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KMID : 1137820130340020080
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의공학회지
2013 Volume.34 No. 2 p.80 ~ p.90
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A Study on Changes in Biomechanical Characteristics of the Foot with Respect to Wedge-type Insole Thickness
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Park Tae-Hyun
Jung Tae-Gon
Hang Dong-Wook
Lee Seong-Jae
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Abstract
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Recently, functional insoles of wedge-type it is for the young to raise their height inserted between insole and heel cause foot pain and disease. Additionally, these have a problem with stability and excessively load-bearing during gait like high-heel shoes. In this study, we compared the changes in biomechanical characteristics of foot with different insole thickness then we will utilize for the development of the insole with the purpose of relieving the pain and disease. Subjects(male, n = 6) measured COP(center of pressure) and PCP(peak contact pressure) on the treadmill(140cm/s) using F-scan system and different insole thickness(0~50 mm) between sole and plantar surface during gait. Also, we computed changes of stresses at the foot using finite element model with various insole thickness during toe-off phase. COP moved anterior and medial direction and, PCP was increased at medial forefoot surface, 1st and 2nd metatarsophalangeal, (9%↑) with thicker insoles and it was show sensitive increment as the insole thickness was increased from 40 mm to 50 mm. Change of the stress at the soft-tissue of plantar surface, 1st metatarsal head represents rapid growth(36%↑). Also, lateral moments were increased over the 100% near the 1st metatarsal as the insole thickness was increased from 0 mm to 30 mm. And it is show sensitive increment as the insole thickness changed 10 mm to 20 mm. As a result, it was expected that use of excessively thick insoles might cause unwanted foot pain at the forefoot region. Therefore, insole thickness under 30 mm was selected.
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KEYWORD
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Wedge-type Insole Thickness, Plantar Pressure, Finite Element Analysis, Biomechanics
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