An EMG test is used to evaluate the electrical activity of a nerve root. It is often recommended for patients with back pain, neck pain, leg pain and arm pain.
Over time, pressure on a nerve root will cause an attached muscle to spontaneously contract. This will also slow the electrical conduction along the nerve root. As a result, the EMG test can confirm nerve injury, assist the doctor in determining the exact location of the injury and ensure that no other nerves are damaged.