Cervical Radiofrequency Ablation

Medically reviewed by Joshua L. Hare, DO, Founder & Medical Director

Conditions Treated

Cervical facet arthritis, cervicogenic headache, whiplash-related neck pain and cervical spondylosis, each identified beforehand with diagnostic medial branch blocks.

Why Neck Joints Send Pain Somewhere Else

The facet joints are the paired joints at the back of the spine that let you turn and tip your head. When they become arthritic they rarely hurt only where they sit. In a pain clinic population the reported prevalence of cervical facet joint pain approaches 60%[1] of patients with neck pain, and the pain is referred in patterns specific enough that they were mapped in 194 patients who underwent dual comparative blocks.

Suboccipital, at the base of the skull

C1–2 and C2–3[1]

Posterolateral neck

C3–4[1]

Neck into the shoulder girdle

C4–5[1]

Lower neck into the upper limb girdle

C5–6 and C6–7[1]

The joint at the top of that list is the reason so many people arrive having been treated for headache rather than for a neck problem. The C2–3 facet joint is supplied by the third occipital nerve,[1] and headaches coming from that joint were once called third occipital headache for exactly that reason. Among 100 patients with persistent neck pain after a motor vehicle collision,[1] the prevalence of third occipital headache was 27% (95% CI 18% to 36%),[1] rising to 53% (95% CI 37% to 68%)[1] in those whose dominant complaint was headache rather than neck pain.

Why a Scan Cannot Settle It

Patients often arrive with an MRI or CT report listing arthritis in these joints and assume the diagnosis is made. It is not. Degenerative change in these joints is frequently present in people who have no neck pain at all. One study found a 33% prevalence of cervical facet arthritis[1] in patients scanned for pain that had nothing to do with the spine. In another cohort the overall prevalence of cervical facet joint degeneration was 45.5%.[1]

The guideline concludes that the current evidence is insufficient to assess the balance of harms and benefits[1] of imaging for diagnosing cervical facet pain, or as a predictor of whether blocks or ablation will succeed. Imaging remains useful for ruling out the things that would change the plan, such as fracture, tumor or nerve compression. It is not the test that decides whether your facet joints are the source.

The Blocks That Decide Whether Ablation Is Offered

Because no scan and no single examination finding is decisive, the joints have to answer for themselves. A diagnostic medial branch block places a small volume of local anesthetic on the nerves that supply a specific joint. If your usual pain goes quiet while that anesthetic is working, those nerves are carrying it. If it does not, they are not, and ablation would have nothing to switch off.

The block is often performed more than once. In the neck, reported false-positive rates for a single uncontrolled block range from 36% to 55%,[1] and the guideline states that the rationale for performing more than one diagnostic block is to reduce the false-positive rate and improve the success rate[1] of ablation. The guideline also names the trade-off: requiring more positive blocks would likely raise the success rate, but at the expense of withholding treatment[1] from people who might have benefited. How many blocks you are offered is therefore a judgment your physician makes with you, weighing your history, examination and imaging.

The kind of block matters as much as the number. Injecting steroid inside the joint itself is less predictive than a medial branch block[1] of how you will respond to ablation across the C2–3 through C7–T1 joints, so the medial branch block is the test used to select patients. Blocks are short injections, and they are performed without sedation,[1] including anxiolytics and opioids, because there is evidence sedation may increase the false-positive rate.

Conservative care comes first. The guideline supports a requirement for conservative management before prognostic blocks[1] in patients who have had neck pain for at least three months, and at least a six-week trial of conservative therapy, which in practice may vary from patient to patient.

How the Procedure Is Performed

You lie on your front or your side and the skin over the treatment area is numbed. A radiofrequency cannula is advanced under live X-ray to sit alongside each target nerve rather than across it. In the neck the trajectory constraints are less substantial than in the lumbar spine,[1] which lets the electrode be placed parallel or nearly parallel to the nerve. The heated zone forms along the side of the electrode, so an electrode lying against the nerve captures far more of it than one touching it end-on.

