Proving Radiculopathy: A Playbook for Negative MRI Cases

Hey guys, and welcome back to the Lawyers NP. I'm Linda Acker, your very own nurse practitioner and legal nurse consultant. And I'm so glad you're here today.

This week is a little different. We're not gonna dive in on a new topic. Instead, we're zooming all the way out and pulling together everything we've covered in our three-part cervical spine series. This show is for informational purposes only and is not medical or legal advice. See our show notes for the full professional disclosure.

Okay. Let's get into it. Over the last few weeks, we walked through three of the most common evidentiary problems that come up in cervical spine cases. Each episode stood on its own, but really, the three of them are one story. A story about how the cervical spine actually breaks down after a collision. Why the imaging often doesn't show at all, and where the proof of injury is hiding in your client's chart.

If you listen to all three episodes, this recap is going to feel like the moment somebody hands you the table of contents after you've finished the book. Suddenly, the structure just pops. If you only caught one or two episodes, this is your nudge to go back and listen to the rest, because they really do build on each other.

Either way, by the end of these 15 minutes, you'll have the full arc, and you'll have a couple of new things to look for the next time you open a cervical spine chart. We started the series with the basics, because honestly, you cannot read a cervical spine chart if you don't have a working map of the cervical spine itself.

So in episode one, we walked through the anatomy, the seven cervical vertebrae, the facet joints that let your neck rotate and flex and extend. The discs between the vertebrae that act as a shock absorber, and the eight cervical nerves that exit the spinal column and run all the way down through the shoulders, the arms, and the hands. And here's the thing I want you to remember from that episode.

The eight cervical nerves are not interchangeable. C5 runs the deltoid and the bicep. C6 runs the wrist and the bicep. C7 runs the tricep and the middle finger. C8 runs the small muscles of the hand and gives you sensation on the pinky side. So when your client says, "My pinky has been numb since the accident," that is not a vague complaint. That is a C8 distribution complaint, and that is the kind of detail that turns a soft tissue case into a high value case.

We also walked through Mary, our 56-year-old client. Mary was fully stopped at a red light when a work truck rear-ended her at 20 to 25 miles an hour. She didn't go to the hospital that day. She felt shaken up, but mostly okay. She took some Tylenol, put on a warm pack, went to bed, and then the next morning, she woke up with a stiff neck, a dull headache at the base of her skull, and heaviness in her right shoulder.

Two days later, she went to urgent care where they read the x-rays themselves, called it whiplash, gave her naproxen and Flexeril and sent her home. We talked about why every single piece of that visit matters in your chart review. We talked about how the X-ray was read in the office and not by a radiologist, so you really need to track down the radiologist's final read if you don't have it.

The medications she was prescribed are clues. Naproxen is conservative therapy, but if you see prednisone in the chart, that's a doctor's way of saying the inflammation is out of control. If you see gabapentin in the chart with no diagnosis of radiculopathy attached, that diagnosis probably just got missed. The medications are objective corroboration of how serious the doctors think the case is.

And then we closed episode one with my love letter to physical therapy and occupational therapy notes. PT and OT are with your client two to four times a week for an hour at a time. They notice acute changes. They document goals of care. They flag when treatment stalls. If you're skipping those notes because there are a lot of them, change your practice. Get elbow deep in those charts. The case really lives there. And if you don't have the time to get in those charts, hire someone who can, like a legal nurse consultant. Okay.

Onto episode two. We took on the defense playbook Every single one of you has heard it. The property damage was minimal. The speed was under 25 miles per hour. The defense brings in a biomechanist who testifies that jumping off a step generates more force than the collision did, so an injury this serious just isn't possible. And here's what I told you in episode two. The physics isn't wrong. In a young, healthy person, an impact under 25 miles per hour usually does not generate enough force to mechanically extrude a disc. So you stop arguing about that. You start arguing about the biology.

Because the biology is as clear as day. Each disc has three parts. The annulus fibrosis is the dense outer wall. That's the containment vessel. The cartilaginous endplates sit on the top and the bottom and bring nutrients in. And the nucleus pulposus is the gelatinous center. Mostly water and proteoglycans that gives the disc its shock absorbing power.

We talked about how much pressure those discs take on every single day, and how standing upright generates about just 72.5 PSIs of pressure on your discs. That's just about double the pressure in your car tires. Bending forward at the waist, about 160 PSI. Lifting 20 kilograms off the floor around 330 PSI. So these discs are under a serious amount of mechanical load all day, every day. We talked about what happens when the annulus fibrosis tears, even just a little.

