Key Laboratory of Leather ChemistryMistry and Engineering (Sichuan University), Ministry of Education, Chengdu, China; National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, China.
National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu, China.
Gait Posture. 2020 Jul;80:7-13. doi: 10.1016/j.gaitpost.2020.05.007. Epub 2020 May 16.
Flatfoot has a very high incidence of obese children. Functional parameters such as plantar pressures and center of pressure (COP) are sensitive to foot type. However, previous foot biomechanical studies of obese children rarely excluded the flatfoot as a prerequisite of the participants involved.
This study aimed to determine whether it is essential to define flatfoot as a subject screening criterion in the foot biomechanical study for obese children.
Foot types were classified by arch index (AI). Totally 21 obese children with flatfoot (OF group) along with matched control groups of obese children with normal foot (ON group) and normal-weighted children with flatfoot (NF group) were selected from our database. Barefoot walking trails were conducted using Footscan® plate system. Peak force (PF), peak pressure (PP), pressure-time integral (PTI), contact area (CA) and COP data were recorded. Independent t-test and effect size were used to compare the data between the study group and the control groups. Intraclass correlation coefficient was used to measure the between-trail reliability for the dependent variables.
In comparison with the OF group, an upward trend for PF, PP and PTI was found for the ON group, while an opposite tendency for the NF group. The OF group displayed a significant larger CA under the midfoot region than the NF group even if there is no significant difference for AI. The OF group displayed a more medial shift of COP progression compared to the ON group. But no significant differences were found for COP parameters between the OF group and the NF group.
This study provided substantial evidence to support that prospective foot biomechanical research on the obese group needs to identify the flatfoot as one of the subject screening criteria to carry out more reliable results without producing confounding effects.
扁平足在肥胖儿童中发病率非常高。足底压力和中心压力（COP）等功能参数对足型敏感。然而，以前肥胖儿童足部生物力学研究很少将扁平足作为参与者的前提条件排除在外。
本研究旨在确定在肥胖儿童足部生物力学研究中，是否必须将扁平足定义为受试者筛选标准。
通过足弓指数（AI）对足型进行分类。从我们的数据库中选择了 21 名患有扁平足的肥胖儿童（OF 组）以及匹配的肥胖儿童正常足（ON 组）和正常体重儿童扁平足（NF 组）。使用 Footscan®平板系统进行赤脚行走轨迹测试。记录峰值力（PF）、峰值压力（PP）、压力-时间积分（PTI）、接触面积（CA）和 COP 数据。采用独立 t 检验和效应量比较研究组和对照组之间的数据。采用组内相关系数（ICC）测量因变量的轨迹间可靠性。
与 OF 组相比，ON 组的 PF、PP 和 PTI 呈上升趋势，而 NF 组则呈相反趋势。即使 AI 没有显著差异，OF 组中足中部区域的 CA 也明显大于 NF 组。OF 组的 COP 进展更偏向内侧，而 ON 组则更偏向外侧。但是，OF 组和 NF 组之间的 COP 参数没有差异。
本研究提供了充分的证据支持，即肥胖组前瞻性足部生物力学研究需要将扁平足作为受试者筛选标准之一，以获得更可靠的结果，而不会产生混杂效应。
