After my third EMG, the doctor told me the results still appeared to point toward a problem involving C5-C6 in my neck. That confused me at first.
My pain does not stay in one little spot beside my C5-C6 artificial disc. It runs through the left side of my neck, around my shoulder blade, across part of my upper back, through my shoulder, and down my arm. I also have weakness in that arm.
I kept wondering how the doctor could possibly know the problem was coming from my neck. A nerve pathway stretches from the neck through the shoulder and into the arm, so why could it not be damaged or pinched somewhere else?
The answer is that an EMG doctor does not follow one giant nerve from beginning to end. The doctor tests a pattern of muscles and nerves supplied by different branches. When several abnormal muscles share the same cervical nerve root but do not share the same peripheral nerve, the pattern can point back toward the neck.
That explanation finally helped the test make more sense to me.
The Quick Answer
An EMG can provide evidence of a cervical nerve-root problem, but it cannot directly show the nerve being pinched.
An MRI or CT scan shows the physical structures around the nerve. An EMG and nerve-conduction study evaluate how the nerve and the muscles it controls are functioning.
Doctors combine those results with:
- The locations of pain, weakness, and numbness
- Which muscles test weak during an examination
- Reflex changes
- EMG abnormalities in selected muscles
- Nerve-conduction results
- Findings on an MRI, CT scan, or X-ray
An EMG is therefore one part of the investigation. It can help localize the affected nerve root, but it does not always reveal what is physically irritating that nerve.
What an EMG Actually Tests
People often use “EMG” as the name for the entire appointment, but the evaluation usually contains two different types of testing.
Nerve-conduction study
During the nerve-conduction portion, electrodes are placed on the skin. The doctor or technician stimulates a nerve and measures how quickly and strongly the electrical signal travels.
This can help identify a problem along a peripheral nerve, such as:
- Median nerve compression at the wrist
- Ulnar nerve compression near the elbow
- Another nerve injury in the arm
- More widespread peripheral neuropathy
The American Academy of Orthopaedic Surgeons explains that stimulating a nerve at different locations can help doctors identify a particular area of abnormal nerve function.
Needle EMG
During the needle portion, a small needle electrode is inserted into selected muscles. The doctor watches and listens to the electrical activity while the muscle is relaxed and while I activate it.
The needle is not following a nerve through my body. It is checking how individual muscles respond after receiving signals from their nerves.
If a muscle has lost part of its nerve supply or has undergone changes following a nerve injury, the electrical pattern may look different.
How Several Muscles Can Point Back to One Nerve Root
This was the missing piece for me.
A cervical nerve root leaves the spine and eventually contributes fibers to multiple peripheral nerves. Those peripheral nerves then travel to different muscles.
Because of that branching anatomy, a single cervical nerve root can affect muscles that are served by completely different named nerves farther down the arm.
For example, imagine that the doctor finds abnormalities in two muscles:
- Both muscles receive substantial input from the same cervical nerve root.
- Each muscle is reached through a different peripheral nerve.
A single injury at the wrist would not normally explain abnormalities in muscles reached through two separate peripheral nerves. A problem farther upstream, before those pathways split apart, becomes more likely.
The American Academy of Physical Medicine and Rehabilitation explains that confirming cervical radiculopathy with needle EMG generally requires abnormalities in at least two muscles supplied by the same nerve root through different peripheral nerves.
That is the pattern the doctor is looking for.
It Is More Like Tracing Electrical Circuits
I think of it like electrical wiring in a house.
If only one outlet stops working, the problem may be at that outlet or somewhere along its individual wire.
If several outlets on separate branches stop working, but they all connect to the same upstream circuit, the problem may be closer to the breaker panel.
My muscles are not literally outlets, but the comparison helped me understand the logic. The doctor tests several endpoints and works backward from the pattern.
That is how an EMG may point toward C5-C6 even though my symptoms extend far beyond my neck.
Why Did the Doctor Test a Spot Near My Back?
During my latest EMG, the doctor tested from my hand and arm toward my neck. He also inserted the needle into a spot around my upper back.
That area may have involved a paraspinal or another proximal muscle. Paraspinal muscles sit close to the spine and receive nerve input relatively near the nerve roots.
Testing these muscles can provide another clue about whether the abnormality is close to the spine rather than farther down the arm.
However, paraspinal findings have limitations. An abnormality in a paraspinal muscle may support a radiculopathy diagnosis, but it does not always identify one exact cervical level by itself. There is overlap between nerve-root levels, and some paraspinal abnormalities can occur without a symptomatic radiculopathy.
That is why the doctor should not rely on one needle placement near the neck or back. The complete muscle pattern matters more.
According to the American Academy of Physical Medicine and Rehabilitation’s review of radiculopathy testing, cervical EMG screening ideally includes multiple muscles, including paraspinal muscles.
Can an EMG Tell C5 From C6?
An EMG may suggest that abnormalities fit a C5, C6, or combined C5-C6 pattern, but the borders are not perfectly clean.
