人体皮质骨/纯钛接触副径向微动损伤研究

对新鲜人股骨皮质骨对纯钛球(直径10mm)接触副,在12mm/min加载速度下,分别以最大法向载荷100,200,300,400N进行径向微动实验研究。在动力学特性分析的基础上,用激光共聚焦显微镜和扫描电镜观察皮质骨表面的磨痕形貌。结果显示:随着载荷的增加,股骨皮质骨表现出不同的界面变形行为,损伤随之加重,而且裂纹的产生存在一个临界载荷;裂纹在骨表面主要有4种生长方式,以沿粘合线生长最常见。讨论了减缓骨/种植体界面径向微动损伤的措施,表明降低界面应力和种植体表面改性有利于减缓骨/种植体界面径向微动损伤。

A Study on Radial Fretting Damages of the Counter-pairs of Human Cortical Bone against Pure Titanium

Radial fretting tests of the counter-pairs of fresh cortical bone of human femur against pure titanium ball(diameter of 10 mm)were carried out,under the maximumal normal loads of 100,200,300 and 400 N respectively at a constant speed of 12 mm/min.Based on the analyses of the kinetic behaviours,the fretting scars of the cortical bone were examined by laser confocal scanning microscope(LCSM)and scanning electron microscope(SEM).The results display that the cortical bone presents different deformations between the interfaces and the damages are in an aggravating manner with the increase of the normal loads.The microcracks form at a critical load,and there are four crack propagating ways presented on the surface of bone specimens,among which the cement line propagating way is most popular.The methods to reduce the damages caused by radial fretting on the bone-implant interfaces were discussed,it is found that it is helpful to reduce the radial fretting on the bone-implant interfaces by reducing interface stress and modifying the implant surface.