Contribution of Lumbrical Muscle Activity to the Paradoxical Extension Phenomenon Induced by Injuries to the Finger Flexor Tendons

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著者

    • KAJIWARA Toshio
    • Department of Rehabilitation Medicine, School of Medicine, Fujita Health University
    • ONOGI Keiko
    • Department of Rehabilitation Medicine, School of Medicine, Fujita Health University
    • SHIMIZU Hiroyuki
    • Department of Rehabilitation Medicine, School of Medicine, Fujita Health University

抄録

The "Extensor habitus" phenomenon occurs in finger flexor tendon injuries and consists of a paradoxical extension of the interphalangeal joints after an attempt to flex the finger. The mechanism of extension is considered to be a contraction of the flexor digitorum profundus that is then transmitted <i>via</i> the lumbrical muscle structure to the extensor expansion. Using electromyography, we recorded the lumbrical muscle activity during the paradoxical extension phenomenon to determine whether the lumbrical muscle contributed to this event. Two patterns of electromyographical activity of the lumbrical muscle were observed. Group I (6 fingers) displayed electrical activities in the lumbrical muscle during flexion tasks, while group II (12 fingers) did not. In group I, the lesions were mainly located in zone V, and the response to range of motion exercises was satisfactory. In group II, nearly all of the lesion were located in zone II, and half of the cases required additional surgical interventions. Group II appeared to exhibit the "Extensor habitus" phenomenon, while group I exhibited an "Extensor habitus-like phenomenon." To distinguish between these two phenomena, an electromyographical examination of the lumbrical muscle must be performed.

収録刊行物

  • Keio journal of medicine

    Keio journal of medicine 48(4), 175-178, 1999-12-01

    The Keio Journal of Medicine

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各種コード

  • NII論文ID(NAID)
    10013620391
  • NII書誌ID(NCID)
    AA00710216
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00229717
  • データ提供元
    CJP書誌  J-STAGE 
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