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[Clinical studies on chaddock reflex]

K Tashiro

    [Hokkaido Igaku Zasshi] the Hokkaido Journal of Medical Science
    |November 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    The Chaddock reflex is more sensitive and accurate than the Babinski reflex in neurological examinations. Electromyography confirms the Chaddock reflex

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    Area of Science:

    • Neurology
    • Neurophysiology
    • Clinical Electromyography

    Context:

    • Pathological reflexes are crucial indicators in neurological assessments.
    • The Chaddock and Babinski reflexes are commonly used to evaluate upper motor neuron lesions.
    • Previous studies suggest variations in sensitivity and clinical utility between these reflexes.

    Purpose:

    • To compare the sensitivity and diagnostic accuracy of the Chaddock reflex versus the Babinski reflex.
    • To objectively determine the receptive field and optimal stimulation sites for the Chaddock reflex using electromyography.
    • To investigate the neurophysiological basis for the observed differences in reflex sensitivity.

    Summary:

    • Clinical evaluation of 100 neurological cases showed the Chaddock reflex (97.1% positive rate) to be more sensitive than the Babinski reflex (80.3% positive rate).

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  • Electromyographic (EMG) studies in 13 cases using extensor hallucis longus (EHL) and flexor hallucis brevis (FHB) demonstrated that Chaddock's stimulation area, within the sural nerve distribution, elicited significantly more sensitive and earlier responses in EHL compared to Babinski's area.
  • These findings indicate the Chaddock reflex is a distinct, more sensitive, and accurate pathological reflex with a receptive field primarily in the sural nerve distribution.

    • Impact:

    • The Chaddock reflex should be considered a more sensitive and reliable indicator in neurological examinations for detecting upper motor neuron dysfunction.
    • Objective EMG data supports the clinical observation of the Chaddock reflex's superior sensitivity, potentially refining diagnostic protocols.
    • Understanding the specific receptive field (sural nerve) of the Chaddock reflex enhances its clinical application and interpretation.