Chaos Analysis of Knee Osteoarthritis (OA) Patients' Gait

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  • AOKI Osamu
    Department of Rehabilitation, Rehabilitation Nishi-Harima hospital, Hyogo Prefectural Rehabilitation Center at Nishi-Harima Faculty of Health Science, Graduate School of Medicine, Kobe University
  • KAGAWA Shinji
    Department of Rehabilitation, The Hospital of Hyogo College of Medicine
  • KAWAMURA Shozo
    Department of Mechanical Engineering, Toyohashi University of Technology
  • HIRATA Souitiro
    Faculty of Health Science, Kobe University School of Medicine

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Other Title
  • カオス解析による変形性膝関節症患者の歩行分析
  • カオス カイセキ ニ ヨル ヘンケイセイ シツカンセツショウ カンジャ ノ ホコウ ブンセキ

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Abstract

Using three-dimensional analysis, we measured the knee joint angle in walking for gonarthrosis patients and healthy elderly people and performed chaos analysis on the knee joint angle data of 3 gait cycles. In the comparison of the patients and healthy people using the Lyapunov index, which is a chaos index, the Knee OA group showed a significantly lower value compared with healthy elderly people (healthy elderly people: 1.90 ± 0.59, knee OA group: 1.61 ± 0.40, p<0.05). In correlation analysis of the Lyanupuv index of knee OA and clinical data (time from onset; the Japanese Orthopaedic Association knee joint function evaluation, JOA score; femorotibial joint, FTA; knee joint ROM, gait speed), a significant correlation was only obtained for the JOA score (r=0.73, p<0.05). These results show that the more serious the osteoarthritis was, the smaller the Lyapunov index became, suggesting this chaos index is related to the knee joint function.<br>

Journal

  • Rigakuryoho Kagaku

    Rigakuryoho Kagaku 22 (1), 109-113, 2007

    The Society of Physical Therapy Science

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