Radiculopathy — pain, weakness, or sensory changes radiating along a nerve root distribution — is one of the most commonly claimed and most commonly contested injuries in personal injury litigation. Defense IME physicians routinely challenge radiculopathy claims by pointing out that MRI findings alone do not prove nerve dysfunction, and that subjective pain complaints are insufficient for a damages finding. Nerve conduction velocity (NCV) and electromyography (EMG) studies close this evidentiary gap by providing objective, measurable electrophysiological evidence of nerve injury.
What NCV and EMG Actually Measure
Nerve Conduction Velocity (NCV) measures the speed and amplitude of electrical signals traveling along peripheral nerves. Abnormal conduction velocity or reduced signal amplitude indicates nerve damage, demyelination, or axonal loss — all objective, quantifiable findings that can be presented at deposition and trial.
Electromyography (EMG) measures the electrical activity within muscle fibers. Abnormal spontaneous activity (fibrillation potentials and positive sharp waves) in a muscle indicates active denervation — meaning the nerve supplying that muscle has been damaged. The pattern of abnormal muscles, mapped to their nerve root supply, identifies the specific level of radiculopathy with a precision that imaging alone cannot match.
Together, NCV and EMG provide a complete electrophysiological picture of peripheral nerve function that is independent of the patient's subjective report — making it highly resistant to defense challenges.
NCV/EMG and the WCB MTG Framework
Under the NYS No-Fault Board Medical Treatment Guidelines, NCV/EMG studies are the required objective study for documenting radiculopathy before certain treatments — including epidural steroid injections — can be authorized. Unlike many diagnostic services, NCV/EMG authorization under the MTGs is governed entirely by clinical criteria, not cost thresholds.
The MTG criteria for NCV/EMG are specific: the study must document findings consistent with the level of nerve root compression identified on MRI, and the report must address dermatomal distribution, conduction velocity, amplitude, latency, and EMG needle examination findings by muscle group. A study that fails to address these parameters is both clinically incomplete and MTG non-compliant.
At MAIC, all NCV/EMG studies are performed and interpreted by board-certified electrodiagnosticians with specific experience in medico-legal documentation. Reports are structured to address MTG criteria by chapter and section citation.
When to Order NCV/EMG in a PI Case
NCV/EMG should be considered for any PI patient presenting with:
- Radiating pain from the cervical or lumbar spine into the extremities
- Numbness, tingling, or paresthesia in a dermatomal distribution
- Muscle weakness consistent with nerve root involvement
- Reduced or absent deep tendon reflexes
- MRI findings of disc herniation with foraminal narrowing or nerve root impingement
- Post-traumatic carpal tunnel or ulnar nerve entrapment
In most PI cases, NCV/EMG is ordered concurrently with or immediately following MRI, as the two studies together provide the most complete picture of neurological injury. At MAIC, same-day NCV/EMG scheduling is available for referrals with urgent litigation timelines.
Using NCV/EMG Findings at Deposition and Trial
NCV/EMG findings are among the most effective clinical data points in PI litigation because they are numerical, reproducible, and directly tied to anatomical pathology. A report documenting H-reflex latency prolongation at L5-S1 consistent with MRI-confirmed disc herniation at L4-5 is a concrete, defensible finding that directly supports a causation argument.
MAIC's treating electrodiagnosticians are available for deposition and available to provide sworn medical narrative affidavits on NCV/EMG findings. To refer a patient or discuss electrodiagnostic strategy for a specific claim, call our team at (888) 991-5290.