AI Article Synopsis
- Ulnar nerve lesions can occur at various sites in the wrist and may affect different nerve branches, often going undetected by standard neurophysiological tests.
- Demonstrating conduction block or focal slowing in nerve conduction is key for identifying segmental demyelination.
- The short-segment incremental study (SSIS) technique is effective for diagnosing ulnar neuropathy at the wrist, as shown in three cases caused by ganglion cysts in Guyon's canal, despite being time-consuming and technically complex.
Article Abstract
Ulnar nerve lesions may occur at different sublocations 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.
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