The ISO 14242-1 standard specifies fixed, simplified, sinusoidal motion and double-peak load cycles for wear testing of total hip prostheses. In order to make the wear simulation more realistic, random variation was added for the first time to the motion and load control signals of a hip joint simulator. For this purpose and for the simulation of various daily activities, computer-controlled, servo-electric drives were mounted on a biaxial hip simulator frame and successfully introduced. Random variation did not result in a statistically significant difference in the wear factor of large diameter VEXLPE liners compared with fixed sinusoidal waveforms. However, level walking according to biomechanical literature surprisingly resulted in a 134 per cent higher, and jogging in a 57 per cent lower wear factor compared with the fixed sinusoidal waveforms. These wear phenomena were likely to be caused by a variation in the lubrication conditions and frictional heating. Simplified motion waveforms may result in an underestimation of wear in walking.

ISO 14242-1标准规定了固定，简化的正弦运动和双峰值负​​荷循环，以进行整个髋关节假体的磨损测试。为了使磨损模拟更加逼真，首次在髋关节模拟器的运动和负荷控制信号中添加了随机变化。为此，为了模拟各种日常活动，将计算机控制的伺服电驱动器安装在双轴髋模拟器框架上并成功引入。与固定的正弦波形相比，随机变化不会导致大直径VEXLPE衬套的磨损因子有统计学上的显着差异。但是，根据生物力学文献，水平行走令人惊讶地导致其高出134％，与固定的正弦波波形相比，慢跑的磨损系数降低了57％。这些磨损现象很可能是由润滑条件和摩擦加热的变化引起的。简化的运动波形可能会低估步行中的磨损。