Vempala Vibhavari, Liu Ming, Kamper Derek, Huang He
Annu Int Conf IEEE Eng Med Biol Soc. 2018 Jul;2018:3938-3941. doi: 10.1109/EMBC.2018.8513249.
Although fit of the socket-suspension system is critical to lower limb amputees, monitoring of the fit is largely based on user feedback, which is subjective and often unreliable. Pistoning, defined as the relative displacement between the socket and the residual limb, is a well-accepted indicator of the fit of the socket-suspension system. However, opacity and rigidity of everyday prosthetic sockets make measurement of pistoning a challenging task. In this paper, we describe the development of a pistoning evaluation procedure that relies on two motion capture systems: a magnetic motion capture system used to measure the motion of the residual limb and an optical motion capture system used to measure the motion of the socket. Through synchronization of the two motion capture systems, the motion of the residual limb relative to the socket can be determined to derive the amplitude of pistoning. Here, we evaluated the performance of our approach through repeated calibration and a treadmill walking task with an amputee. Results demonstrate that this procedure, which does not rely on radiography unlike some existing methods, can be used to evaluate the fit of amputees' everyday sockets.
尽管对于下肢截肢者来说，接受腔 - 悬吊系统的适配性至关重要，但对其适配性的监测很大程度上基于用户反馈，而这种反馈是主观的且往往不可靠。活塞运动，定义为接受腔与残肢之间的相对位移，是接受腔 - 悬吊系统适配性的一个公认指标。然而，日常假肢接受腔的不透明性和刚性使得活塞运动的测量成为一项具有挑战性的任务。在本文中，我们描述了一种活塞运动评估程序的开发，该程序依赖于两个运动捕捉系统：一个用于测量残肢运动的磁运动捕捉系统和一个用于测量接受腔运动的光学运动捕捉系统。通过两个运动捕捉系统的同步，可以确定残肢相对于接受腔的运动，从而得出活塞运动的幅度。在此，我们通过重复校准和对一名截肢者进行跑步机行走任务来评估我们方法的性能。结果表明，与一些现有方法不同，该程序不依赖于放射成像，可用于评估截肢者日常接受腔的适配性。