The nucleus pulposus is no longer contained, and that gel leaks out onto the surrounding tissue, including very often, the spinal nerve roots sitting right next to it. And the body, your body treats that leaked material like a foreign invader. It releases cytokines to recruit immune cells. Macrophages show up to clean up the spill, and in that process, they release more inflammatory mediators. The local pH drops from a normal 7.2, think baking soda, to about 5.2, which is close to tomato juice. And that acidic inflamed environment chemically burns the adjacent nerve root. That is your client's pain.

So when you prepare your expert witness, don't ask them to prove the car was hit hard. Ask them to prove that the inflammatory markers in your client's clinical history are consistent with chemical nerve irritation. The collision didn't have to break the disc. The collision just had to be the catalyst that started the cascade. And as I said, at the end of that episode, physics measures the metal.

Biology measures the misery. Now, moving on to episode three, that was the episode that tied it all together for us. Because once you understand the anatomy, you really understand the biochemistry. So the next question is, how do you actually prove radiculopathy when the MRI is negative? Radiculopathy Is, by definition, the irritation or compression of a spinal nerve root. It produces pain, numbness, tingling, weakness, and over time, muscle wasting.

And it can be caused by either direct mechanical compression, which is what shows up on an MRI as a herniated disc pressing on the nerve or by chemical irritation, that's invisible on imaging. When you have a negative MRI and a client who's clearly still hurting, you go to three other places for proof. You go to the history, you go to the physical exam, and you go to electrodiagnostic studies. That's the EMG and nerve conduction studies we discussed.

A good history documents onset of symptoms, aggravating factors, alleviating factors, quality of pain, and a pain rating scale that's used consistently over time. A good physical exam includes range of motion, palpation, deep tendon reflexes, dermatomal sensory testing, manual muscle testing, and the provocative maneuvers like Spurling's test and cervical distraction test.

And the one thing I almost never see in a physical exam that I really want you to look for is bilateral limb circumference measurements. If a provider measures the circumference of your client's bicep at the first visit, and then again, every six to eight weeks, you can map out muscle wasting on the affected side. And muscle wasting is objective.

Your client cannot fake the loss of muscle mass. That is gold. And then we worked through Bill, our 42-year-old right-hand dominant software engineer. Bill was rear-ended 12 months before he showed up at his current doctor's office. He'd bounced from provider to provider because he kept moving for work.

He had an MRI six months ago and came back negative, and he'd basically given up on treatment because nobody seemed to believe him. But his current doctor did a thorough physical, positive Spurling, positive cervical distraction, abnormal deep tendon reflexes, and even documented muscle atrophy in the right arm.

That is objective evidence of chronic radiculopathy with a negative MRI. the four questions you'll get every single time on a case like this.

Can you really prove radiculopathy with a negative MRI? Yes. Clinical exam plus history plus electrodiagnostics.

Doesn't a two-week delay in radicular symptoms suggest an intervening cause? No. Secondary inflammation can take days to weeks to mature.

Doesn't a successful epidural injection prove the injury healed? No. The injection treats inflammation and does not repair the structural defect.

And lastly, doesn't everyone over 40 have degenerative disc disease anyway? Yes. And most of them are asymptomatic.

The accident is the catalyst that pushed your client's already sensitized disc over the edge. So here's the full story of the cervical spine series in a paragraph. A low impact collision does not have to break a disc to seriously injure your client.

The collision can simply be the catalyst that creates a small annular tear. The nucleus pulposus leaks, the body mounts an inflammatory response. The local pH shifts towards acidic. The adjacent nerve root is chemically burned. Your client develops radicular symptoms, pain, numbness, weakness that radiate along a specific dermatomal distribution.

The MRI is negative because there's no mechanical compression to see. But the history, the physical exam, the electrodiagnostic studies, and the bilateral limb circumference measurements all point in the same direction. And the medications in the chart corroborate the severity. That is your case.

📍 That's the cervical spine series all in one place. A complete clinical playbook for the next time a low impact rear-ender lands on your desk.

If you found this series useful, the kindest thing you can do is share it with one other attorney who handles personal injury work.

That's how we get the word out. Thank you so much for spending the last few weeks with me on this series. This is my favorite kind of work, translating the medicine so you can do what you do best,  which is fight for your clients.

Until next time, stay medical legal ready.

The information provided in this podcast, and any associated materials—including our e-books and templates—is for educational and informational purposes only.

While we strive to provide the most accurate and current data available at the time of release, science and law are constantly evolving.

This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment, nor does it constitute legal advice or the establishment of an expert-witness relationship.

For Attorneys: Always consult with a qualified medical expert regarding the specific facts of your case. For the General Public: Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

Never disregard professional medical advice or delay in seeking it because of something you have heard on this show.

Reliance on any information provided by Linda Acker, FNP, or Clear Advantage LNC is solely at your own risk.