准化系列张力侧中空股骨柄假体。在8BW载荷下,各假体柄均未出现塑性变形和裂纹。1号和4号假体柄的静载强度极限分别达到57.6kN和81.8kN。假体颈部尺寸相对较小时,假体破坏首先发生在颈根部的应力集中区;而当假体颈部尺寸足够大时(4号),假体的断裂发生在张力侧中空部分融合小孔的应力集中区。结论张力侧中空股骨柄假体的承载强度并未因其近端张力侧存在带孔洞的空腔而遭到破坏,能满足日常活动中人体施加于髋关节的载荷。Objective To inspect the loading strength of a newly designed femur prosthesis with cage on the tension side for improving its design and clinical application. Methods A straight cementless femur prosthesis of total hip joint with cage on the proximal tension side was designed according to the geometry parameter of proximal femur of Chinese people. The concepts of proximal press-fit fixation, hypo-distal fixation, interface osteointegration and bone fusion with the cage were adopted in the prosthesis. Ti-6A1- 4V forging workblanks were used in manufacturing with CAD/CAM technology. One prosthesis was taken randomly from finished products of each No.0, 1, 2, 4 group（with different） matched by （＋0, ＋2） head with 26 mm diameter. The weight-loading test was done at 1 body weigth （BW）, 3-8 BW respectively on INSTRON 4507 200kN univeral experiment machine universal material study machine with the prosthesis in a extraversion position of 18% Results No plastic deformation and crack appeared when any of the prosthesis bear 1, 3-8 BW loading. The ultimate loading limit of No.1 and No.4 prosthesis was 57.6 kN and 81.8 kN respectively. Destroy first appeared at the stress collection area of the neck when the size of neck was relatively small. When the size of neck was big enough, break occurred at the stress collection area of the cage on the tension side. Conclusion The intensity strength of weight-loading of the femur prosthesis can not be destroyed even with a cage on the proximal tension side. It can endure the weight loading of hip in daily activities, and even strengthen due to the bony growing in proximal femur.

关 键 词：人工关节 髋关节 生物力学 抗压强度 

分 类 号：R687[医药卫生—骨科学]