EMG (Electromyogram)

An electromyogram (EMG) is a diagnostic test that measures the electrical activity in your muscles and the nerves that control them. In personal injury cases, an EMG helps doctors confirm nerve damage, pinpoint the source of numbness or weakness, and document injuries after an accident.

Medical terms come up often in personal injury cases, and clients frequently ask what they mean. That’s why Andrew Kryder, Esq., founding partner of our personal injury law firm, explains them in clear terms as part of our legal glossary. Here we break down what an EMG (electromyogram) is, what it diagnoses, and why it might matter for your injury claim.

What Is an EMG Test?

An EMG, short for electromyogram, is a test that records the electrical signals in your muscles. These signals originate in the brain and spinal cord, traveling through motor nerves to make muscles contract. The pattern of those signals tells a doctor how well your muscles and nerves are working together.

During the test, a doctor inserts a small, thin needle electrode into the muscle. The electrode picks up electrical activity while the muscle is at rest and while it’s active. An EMG is often paired with a nerve conduction study (NCS), which measures how fast and how well electrical signals travel through your nerve cells. Together, these tests give a clear picture of whether a problem starts in the muscle, the nerve, or both.

What Injuries Does an Electromyography (EMG) Diagnose?

An EMG evaluates muscle and nerve function to diagnose injuries—especially problems that often can’t be seen on an X-ray or computed tomography (CT) scan. Doctors commonly use an EMG to diagnose:

• Nerve damage (including pinched, compressed, or torn nerves)
• Radiculopathy (or a compressed nerve root in the spine)
• Herniated discs that press on nearby nerves
• Peripheral nerve injuries in the arms, hands, legs, or feet
• Carpal tunnel syndrome and other repetitive strain injuries
• Muscle disorders that cause weakness, cramping, or paralysis

Because an EMG measures how nerves and muscles function, it can explain symptoms like numbness, tingling, weakness, or shooting pain that other imaging tests miss.

What Accidents Might Lead to Needing an EMG?

An EMG is often ordered when a person reports lasting numbness, weakness, or pain that points to nerve involvement. These symptoms frequently follow accidents such as:

• Car and truck crashes, especially those causing whiplash or spine injuries
• Motorcycle wrecks
• Slip and fall accidents
• Construction and workplace accidents
• Repetitive strain from certain job duties

If you’ve felt persistent tingling, numbness, or muscle weakness after an accident, a doctor may order an EMG to find the source and confirm the extent of the damage.

Why an EMG Matters in a Personal Injury Case

An EMG does more than guide treatment. It creates an objective record of nerve or muscle damage that a physical exam alone can’t provide. That record helps connect your symptoms directly to the accident, which matters when you’re seeking fair compensation.

Nerve injuries can be hard to prove because they aren’t always visible. An EMG offers measurable evidence of the injury, making it harder for an insurance company to dismiss your claim.

If you’ve been injured in an accident, the personal injury lawyers at The Kryder Law Group, LLC Accident and Injury Lawyers, can review your medical records and help you understand your options. Contact us today for a free consultation.

Frequently Asked Questions

Here are questions we often hear from clients about EMGs.

What is the difference between an EMG and a nerve conduction study?

An EMG measures the electrical activity inside your muscles, while an NCS measures how quickly and effectively signals travel through your nerves. Doctors often perform the two tests together to find whether a problem starts in the muscle, the nerve, or both.

Does an EMG hurt?

An EMG usually takes from 30 to 90 minutes to complete. While most people tolerate the test well, it can cause brief discomfort—similar to a small pinch or pressure—as the thin needle electrode enters the muscle. Minor bruising may occur at needle insertion sites, and mild muscle soreness typically fades within a few hours to a couple of days. Bleeding and other complications are a rare risk, primarily for patients on blood thinners.

Can EMG results be used as evidence in my injury case?

Yes. EMG results provide objective medical evidence of nerve or muscle damage. They can help document the type and severity of your injury and link it to the accident, which is valuable when pursuing a claim.

Who pays for an EMG after an accident?

Payment can come from several sources, including auto insurance, health insurance, or a settlement. A personal injury lawyer can help you understand how your medical costs may be covered.