Most muscles receive input from more than one one nerve root. One muscle may receive significant input from both C5 and C6 rather than belonging exclusively to one level.
Doctors therefore use several pieces of information together.
Findings that may help identify the level
The doctor considers which muscles show abnormal electrical activity, which movements are weak, and whether reflexes are reduced.
C5 and C6 commonly contribute to muscles involved in movements such as:
- Raising the arm at the shoulder
- Bending the elbow
- Rotating or stabilizing the shoulder
- Extending the wrist
The exact pattern matters more than any single movement. A person can also compensate with other muscles, making mild weakness difficult to recognize without a careful examination.
What the test cannot promise
The EMG cannot always distinguish C5 from C6 with complete certainty. Overlapping nerve supply, the timing of the injury, the severity of nerve damage, and which muscles were tested all influence the results.
The doctor may therefore use language such as “consistent with C5-C6 radiculopathy” instead of claiming that the test proves one precise point is being compressed.
Why My Shoulder Blade and Upper-Back Pain Can Still Relate to My Neck
My symptoms have never felt like simple neck pain.
A major part of the pain sits around my left shoulder blade and upper back. It also affects the shoulder and travels down the arm. That made me wonder if the nerve was being pinched near my shoulder blade instead.
The shoulder blade area contains muscles, joints, tendons, and several nerves that can produce pain. A shoulder or muscular condition can also resemble cervical radiculopathy. That broader mix of tissues is relevant when considering why ibuprofen can ease more than nerve pain.
However, pain felt around the shoulder blade does not necessarily mean the injury is located there. Irritation of a cervical nerve root can be felt elsewhere along the connected region. The broader shoulder-blade symptom pattern is explained in why cervical nerve pain can reach the shoulder blade.
I had my shoulder evaluated, and the shoulder doctor did not find a major problem that explained my symptoms. My repeated EMG findings are another reason my doctors continue looking toward the cervical area.
I have also noticed that my symptoms change depending on how I hold or support the shoulder. I explained that experience in more detail when writing about why my neck and shoulder pain becomes worse when I relax my arm.
None of these clues proves the cause alone. Together, they create a more meaningful pattern.
Why a Pinch Farther Down the Arm May Look Different
If the nerve is compressed at the wrist, elbow, shoulder area, or another point after leaving the neck, the abnormal findings often follow one particular peripheral nerve.
Carpal tunnel syndrome is a familiar example. It involves the median nerve at the wrist. Testing may show that signals slow as they cross the carpal tunnel while other nerves remain normal.
An ulnar nerve problem at the elbow may affect muscles and sensations associated with the ulnar nerve without producing the broader pattern expected from a cervical nerve root.
A cervical nerve-root problem occurs before the fibers separate into those different peripheral nerves. It can therefore affect muscles reached through multiple named nerves.
The basic distinction
Peripheral nerve problem: Abnormalities follow one named nerve after it has branched away from the neck.
Cervical nerve-root problem: Abnormalities appear across multiple muscles that share a cervical root but use different peripheral nerves.
Brachial plexus problem: Findings may involve another pattern between the cervical roots and the individual nerves of the arm.
This is why the doctor tested several locations instead of testing only the part of my arm that hurts the most.
Can the EMG Tell Whether the Nerve Is Still Being Pinched?
Not necessarily.
This distinction is extremely important in my situation.
An EMG can show evidence that nerve fibers have been injured and that affected muscles have changed. It may also provide clues about whether those changes appear active, chronic, or recovering. The meaning of those findings after surgery is explored in whether nerve changes are still recovering.
However, the test does not directly show whether something is physically pressing on the nerve today.
An abnormal EMG after surgery could potentially reflect:
- Ongoing nerve-root irritation or compression
- Lasting changes from the original injury
- Incomplete nerve recovery
- A new injury involving the same root
- Chronic changes that remain detectable after pressure was relieved
This means my third abnormal EMG does not automatically prove that my artificial disc failed or that C5-C6 is currently being crushed.
My recently published update about continuing pain after C5-C6 disc replacement explains where I am now. The replacement reportedly looks good, yet the weakness and left-sided pain continue.
The next question is whether the newest EMG reflects old damage, current irritation, or some combination of both.
Words in an EMG Report That I Want Explained
Instead of only asking whether the EMG was “good” or “bad,” I want to understand the actual wording.
Active denervation
Findings such as fibrillation potentials and positive sharp waves can indicate that muscle fibers have lost normal nerve input. In the right clinical setting, these may suggest active or relatively ongoing nerve injury.
Chronic neurogenic changes
Motor units may change as surviving nerve fibers attempt to reconnect with muscle fibers that lost their original supply. These changes can remain visible long after the initial nerve injury.
Reinnervation
Reinnervation refers to nerve fibers reconnecting with muscle fibers or neighboring surviving nerve fibers taking over some of the work. It can be a sign of the body attempting to recover, although it does not guarantee complete strength will return.
