Xu Chao, Wen Xin-Xin, Huang Lu-Yu, Shang Lei, Cheng Xi-Xia, Yan Ya-Bo, Lei Wei
Department of Orthopedics, Xijing hospital, Fourth Military Medical University, No.15 Changle West Road, Xi'an, Shaanxi 710032 China.
Department of Orthopedics, No. 463 Hospital of Chinese PLA, Shenyang, 110042 China.
J Foot Ankle Res. 2017 Jul 17;10:30. doi: 10.1186/s13047-017-0209-2. eCollection 2017.
The Footscan® platform system is one of the most commonly used clinical tools for the measurement of the foot pressure. The present study was designed to assess the repeatability of the system and identify the range of loading parameters observed in the normal foot.
Measurements were collected from 32 healthy participants, 15 females and 17 males, twice at an interval of 1 week. Peak pressure (PP), contact time (CT), contact area (CA), pressure-time integral (PTI), and maximum force (MaF) were recorded; these parameters were investigated in 10 areas of the foot: medial heel, lateral heel, midfoot, first to fifth metatarsals, hallux, and toes 2-5. The intra-session repeatability was evaluated by calculating the intraclass correlation coefficients (ICCs) and coefficients of variation (CVs) across the three repeated trials within the same session. The inter-session repeatability was assessed using the average of the three trials in each session to determine the ICCs and CVs.
The ICCs showed moderate to good repeatability for every variable of interest, and the CVs were all <28%. The highest zones of PP were found under the second and third metatarsals, followed by the medial heel. The CT was 68.5-82.8% of the total stance time under the metatarsal heads. CA was highest under the midfoot, PTI was highest under the second metatarsal, and MaF was highest under the medial heel.
Footscan® platform system was found to be repeatable. Thus, it can be used as a valuable tool in the assessment of plantar pressure distribution, and the normal values of the foot loading parameters identified in this study can be employed to provide a reference range for the gait analysis performed by the Footscan® system.
Footscan®平台系统是测量足部压力最常用的临床工具之一。本研究旨在评估该系统的可重复性，并确定正常足部观察到的负荷参数范围。
从32名健康参与者（15名女性和17名男性）收集测量数据，间隔1周进行两次测量。记录峰值压力（PP）、接触时间（CT）、接触面积（CA）、压力-时间积分（PTI）和最大力（MaF）；在足部的10个区域对这些参数进行研究：内侧足跟、外侧足跟、中足、第一至第五跖骨、拇趾以及第二至五趾。通过计算同一次测量中三次重复试验的组内相关系数（ICC）和变异系数（CV）来评估测量期间的可重复性。使用每次测量中三次试验的平均值来评估测量期间的可重复性，以确定ICC和CV。
ICC显示每个感兴趣变量的重复性为中等至良好，CV均<28%。PP最高的区域位于第二和第三跖骨下方，其次是内侧足跟。CT占跖骨头下方总站立时间的68.5-82.8%。CA在中足下方最高，PTI在第二跖骨下方最高，MaF在内侧足跟下方最高。
发现Footscan®平台系统具有可重复性。因此，它可作为评估足底压力分布的有价值工具，本研究中确定的足部负荷参数正常值可用于为Footscan®系统进行的步态分析提供参考范围。
