Reliability and validity of an on-site measurement and visualization system to measure plantar pressure and shear force in footwear for the education of diabetic patients

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  • Noguchi Hiroshi
    Department of Life Support Technology（Molten）, Graduate School of Medicine, The University of Tokyo
  • Oe Makoto
    Department of Advanced Nursing Technology, Graduate School of Medicine, The University of Tokyo
  • Takehara Kimie
    Department of Nursing Administration & Advanced Clinical Nursing, Graduate School of Medicine, The University of Tokyo
  • Mori Taketoshi
    Department of Life Support Technology（Molten）, Graduate School of Medicine, The University of Tokyo
  • Sanada Hiromi
    Department of Gerontological Nursing/Wound Care Management, Graduate School of Medicine, The University of Tokyo

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Other Title
  • 糖尿病患者の靴の教育のための靴内部の圧力・せん断力オンサイト計測・提示システムの信頼性・妥当性検証

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Abstract

<p>　Introduction: We developed a new, on-site system to measure and visualize plantar pressure and shear force inside footwear to educate diabetes sufferers in the appropriate selection of footwear to prevent callus formation leading to foot ulceration. The purpose of the present study was to assess the system's reliability and validity.<br>　Method: Measurement insoles containing sensors at the first metatarsal head were inserted into athletic footwear provided to healthy subjects, who were then instructed to walk the length of a hallway three times. Further, subjects who arrived wearing footwear with a heel length of 3cm or more were asked to walk the length of the hallway once with sensors inserted in an identical manner. The mean peak pressure and peak absolute shear force were calculated per trial. For reliability, the coefficient of variance（CV）and intraclass correlation coefficient（ICC）were calculated. For validity, values in the third trial with athletic shoes and with heeled shoes were compared by paired t-test, considering that walking with heeled shoes normally increase pressure and shear force.<br>　Result: Ten participants（eight females）were recruited. The CVs ranged from 6.8-14.1% and the ICCs ranged from 0.94-0.97. The following were the mean values when walking with athletic shoes vs. heeled shoes: left peak pressure was 400 vs. 781 kPa（p = 0.04）, right peak pressure was 476 vs. 694 kPa（p = 0.03）, left peak shear force was 16.3 vs. 31.9 N（p = 0.02）, and right peak shear force was 11.2 vs. 24.8 N（p = 0.02）.<br>　Discussion: Our system showed high reliability and validity, demonstrating its suitability for educating diabetes sufferers on-site in how to select shoe appropriate to their medical condition.</p>

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