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Related Experiment Videos

An experimental study on the "double crush" hypothesis.

K Nemoto, N Matsumoto, K Tazaki

    The Journal of Hand Surgery
    |July 1, 1987
    PubMed
    Summary
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    A proximal nerve compression can worsen the effects of a second, distal compression, leading to greater nerve damage. Releasing both compressions fully restored nerve function in this study.

    Area of Science:

    • Neuroscience
    • Experimental Medicine

    Background:

    • The
    • double crush
    • syndrome describes a situation where a peripheral nerve is affected by two separate injuries.
    • The specific impact of sequential compressions on peripheral nerve integrity is not fully understood.

    Purpose of the Study:

    • To investigate the electrophysiologic and histologic effects of single versus double compression on peripheral nerves.
    • To determine the impact of proximal compression on a nerve's susceptibility to distal compression.

    Main Methods:

    • Experimental compression of canine sciatic nerves using a specialized clamp (KEIO compression clamp).
    • Application of a consistent compression force (15 g, approx. 27.6 mm Hg).
    • Electrophysiologic and histologic examinations to assess nerve function and damage.

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    Main Results:

    • Single compression induced incomplete conduction block and mild axonal degeneration.
    • Double compression resulted in complete conduction block and severe axonal degeneration in 50% of cases.
    • The combined deficit from double compression exceeded the sum of individual compressions.
    • Complete removal of compression yielded good therapeutic effects; incomplete removal was less effective.

    Conclusions:

    • Proximal nerve compression significantly reduces a nerve's tolerance to subsequent distal compression.
    • The
    • double crush
    • situation can lead to more severe nerve dysfunction than predicted by summing individual lesions.
    • Complete decompression is crucial for optimal recovery from double crush injuries.