Measured and estimated ground reaction forces for multi-segment foot models
Measured and estimated ground reaction forces for multi-segment foot models
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DOI：
10.1016/j.jbiomech.2010.08.003
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发表时间：
2010-12-01
影响因子：
2.4
通讯作者：
Richards, James G.
中科院分区：
文献类型：
--
作者：
Bruening, Dustin A.;Cooney, Kevin M.;Richards, James G.
精确测量足部离散区域下的地面反作用力对于开发更先进的足部模型非常重要，这可以提高我们对足部和踝关节功能的理解。为了克服当前设备的局限性，一些研究人员提出将压力垫与单个测力平台相结合，并使用比例假设来估计分区she力和自由力矩。在这项研究中，两个相邻的力平台被用来评估在正常步态的三段脚模型的比例假设的准确性。十七右脚进行了测试，使用有针对性的步行方法，隔离两个单独的关节：横向跗骨和跖趾。剪切力的均方根（RMS）误差高达6%体重（BW），发现使用比例假设，与最高的错误（峰值绝对误差高达12%BW）之间发生的前足和脚趾终端的立场。拇趾施加了一个小的制动力，与前脚的推进力相反，这是比例假设无法解释的。虽然该假设可能适合特定应用（例如步态分析模型），但重要的是要了解有关足部功能的一些信息可能会丢失。这些结果有助于突出假设的可能局限性。测量合奏平均分区剪切力在正常步态也首次提出。(C)2010爱思唯尔有限公司保留所有权利。
Accurate measurement of ground reaction forces under discrete areas of the foot is important in the development of more advanced foot models, which can improve our understanding of foot and ankle function. To overcome current equipment limitations, a few investigators have proposed combining a pressure mat with a single force platform and using a proportionality assumption to estimate subarea she forces and free moments. In this study, two adjacent force platforms were used to evaluate the accuracy of the proportionality assumption on a three segment foot model during normal gait. Seventeen right feet were tested using a targeted walking approach, isolating two separate joints: transverse tarsal and metatarsophalangeal. Root mean square (RMS) errors in shear forces up to 6% body weight (BW) were found using the proportionality assumption, with the highest errors (peak absolute errors up to 12% BW) occurring between the forefoot and toes in terminal stance. The hallux exerted a small braking force in opposition to the propulsive force of the forefoot, which was unaccounted for by the proportionality assumption. While the assumption may be suitable for specific applications (e.g. gait analysis models), it is important to understand that some information on foot function can be lost. The results help highlight possible limitations of the assumption. Measured ensemble average subarea shear forces during normal gait are also presented for the first time. (C) 2010 Elsevier Ltd. All rights reserved.