Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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A Study on Changes in Biomechanical Characteristics of the Foot with Respect to Wedge-type Insole Thickness

키높이 인솔두께에 따른 족부의 생체역학적 특성변화에 대한 연구

  • Park, T.H. (Department of Biomedical Engineering, Inje University) ;
  • Jung, T.G. (Department of Nanomedical Engineering, College of Nanoscience & Nanotechnology, Pusan National University) ;
  • Han, D.W. (Department of Nanomedical Engineering, College of Nanoscience & Nanotechnology, Pusan National University) ;
  • Lee, Sung-Jae (Department of Biomedical Engineering, Inje University)
  • 박태현 (인제대학교 의용공학과) ;
  • 정태곤 (부산대학교 나노융합기술학과) ;
  • 한동욱 (부산대학교 나노융합기술학과) ;
  • 이성재 (인제대학교 의용공학과)
  • Received : 2013.03.19
  • Accepted : 2013.05.13
  • Published : 2013.04.30
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Abstract

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, $1^{st}$ and $2^{nd}$ metatarsophalangeal, ($9%{\uparrow}$) 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, $1^{st}$ metatarsal head represents rapid growth($36%{\uparrow}$). Also, lateral moments were increased over the 100% near the $1^{st}$ 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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References

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