Before agreeing to a cervical fusion after a crash, ask for two diagnostic medial branch blocks. If both confirm the facet joints as the pain source, radiofrequency ablation treats them. It is an outpatient procedure. It changes nothing in the spine and closes off no surgical option.
Months after a rear-end crash, the neck pain has not settled. Imaging shows degenerative change. Physical therapy has stalled. The next visit on the calendar is with a surgeon. That is when a great many injured people agree to a cervical fusion. They do it not because fusion was proven to be the answer, but because it was the only option anyone put in front of them.
There is a step that belongs before that choice. It is a test, not surgery.
What causes neck pain after a car accident?
The cervical facet joints are the small paired joints at the back of each level of the neck. They guide motion and they carry load. In whiplash, the head snaps back and then forward. These joints are among the parts most often hurt.
Studies using controlled diagnostic blocks have found the cervical facet joints involved in roughly half of chronic neck pain after a collision. Single studies run higher or lower, based on who was studied and the cutoff used. That matters because facet pain does not show up on an MRI as a clear spot. The imaging looks like ordinary degeneration. That is exactly why it is so often blamed on age instead of the crash.
All orthobiologic care: Our orthobiologics and PRP injections page lists every injury we treat with PRP, bone marrow concentrate and microfragmented fat.
What is a medial branch block, and why are two needed?
The medial branch nerves are small nerves that carry pain signals from each facet joint. Each one can be numbed on its own.
A medial branch block places a small volume of local anesthetic (numbing medicine) at those nerves. Say the pain has lasted through months of conservative care (non-surgical care). If it goes quiet for the duration of the anesthetic, the facet joint is the pain source. If nothing changes, it is not. And a great deal of needless treatment has just been avoided.
The standard practice in interventional pain care is to perform two blocks, not one, because a single positive block has a meaningful false-positive rate. Two matching responses, each with strong relief, is the standard for moving forward.
What does radiofrequency ablation do for neck pain?
If the blocks confirm the facet joints, radiofrequency ablation treats them. A probe is placed at the same medial branch nerves and heated. This interrupts their ability to send pain signals from that joint.
Here is exactly what this is and is not:
- It is an outpatient procedure, performed under local anesthetic with the patient awake, not under general anesthesia or sedation.
- It does not fuse, remove, or replace any part. Nothing in how the spine moves is changed for good.
- The nerves grow back. Relief lasts, but not forever. Reported ranges often run from several months to roughly two years. Then the procedure can be repeated.
- If it does not work, every surgical option stays open. Nothing has been ruled out.
Published studies often report around half to two-thirds of appropriately selected patients achieving at least fifty percent pain relief. Those numbers depend heavily on picking the right patients. That is the whole case for doing the diagnostic blocks first. Individual results vary.
Should you try RF ablation before a neck fusion?
Fusion is a fair operation for the right problem. It is a poor operation for facet pain, because it does not address the pain source and it changes for good how load moves through the levels next to it.
The order is simple. The smaller, reversible option, backed by a test, comes first. Doing the permanent one first, when the reversible one might have worked, is hard to defend medically. In a claim, it is also hard to defend on cost.
The cost differential between an ablation and a cervical fusion is large. It is often tenfold or more once the facility, implant, anesthesia and rehab are counted. We will not post a price here, because it depends on the number of levels, the facility and the payer. But which one costs more is not in dispute. That is one reason this order matters in a personal injury case.
How does a diagnostic block help prove the crash caused your pain?
Insurers routinely argue that long-term neck pain after a crash is degenerative. They say the imaging shows wear the patient already had, and the crash just happened at the same time.
A diagnostic medial branch block is one of the few tools that answers that argument with more than the patient’s own word. It is an objective test that can be repeated. It pins the pain to one joint at one level. A recorded, matching response to two blocks is much harder to brush off than a pain diary.
That is a records question as much as a medical one. We wrote about the bigger version of that problem in proving causation when a pre-existing condition is in play, and about the scoring systems adjusters really use in how insurance adjusters devalue injury claims.
