Electrodiagnostic Corner

HSS Journal

, Volume 5, Issue 1, pp 73-77

First online:

T1 Radiculopathy: Electrodiagnostic Evaluation

  • Jeffrey RadeckiAffiliated withDepartment of Physiatry, Hospital for Special Surgery
  • , Joseph H. FeinbergAffiliated withDepartment of Physiatry, Hospital for Special Surgery Email author 
  • , Zachary R. ZimmerAffiliated withDepartment of Physiatry, Hospital for Special Surgery

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Electromyography (EMG) studies are useful in the anatomical localization of nerve injuries and, in most cases, isolating lesions to a single nerve root level. Their utility is important in identifying specific nerve-root-level injuries where surgical or interventional procedures may be warranted. In this case report, an individual presented with right upper extremity radicular symptoms consistent with a clinical diagnosis of cervical radiculopathy. EMG studies revealed that the lesion could be more specifically isolated to the T1 nerve root and, furthermore, provided evidence that the abductor pollicis brevis receives predominantly T1 innervation.


electromyography EMG electrodiagnostics T1 radiculopathy abductor pollicis brevis (APB) T1-T2 disc herniation