How are ulnar nerve injuries classified?

Updated: Jun 08, 2018
  • Author: Charles F Guardia, III, MD; Chief Editor: Nicholas Lorenzo, MD, MHA, CPE  more...
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McGowan established the following classification system for ulnar nerve injuries [64] :

  • Grade I - Mild lesions with paresthesias in the ulnar nerve distribution and a feeling of clumsiness in the affected hand; no wasting or weakness of the intrinsic muscles

  • Grade II - Intermediate lesions with weak interosseous muscles and muscle wasting

  • Grade III - Severe lesions with paralysis of the interosseous muscles and a marked weakness of the hand

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