Electromyography in hand surgery

Abstract

Hand surgeons often are called on to interpret the electrodiagnostic report, which includes both nerve conduction studies and electromyography (EMG). The EMG examination can provide useful information as to the normal and abnormal electrophysiology of muscle and its nerve. The various potentials described, however, do not point to a specific diagnosis. Through an understanding of the methodology and principles of testing the clinician will be better suited to recognizing when the report conclusions do not match the electromyographic data, or when to request further testing in cases in which insufficient data compromises one’s ability to draw definitive conclusions. The indication for surgery still hinges on reproducible physical findings combined with the appropriate clinical symptoms rather than on a test abnormality.