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The "Nail File Sign": A Report of Three Cases With Varied Etiologies.

Vasudeva G Iyer1, Lisa B Shields2, Yi Ping Zhang2

  • 1Clinical Neurophysiology, Neurodiagnostic Center of Louisville, Louisville, USA.

Cureus
|December 8, 2025
PubMed
Summary

The "nail file sign" helps diagnose ulnar nerve neuropathy by testing finger flexion. Its presence indicates a lesion proximal to the flexor digitorum profundus muscle, aiding localization.

Keywords:
cubital tunnel syndromeelectrodiagnostic studiesnail file signneurologyulnar nerveulnar neuropathyultrasound studies

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