Eshraghi Arezoo, Abu Osman Noor Azuan, Gholizadeh Hossien, Ali Sadeeq, Abas Wan Abu Bakar Wan
From the Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
Am J Phys Med Rehabil. 2015 Jan;94(1):1-10. doi: 10.1097/PHM.0000000000000134.
This study aimed to compare the effects of different suspension methods on the interface stress inside the prosthetic sockets of transtibial amputees when negotiating ramps and stairs.
Three transtibial prostheses, with a pin/lock system, a Seal-In system, and a magnetic suspension system, were created for the participants in a prospective study. Interface stress was measured as the peak pressure by using the F-socket transducers during stairs and ramp negotiation.
Twelve individuals with transtibial amputation managed to complete the experiments. During the stair ascent and descent, the greatest peak pressure was observed in the prosthesis with the Seal-In system. The magnetic prosthetic suspension system caused significantly different peak pressure at the anterior proximal region compared with the pin/lock (P = 0.022) and Seal-In (P = 0.001) during the stair ascent. It was also observed during the stair descent and ramp negotiation.
The prostheses exhibited varying pressure profiles during the stair and ramp ascent. The prostheses with the pin/lock and magnetic suspension systems exhibited lower peak pressures compared with the Seal-In system. The intrasystem pressure distribution at the anterior and posterior regions of the residual limb was fairly homogenous during the stair and ramp ascent and descent. Nevertheless, the intrasystem pressure mapping revealed a significant difference among the suspension types, particularly at the anterior and posterior sensor sites.
本研究旨在比较不同悬吊方法对经胫截肢者在通过坡道和楼梯时假肢接受腔内界面应力的影响。
在一项前瞻性研究中，为参与者制作了三种带有销/锁系统、密封嵌入系统和磁悬浮系统的经胫假肢。在通过楼梯和坡道时，使用F型接受腔传感器将界面应力测量为峰值压力。
12名经胫截肢者成功完成了实验。在上下楼梯过程中，密封嵌入系统的假肢观察到最大峰值压力。在上楼梯过程中，磁悬浮假肢系统在前近端区域产生的峰值压力与销/锁系统（P = 0.022）和密封嵌入系统（P = 0.001）相比有显著差异。在下楼梯和通过坡道过程中也观察到了这种情况。
假肢在上下楼梯和坡道时呈现出不同的压力分布。与密封嵌入系统相比，带有销/锁和磁悬浮系统的假肢峰值压力较低。在上下楼梯和坡道过程中，残肢前后区域的系统内压力分布相当均匀。然而，系统内压力映射显示不同悬吊类型之间存在显著差异，特别是在前后传感器部位。
