Short segment incremental study in ulnar neuropathy at the wrist: report of three cases and review of the literature

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Short segment incremental study in ulnar neuropathy at the wrist: report of three cases and review of the literature

2010, N° 1 (Vol. 110/1) p.78-83

Pinar Yalinay Dikmen(1), A. Emre Öge(2) and Jale Yazici(2)

1Department of Neurology, Acibadem University, Faculty of Medicine, Istanbul, Turkey; 2Department of Neurology, Istanbul University, Istanbul Faculty of Medicine, Çapa, Istanbul, Turkey

Abstract:

Ulnar nerve lesions may occur at different sub-locations at wrist and may involve various branches of the nerve. Standard neurophysiological studies are generally insufficient in revealing these lesions. Demonstration of conduction block and/or focal slowing of nerve conduction is the most definitive electrodiagnostic evidence for the localization of segmental demyelination. Short-segment incremental study (SSIS) is a sensitive technique for detecting the ulnar neuropathy at the wrist (UNW). We report 3 cases of UNW caused by ganglion cysts in Guyon’s canal which were studied by using SSIS across the wrist. Even though SSIS is a time-consuming and technically demanding method, it increases the electrodiagnostic potential of detecting segmental demyelination in this location.