维生素 E型人工膝关节在ISO标准步态与上楼梯运动下的磨损情况对比

为研究人工膝关节假体在ISO标准步态与上楼梯运动负载下的摩擦磨损情况，通过对日常活动频次及动力学和运动学的研究与分析，基于人工膝关节磨损试验机，以新型Vitamin E型人工膝关节为对象进行500万次标准步态磨损测试加200万次上楼梯运动磨损测试. 结果表明正常步态阶段的磨损率为4.34 mg/mc，上楼梯运动阶段的磨损率为5.95 mg/mc. 上楼梯运动相比标准步态对半月板衬垫的磨损量造成更大的影响，半月板衬垫表面形貌相较标准步态磨损后表面形貌也发生了显著变化，出现了条纹图案和局部凹陷，这种表面形貌结果更接近于临床半月板衬垫取出物的表面形貌，目前对于人工膝关节假体的标准磨损测试方式不够全面，需要进一步改进整个测试的方案才能更好地体现体外磨损测试的意义. 

Comparison of the Wear Performance of the New Vitamin-E Doped Insert under Standard Gait and Stair Climbing

To study the friction and wear of artificial knee joint prosthesis under ISO standard gait and stair climbing. Based on the research and analysis of daily activity frequency, dynamics and kinematics, using artificial knee joint wear test machine, a new Vitamin E type artificial knee joint was underwent 5 000 000 standard gait wear test and 2 000 000 stair climbing wear test. The wear rate in the normal gait phase was 4.34 mg/mc and the wear rate in the stair climbing phase was 5.95 mg/mc. Compared with the standard gait, the movement of the stair climbing has a greater impact on the wear of the insert. The surface morphology of the insert has also changed significantly compared with the standard gait after wearing, and a striped pattern appears and pitting, this surface morphology result is closer to the surface of clinical insert extractions. At present, the standard wear test method for artificial knee joint prostheses is not comprehensive enough, and it needs to be improved to reflect the significance of in vitro wear testing better.