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Electromyography (EMG) is an electro-diagnostic technique used to identify and characterize disorders affecting the nerve roots, peripheral nerves, neuromuscular junction and muscles.
EMG utilizes a very fine needle to record and characterize the muscles' electrical activity. An EMG is an extension of the physical exam and should be done after an initial clinical evaluation has been performed, not as a substitute for clinical evaluation. It should refine, confirm or otherwise further evaluate the working diagnosis.
An EMG can help diagnose: