Ulnar neuropathy with abnormal non-localizing electrophysiology: clinical, electrophysiological and ultrasound findings

Ulnar neuropathy, the second most common mono-neuropathy, is usually due to focal nerve pathology at the elbow, with an estimated incidence of 24.7/105/year (Mondelli et al., 2005). It typically presents with paraesthesia or sensory loss in the little and ring fingers and weakness of ulnar innervated muscles. Diagnosis is usually based on clinical findings and abnormal electrophysiology. Electrodiagnostic tests can localize the lesion by demonstrating focal conduction slowing, with or without temporal dispersion and conduction block across the elbow (AAEM, 1999a), with a sensitivity varying from 38 to 89% (AAEM,1999b).

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