Changes in Motor Unit Activity Associated with Early Recovery of Muscle Strength after Knee Arthroplasty

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  • YAMADA Eiji
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • MORITA Shin
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • TANAKA Syouichi
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • UCHIDA Shigehiro
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • ITOH Yasuhiro
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • FUJIOKA Syuuji
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • BANDOU Masaki
    Department of Rehabilitation, Faculty of Medicine, Kagawa University Hospital
  • TANAKA Satoshi
    Department of Physical Therapy, Prefectural University of Hiroshima, Faculty of Health and Welfare
  • MASHIBA Tasuku
    Department of Orthopedic Surgery, Faculty of Medicine, Kagawa University
  • CHIKAMI Kenichirou
    Department of Orthopedic Surgery, Faculty of Medicine, Kagawa University
  • ARIMA Nobuo
    Department of Orthopedic Surgery, Faculty of Medicine, Kagawa University
  • YAMAMOTO Tetsuji
    Department of Orthopedic Surgery, Faculty of Medicine, Kagawa University

Bibliographic Information

Other Title
  • 膝関節術後早期の筋力回復に伴う運動単位の活動様式の変化
  • シツカンセツ ジュツゴ ソウキ ノ キンリョク カイフク ニ トモナウ ウンドウ タンイ ノ カツドウ ヨウシキ ノ ヘンカ

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Abstract

[Purpose] The purpose of this study was to investigate changes in motor unit activity associated with early recovery of muscle strength after knee arthroplasty. [Subjects] The subjects were eleven patients who received unicompartmental knee arthroplasty. [Methods] The maximum strength of isometric knee extension and surface electromyographic activity of the right vastus lateralis were measured before and after the operation and until discharge. Average integrated electromyographic activity at maximum isometric knee extension and mean power frequency calculated by fast Fourier transform were normalized by the values at five days after the operation. [Results ]The strength of maximum isometric knee extension decreased immediately after the operation and then gradually recovered. Mean power frequency decreased significantly after the operation. [Conclusion] The results suggest that synchronization is an important factor for recovery of the strength of isometric knee extension in the early postoperative period.<br>

Journal

  • Rigakuryoho Kagaku

    Rigakuryoho Kagaku 25 (3), 317-321, 2010

    The Society of Physical Therapy Science

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