The rule that a diagnosis must come before the needle is not just our habit. It is written into the 2025 ASIPP guideline on regenerative therapies for the lumbar spine. What that guideline requires, target by target.
Frequently asked questions
How do I know whether my neck pain is coming from the facet joints?
You cannot tell from imaging alone. That is the core problem. Facet pain often gets worse when you arch back and turn your head. It is confirmed by a diagnostic medial branch block, not by MRI. See what facet joint pain actually feels like for how this is worked up.
Is radiofrequency ablation permanent?
No. The treated nerves grow back over time and pain can return. Then the procedure can be repeated. That is a feature, not a flaw. Nothing is changed for good, and surgery is still an option. Individual results vary.
If ablation fails, have I lost the chance to have surgery?
No. Ablation rules nothing out. This is the main reason to do it first. Read more on the two options injured patients are usually offered.
My insurer says the crash did not cause this. Does a block help?
It can. A matching response to two diagnostic blocks pins the pain to one joint. It gives objective records, not just your own report. See proving causation and exacerbation.
Can whiplash cause headaches that start in the neck?
Whiplash can, and the upper neck is a frequent source. In a study of 100 people with neck pain lasting more than three months after whiplash, 27% had headaches traced by double-blind nerve blocks to the C2-3 facet joint and its nerve, the third occipital nerve; among those whose headache was the main complaint, it was 53% (Lord et al., 1994). Nothing in the history or exam confirmed the diagnosis before the blocks did. A headache that comes with confusion, memory gaps or light sensitivity is a different question, covered in the timing windows for concussion testing.
What if my neck pain after a crash runs down my arm?
Pain that travels below the elbow with tingling, numbness or a weak grip usually means a cervical nerve root is involved, not only a facet joint. Facet pain refers to the shoulder blade, the top of the shoulder and the back of the head, and rarely brings numbness. The root is checked with the exam, an MRI read against that exam, and electrodiagnostic testing, and the answer changes the treatment target, so it is settled before any block or ablation is planned. When an EMG is needed after an injury walks through that testing.
Where do I go for this evaluation?
Injury Experts, 4477 Woodson Rd, Suite 202, St. Louis, MO 63134, serving the St. Louis region across Missouri and Illinois. Call (314) 887-5866 or text (314) 886-5902. If your case involves a formal examination by the other side, read what an IME actually is first.
Key takeaways
- Roughly half of long-term neck pain after a crash comes from the facet joints, and imaging will not show it.
- Two diagnostic medial branch blocks, not one, show whether the facet joints are the pain source.
- Radiofrequency ablation is outpatient and reversible. It rules out no surgical option.
- Relief lasts, but not forever. The procedure can be repeated. Individual results vary.
- The same blocks that guide treatment also give objective evidence of cause.
Get the pain generator identified, on the record
Diagnostic blocks produce objective documentation — useful for treatment and for a claim that is being told your pain is degenerative.
Schedule an evaluation or call or text us.
Injury Experts, 4477 Woodson Rd, Suite 202, St. Louis, MO 63134 — serving the St. Louis region in Missouri and Illinois.
Sources
- Lord SM, Barnsley L, Wallis BJ, McDonald GJ, Bogduk N. Percutaneous radio-frequency neurotomy for chronic cervical zygapophyseal-joint pain. N Engl J Med. 1996;335(23):1721–1726. doi:10.1056/NEJM199612053352302 (PMID 8929263)
- Lord SM, Barnsley L, Wallis BJ, Bogduk N. Chronic cervical zygapophysial joint pain after whiplash: a placebo-controlled prevalence study. Spine. 1996;21(15):1737–1744. doi:10.1097/00007632-199608010-00005 (PMID 8855458)
- McDonald GJ, Lord SM, Bogduk N. Long-term follow-up of patients treated with cervical radiofrequency neurotomy for chronic neck pain. Neurosurgery. 1999;45(1):61–67. doi:10.1097/00006123-199907000-00015 (PMID 10414567)
This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician. It is not legal advice.
Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed August 2026.
