PNF and Movement 2021; 19(2): 233-242
https://doi.org/10.21598/JKPNFA.2021.19.2.233
Effect of Hallux Point Insole on Foot Contact Area and Pressure
Su-Kyong Lee, P.T., Ph.D.⋅Su-Hong Ahn, P.T., Ph.D.1†⋅Yong-Woon Kim2⋅Ki-Eun Yang3
Department of Physical Therapy, College of Nersing and Healthcare Sciences, Dong-Eui University
1Department of Industry-University Cooperation Foundation, Dong-Eui University
2Delta Korea
3Wizbrown
Correspondence to: Su-Hong Ahn (lkw2473@hanmail.net)
Received: July 18, 2021; Revised: August 3, 2021; Accepted: August 4, 2021; Published online: August 31, 2021.
© Korea Proprioceptive Neuromuscular Facilitation Association. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: The purpose of this study was to determine the changes in foot contact area and pressure when walking with a functional insole that emphasizes the Hallux point as compared to a general insole.
Methods: In this study, an experiment was conducted to investigate changes in plantar pressure and contact area for a functional insole that emphasized the Hallux point as compared to a general insole. A lower extremity robot was used for walking reproduction. First, the gait sequence according to the two insoles was determined through a randomized controlled trial comparison. According to the sequence procedure, the insole was attached to the shoe and then worn on the right side of the lower extremity robot for gait reproduction at a normal gait speed of 20 steps per minute. After programming the robot to walk, the experiment was carried out. The result value was determined by averaging the pressure and area data of the fore and rear foot measures after walking at 20 steps per minute.
Results: The functional insole that emphasized the hallux point significantly increased the forefoot and rearfoot contact area (p < 0.05) and significantly decreased the forefoot and rearfoot contact pressure (p < 0.05) compared to the general insole.
Conclusion: A functional insole that emphasizes the hallux point does not collapse the medial longitudinal arch during gait, increasing foot stability and reducing fatigue. Thus, this functional insole needs to be widely used clinically.
Keywords: Hallux point, Insole, Medial longitudinal arch, Abductor hallucis muscle


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