Cherni Yosra, Desmyttere Gauthier, Hajizadeh Maryam, Bleau Jacinte, Mercier Catherine, Begon Mickael
School of Kinesiology and Exercise Sciences, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada; Center for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Québec, Canada; Department of Rehabilitation, Laval University, Quebec City, Québec, Canada.
School of Kinesiology and Exercise Sciences, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada; Orthodynamica Center, Mathilde Hospital 2, Rouen, France.
Clin Biomech (Bristol). 2022 Feb;92:105553. doi: 10.1016/j.clinbiomech.2021.105553. Epub 2021 Dec 29.
The 3D printing technology allows to produce custom shapes and add functionalities to foot orthoses which offers better options for the treatment of flatfeet. This study aimed to assess the effect of 3D printed foot orthoses stiffness and/or a newly design posting on muscle activity, plantar pressures, and center of pressure displacement in individuals with flatfeet.
Nineteen individuals with flatfeet took part in this study. Two pairs of foot orthoses with different stiffness were designed for each participant and 3D printed. In addition, the flexible foot orthoses could feature an innovative rearfoot posting. Muscle activity, plantar pressures, and center of pressure displacement were recorded during walking.
Walking with foot orthoses did not alter muscle activity time histories. Regarding plantar pressures, the most notable changes were observed in the midfoot area, where peak pressures, mean pressures and contact area increased significantly during walking with foot orthoses. The latter was reinforced by increasing the stiffness. Concerning the center of pressure displacement, foot orthoses shifted the center of pressure forward and medially at early stance. At the end of the stance phase, a transition of the center of pressure in posterior direction was observed during the posting condition. No effect of stiffness was observed on center of pressure displacement.
The foot orthoses stiffness and the addition of posting influenced plantar pressures during walking. The foot orthoses stiffness mainly altered the plantar pressures under the midfoot area. However, posting mainly acted on peak and mean pressures under the rearfoot area.
3D打印技术能够制造定制形状并为足部矫形器增添功能，为扁平足的治疗提供了更好的选择。本研究旨在评估3D打印足部矫形器的刚度和/或一种新设计的加楔对扁平足个体肌肉活动、足底压力和压力中心位移的影响。
19名扁平足个体参与了本研究。为每位参与者设计并3D打印了两双具有不同刚度的足部矫形器。此外，柔性足部矫形器可能具有创新性的后足加楔。在行走过程中记录肌肉活动、足底压力和压力中心位移。
穿着足部矫形器行走并未改变肌肉活动的时间历程。关于足底压力，在足中部区域观察到最显著的变化，穿着足部矫形器行走时，该区域的峰值压力、平均压力和接触面积显著增加。增加刚度会强化这种效果。关于压力中心位移，足部矫形器在站立初期将压力中心向前和向内移动。在站立阶段末期，在加楔条件下观察到压力中心向后方向的转变。未观察到刚度对压力中心位移有影响。
足部矫形器的刚度和加楔会影响行走过程中的足底压力。足部矫形器的刚度主要改变了足中部区域下方的足底压力。然而，加楔主要作用于后足区域下方的峰值和平均压力。