Reduced recruitment
When I contract a muscle, fewer motor units may participate than expected. This may help the doctor recognize weakness related to reduced nerve input.
These terms must be interpreted together. One word copied from an EMG report is not enough to determine whether a nerve is permanently damaged or still getting worse.
Can an EMG Be Abnormal 15 Months After Surgery?
Yes. Electrical changes caused by nerve injury can remain detectable for a long time.
That does not automatically mean the surgery was unsuccessful. It may mean that the nerve sustained an injury before surgery and has not fully recovered. It could also mean that irritation remains or that another problem is affecting the same root. The distinction between old injury, ongoing irritation, and incomplete recovery is explored in what an abnormal EMG may mean after surgery.
The American Association of Neuromuscular and Electrodiagnostic Medicine explains that electrodiagnostic testing may help localize abnormal function, characterize it, estimate its chronology, and evaluate progression or recovery.
Because I have now undergone three EMGs, comparing the reports may be more informative than reading only the newest one.
I want to know whether the same muscles were tested each time and whether the abnormalities are:
- Improving
- Remaining stable
- Appearing in additional muscles
- Showing active denervation
- Showing chronic reinnervation
Without that comparison, “it still shows C5-C6” leaves me with more questions than answers.
Can You Have Cervical Radiculopathy With a Normal EMG?
Yes. A normal EMG does not completely rule out cervical radiculopathy.
Mild radiculopathy may not damage enough motor nerve fibers to produce detectable changes. A problem involving mainly sensory fibers can also cause significant pain or numbness without creating the muscle abnormalities a needle EMG is designed to find.
Timing matters too. If testing occurs too soon after a new injury, electrical changes may not have developed in the limb muscles yet.
Published guidance from the American Academy of Physical Medicine and Rehabilitation notes that needle EMG has limited sensitivity for cervical radiculopathy and may be normal in early, mild, purely sensory, or primarily demyelinating cases.
That means the test can miss a real nerve-root problem. It also means an abnormal test must still be matched carefully with symptoms and imaging.
Why My MRI and EMG May Seem to Disagree
An MRI asks a structural question:
What do the tissues and spaces around the nerve look like?
An EMG asks a functional question:
How are the nerve and its connected muscles working?
Those are not identical questions.
An MRI may show narrowing without proving that it causes symptoms. On the other hand, an EMG may show that a nerve root has been injured even when the current MRI does not reveal a dramatic compression.
I previously wrote about the discouraging experience of having an MRI that shows nothing significant while the pain continues. The EMG does not cancel out the MRI. It provides a different kind of evidence.
My doctors must decide whether the imaging, EMG findings, weakness, pain pattern, and physical examination tell one consistent story.
Questions I Need Answered About My Third EMG
Which exact muscles were abnormal?
Knowing the names of the muscles would help me understand why the doctor connected the results to C5-C6.
Were abnormal muscles supplied by different peripheral nerves?
This is one of the most important clues separating a cervical root problem from an injury involving one peripheral nerve.
Did the paraspinal muscles show abnormalities?
Paraspinal findings could support a problem closer to the spine, although they should not be interpreted alone.
Does the report describe active or chronic changes?
I want to know whether the findings look like ongoing nerve injury, an older injury, recovery, or a mixture of these patterns.
How does this EMG compare with my first two?
A side-by-side comparison may show whether my nerve function is improving, stable, or worsening.
Could another location still be involved?
It is possible to have more than one problem. A cervical radiculopathy and a peripheral nerve compression can sometimes coexist.
Does this explain my actual weakness?
I want the doctor to connect the electrical findings to the activities I struggle with, including holding my child with my left arm for more than a few minutes.
What the EMG Told Me and What It Did Not
My third EMG gave my doctor another reason to suspect the C5-C6 nerve-root area. It helped identify a pattern of abnormal nerve and muscle function that apparently fits with the symptoms I continue having on my left side. The discussion of what persistent weakness and EMG findings may mean connects these test findings with the real-world problem of an arm that tires during use.
It did not show a photograph of the nerve being pinched.
It did not prove that my artificial disc is defective.
It did not identify the exact structure currently causing the pain.
It did not tell me whether all of my strength will return.
What it did was narrow the investigation. Instead of treating my pain as random soreness spread across my neck, shoulder blade, back, shoulder, and arm, the results suggest that several of those symptoms may be connected through the same cervical nerve-root problem.
My next planned step is a more precisely targeted injection near the suspected nerve root. If temporarily numbing that area changes my familiar pain, it may provide another piece of evidence about where the symptoms are coming from.
I will document that part of the process once I know the exact name of the injection and have actually gone through it.
Written by Daxon Weaver, who shares his real experiences with cervical disc replacement, lumbar fusion, chronic nerve pain, EMG testing, and spine surgery recovery on Spine Recover. This article describes one patient’s experience and should not replace evaluation or treatment from a qualified medical professional.
