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What are the diagnostic tools for determining extent of injury?

There are several which look for sensory and motor changes in the affected limb. They include EMG (electromyography), which utilizes a needle electrode inserted into the muscle to measure the ability of the muscle to respond to the electrical impulse, MRI (magnetic resonance imaging) scan and possibly CT Myelogram, where contrast dye is injected into the spine and scanned to see if there is leakage from the spine or other indicators of damage.  Surgical exploration may be scheduled to physically examine the extent of injury.