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Related Experiment Videos

Variations in dorsomedial hand innervation. Electrodiagnostic implications.

A R Peterson1, M J Giuliani, M McHugh

  • 1Department of Neurology, University of Pittsburgh, Pa. 15261.

Archives of Neurology
|August 1, 1992
PubMed
Summary

Abnormal dorsal ulnar nerve sensory potentials may indicate anomalous innervation, not just trauma. Radial forearm stimulation can help accurately diagnose ulnar nerve lesions by identifying these variations.

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Area of Science:

  • Neurology
  • Neurophysiology
  • Anatomy

Background:

  • Sensory potentials from the dorsal cutaneous branch of the ulnar nerve (DCUN) are used to localize ulnar nerve lesions.
  • Abnormalities are often attributed to local trauma, overlooking potential anatomical variations.

Purpose of the Study:

  • To investigate whether anomalous innervation can cause abnormal DCUN responses.
  • To determine if alternative stimulation sites can improve ulnar nerve lesion localization.

Main Methods:

  • DCUN sensory potentials were recorded in 44 patients.
  • Stimulation was performed at the standard DCUN site and a secondary site on the radial forearm.

Main Results:

  • Eleven patients showed low-amplitude DCUN responses.

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  • Four of these patients had sensory potentials with radial stimulation at the standard DCUN recording site, suggesting anomalous innervation.

    • Conclusions:

    • Abnormal DCUN responses may result from anomalous innervation rather than solely local trauma.
    • Radial forearm stimulation is recommended when DCUN responses are abnormal to prevent misdiagnosis of ulnar nerve lesions.