Image guidance is not optional here. Cervical joint procedures performed without it are, in the guideline's assessment, likely to produce at least as many complications and poor outcomes[1] as unguided lumbar injections. For cervical medial branch ablation specifically the recommendation is fluoroscopy rather than CT, since the additional radiation exposure from CT precludes any theoretical benefit.[1]

Before the lesion is made, a stimulation test confirms the electrode is on the intended sensory nerve and not near a motor nerve. The guideline notes that even 0.3 mL of injected fluid spreads across an area greater than the volume of a thermal lesion[1] made by an 18-gauge cannula with a 10 mm active tip. Nothing is removed and no bone is cut. The nerves are interrupted, and they regrow.

What the Evidence Shows

The trial most often cited for this procedure is a placebo-controlled randomized study in people whose neck pain began with a car crash and whose facet joints had been confirmed by double diagnostic blocks, one of them a placebo injection. Of those who went on to cervical medial branch ablation, 58% (7 of 12) had complete pain relief[1] and restored function at 27 weeks. A larger series that used dual blocks to select patients reported a 66% success rate in 104 patients,[1] again defined as complete pain relief.

The bar used in both of those figures is worth stating plainly, because it is an unusually demanding one: what was measured is complete relief, not partial improvement. Both series also selected their patients rigorously with diagnostic blocks beforehand, and stringent selection criteria[1] have been associated with high medial branch ablation success rates. That is why the diagnostic step is treated here as part of the treatment rather than as paperwork in front of it.

Safety, and What Limits a Single Session

Cervical facet interventions performed under image guidance have a good safety record, and the guideline notes that moderate to severe complications are rare in both the neck and the low back. A review of adverse events found no instances of nerve damage, spinal cord injury, infection or epidural hematoma.[1] What the neck does carry is a higher rate of one specific event: cervical procedures showed a higher risk of intravascular adverse events,[1] such as oozing or entry of the needle into a blood vessel, than thoracic or lumbar procedures. For cervical medial branch blocks the reported incidence of intravascular penetration was 20%.[1] This is the reason live imaging and contrast are used rather than landmarks alone.

Expect the treated area to be sore for a week or two as the nerves respond, and expect relief to build over the following few weeks rather than arriving the same day. Most patients are doing their usual things again inside a few days.

How much is treated in one sitting is limited deliberately, and the limits come from the guideline rather than from scheduling convenience. Although ablation on both sides and at more than two levels[1] has been described, the recommendation is to perform these at separate visits to maximize safety. Where the nerve treated for headache is the target on both sides, the guidance is that bilateral third occipital nerve ablation be performed on separate occasions after test blocks,[1] so that tolerance for bilateral denervation is established without causing debilitating ataxia. That nerve carries balance-related sensory input, and treating both sides at once can leave a patient unsteady on their feet.

Tell your physician before the appointment if you take a blood thinner, if you have an implanted cardiac device or neurostimulator, if you have any active infection, or if you might be pregnant. Each of these changes the plan, and some of them change the timing rather than ruling the procedure out.

How Often It Can Be Repeated

The medial branch nerves regenerate, which is why relief from this procedure is measured in months rather than being permanent. When the pain returns as the nerves recover, the ablation can be repeated. Based on the mean duration of benefit, the guideline recommends repeating it no more than two times a year,[1] a grade B recommendation with a moderate level of certainty.

If your relief is consistently shorter than that, the useful question is not whether to ablate more often. It is whether every painful joint was treated, or whether a second source of pain is contributing alongside the facet joints. Your physician can answer that with the same diagnostic blocks that established the diagnosis in the first place.

References

Clinical sources for this page.

1. Hurley RW, Adams MCB, Barad M, et al. Consensus practice guidelines on interventions for cervical spine (facet) joint pain from a multispecialty, international working group. Regional Anesthesia and Pain Medicine. 2022;47(1):3–59. Back to first citation ↑