Cross-validation of a portable, six-degree-of-freedom load cell for use in lower-limb prosthetics research
Cross-validation of a portable, six-degree-of-freedom load cell for use in lower-limb prosthetics research
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DOI：
10.1016/j.jbiomech.2014.01.048
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发表时间：
2014-04-11
影响因子：
2.4
通讯作者：
Hansen, Andrew H.
中科院分区：
文献类型：
--
作者：
Koehler, Sara R.;Dhaher, Yasin Y.;Hansen, Andrew H.
iPecs（TM）测力传感器是一种重量轻、六自由度的力传感器，设计用于通过通用安装接口轻松安装到内骨骼假体中。与早期的系留系统不同，它能够进行无线数据传输和板载存储器存储，这有助于其在临床和现实环境中的使用。然而，到目前为止，iPecs（TM）测力传感器的有效性尚未严格建立，特别是对于代表典型假体使用的载荷条件。本研究的目的是通过与典型步态分析实验室的力和力矩测量值进行交叉验证，评估iPecs（TM）测力传感器在原位人体受试者测试期间的准确性。具体来说，一个人的步态力学与经胫骨截肢同时测量使用iPecs（TM）的负荷传感器，多个地板安装的力平台，和三维运动捕捉系统。总的来说，iPecs（TM）测量的力和力矩与步态分析实验室测量的力和力矩高度相关（r>0.86），在所有力和力矩通道上，RMSE分别小于3.4%和5.2%满量程输出。然而，尽管有这种有利的比较，灵敏度分析的结果表明，在iPecs（TM）数据将在不同于其自身的坐标系（例如，逆动力学分析）。爱思唯尔有限公司出版
The iPecs (TM) load cell is a lightweight, six-degree-of-freedom force transducer designed to fit easily into an endoskeletal prosthesis via a universal mounting interface. Unlike earlier tethered systems, it is capable of wireless data transmission and on-board memory storage, which facilitate its use in both clinical and real-world settings. To date, however, the validity of the iPecs (TM) load cell has not been rigorously established, particularly for loading conditions that represent typical prosthesis use. The aim of this study was to assess the accuracy of an iPecs (TM) load cell during in situ human subject testing by cross-validating its force and moment measurements with those of a typical gait analysis laboratory. Specifically, the gait mechanics of a single person with transtibial amputation were simultaneously measured using an iPecs (TM) load cell, multiple floor-mounted force platforms, and a three-dimensional motion capture system. Overall, the forces and moments measured by the iPecs (TM) were highly correlated with those measured by the gait analysis laboratory (r>0.86) and RMSEs were less than 3.4% and 5.2% full scale output across all force and moment channels, respectively. Despite this favorable comparison, however, the results of a sensitivity analysis suggest that care should be taken to accurately identify the axes and instrumentation center of the load cell in situations where iPecs (TM) data will be interpreted in a coordinate system other than its own (e.g., inverse dynamics analysis). Published by Elsevier Ltd.