Back and leg pain with normal emg5/17/2023 However, if only pain and/or sensory changes develop from nerve compression without motor involvement, the EMG/NCV is less useful as it will probably not identify this disorder.ĮMG and NCV testing will not be helpful to diagnose problems that originate from the central nervous system (CNS). Radiculopathy (compression of the nerve root in the spine), neuropathy (dysfunction of the nerve in the arm or leg), some forms of multiple sclerosis and some other nerve diseases can be demonstrated by the EMG/NCV. There are some basic problems that can be easily diagnosed and some disorders that these tests cannot easily distinguish apart. EMGs and NCVs are electrical tests to help diagnose problems that can occur in the peripheral nervous system.
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