模拟股骨置入人工关节股骨黏弹性实验研究

Experiment study on the viscoelasticity of OS femoris by simulating operation of inserting artificial joint

目的测量正常对照组股骨和以生物学和骨水泥固定置入人工关节组股骨标本压缩载荷-位移数据,为临床提供生物力学参数。方法利用电子万能试验机对正常对照组、股骨置入人工关节骨水泥固定组、股骨置入人工关节生物学固定组标本进行压缩和黏弹性实验研究。结果得出了在压缩状态下各组标本应力松弛、蠕变数据和曲线,并得出了各组标本的归一化应力松弛函数,归一化蠕变函数及曲线。结论骨水泥固定组纵向压缩位移比生物学固定小,说明骨水泥固定有较好的稳定性。人工关节置入股骨后,应力松弛、蠕变量均降低。骨水泥固定组较生物学固定组应力松弛、蠕变量大,其应力松弛、蠕变量丢失小,有利于稳定。

objective To measure the data of the compression loading and displacement in vertical direction,the cantilever bend of the normal group and inserting artificial joint group, and provide some useful imformation for clinic. Methods we proceed the compression and viscoelasticity experimental study on specimen of normal control group, bone cement fix group with femora posting joint prosthesis, biology fix group with femora posting joint prosthesis on the electron universal testing machine. Results We obtained the stress-time.strain-time curves under the compression condition. By using regression analysis method we obtained the reduced stress relaxation and creep functions and curves. Conclusions The compression in vertical direction displacement in inserting artificial joint fixed by bone cement is less than those of the group fixed by biological method. This describe that the bone cement＇ s fixing effect is better than that of the other. After inserting artificial joint, both os femoris＇ stress relaxation and creep quantity decreased. Those in the group fixed by bone cement are more than the group fixed by biological method, the lost amount of stress relaxation and creep were smallness and in favor of stabilize.