骨水泥振动器对提高骨水泥-骨界面结合强度的疲劳实验研究

Study of the binding intensity of bone-cement interface increased by bone cement oscillator in fatigue experiment

[目的]研究骨水泥灌注过程中骨水泥振动器振动灌注后骨水泥-骨界面的结合情况,通过疲劳实验力学检测界面结合强度。[方法]新鲜猪股骨60根,30%、50%、70%最大压力时,分别分为实验组和对照组,每组各10根。将猪股骨通过初步制备后开髓,截取统一标准骨段,实验组灌注骨水泥过程中置入骨水泥振动器振动25 s,对照组不置入振动器,并进行力学检测,比较实验组与对照组骨水泥-骨界面结合强度。[结果]30%、50%最大压力时实验组与对照组疲劳次数相比较差异显著(P<0.001),而70%最大压力时实验组与对照组比较差异无统计学意义(P>0.05)。[结论]骨水泥振动器能提高骨水泥-骨界面结合强度,对减少人工假体远期无菌性松动具有一定的临床意义。

[ Objeetive] To evaluate the effect of bone cement oscillator on increasing bone cement-bone interface binding intensity. [Method]Sixty fresh femoral bones of adult pig were randomly divided into experiment group and control group under the 30% ,50% ,70% ultimate shear strengh of the cement/bone. There were 10 samples in each subgroup. Mechanics test was performed by MTS-810 material testing machine, and the binding intensity of bone cement-bone interface in oscillating cement-bone interface binding intensity in experiment group was compared with control group. [ Result] Mechanics test showed bone cement group were significantly stronger than control group under the 30% ,50% ultimate shear strengh of the cement-bnne （P 〈 0.001 ） ,but the difference was not significantly under the 70% ultimate shear strengh （P 〉 0. 05 ）. [ Conclusion] Bone cement oscillator can increase binding intensity of bone-cement interface, and effectively reduce long-tern1 aseptic loosening of artificial prostheses.