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.

This study aims to investigate the friction and wear characteristics of knee joint prostheses under ISO standard gait and stair-climbing motion loads. First, research and analysis were conducted on the frequency of daily activities, as well as the kinetics and kinematics of such activities. Then, using a knee joint prosthesis wear testing machine, wear tests were performed on a novel Vitamin E-type knee joint prosthesis: 5 million standard gait wear cycles and 2 million stair-climbing wear cycles. The test results demonstrated that the wear rate during the normal gait phase was 4.34 mg/mc, while that during the stair-climbing motion phase reached 5.95 mg/mc. Compared to standard gait, stair-climbing motion exerted a greater impact on the wear volume of the meniscal liner. Moreover, the surface morphology of the meniscal liner changed significantly after stair-climbing wear, with striped patterns and local depressions appearing on its surface. This surface morphology is much closer to that observed on clinically retrieved meniscal liners. Currently, the standard wear testing protocols for knee joint prostheses are not comprehensive enough, and further improvements to the overall testing scheme are required to better reflect the practical significance of in vitro wear testing.

搜集汇总

背景与挑战

背景概述

该数据集通过实验对比了维生素E型人工膝关节在ISO标准步态和上楼梯运动下的磨损情况，测试显示上楼梯运动的磨损率（5.95 mg/mc）高于标准步态（4.34 mg/mc），并导致半月板衬垫表面形貌发生显著变化，更接近临床实际。研究强调了当前人工膝关节磨损测试方法的局限性，为改进体外测试方案提供了数据支持。