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Related Experiment Videos

Digital vibrogram: a new diagnostic tool for sensory testing in compression neuropathy.

G Lundborg, A K Lie-Stenström, C Sollerman

    The Journal of Hand Surgery
    |September 1, 1986
    PubMed
    Summary

    The digital vibrogram effectively detects carpal tunnel syndrome (CTS) by assessing hand vibrotactile sensibility. This method identifies abnormalities earlier than traditional tests, aiding in early diagnosis.

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    Area of Science:

    • Neurology
    • Biomedical Engineering
    • Sensory Physiology

    Background:

    • Carpal tunnel syndrome (CTS) is a common condition affecting hand function.
    • Early diagnosis of CTS is crucial for effective management and preventing nerve damage.
    • Current diagnostic methods like two-point discrimination (2PD) and neurophysiologic tests have limitations in early detection.

    Purpose of the Study:

    • To evaluate the utility of a modified Békésy audiometer for assessing vibrotactile sensibility of the hand.
    • To determine if the "digital vibrogram" can serve as an early diagnostic tool for carpal tunnel syndrome (CTS).

    Main Methods:

    • A Békésy audiometer was adapted to measure vibrotactile thresholds at frequencies from 8 to 500 Hz.
    • Digital vibrograms were analyzed in control subjects and patients diagnosed with CTS.

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  • Results were compared with two-point discrimination (2PD) and neurophysiologic test findings.

    • Main Results:

    • Digital vibrograms exhibited a characteristic shape in controls, differing significantly in CTS patients.
    • Abnormalities in digital vibrograms often preceded or paralleled neurophysiologic test changes and appeared before 2PD deficits.
    • In hands with normal 2PD, 86 out of 113 showed abnormal digital vibrograms; in hands with abnormal 2PD, 16 out of 19 were abnormal.
    • Even in hands with normal neurophysiologic findings, 14 out of 26 showed abnormal digital vibrograms.

    Conclusions:

    • The digital vibrogram is a sensitive indicator of vibrotactile sensory changes in the hand.
    • This technique shows promise as a valuable tool for the early diagnosis of carpal tunnel syndrome (CTS).
    • Digital vibrometry offers advantages over traditional tests for detecting CTS at earlier stages.