20 Apr Facet Injections vs. Radiofrequency Ablation: Which Treatment Is Right for Your Back Pain in Carrollton?
When you have been dealing with chronic neck or back pain, getting to the right treatment can feel like navigating a maze. You may have heard of facet injections. You may have heard of radiofrequency ablation sometimes called rhizotomy. You may have even been told that you are a candidate for one or both, without getting a clear explanation of what the difference actually is and why it matters.
This guide is designed to answer exactly that question. Understanding how these two treatments work, what they are designed to accomplish, and how providers decide which one is appropriate can help you have a more informed conversation with your pain specialist and ultimately get better results.
First, What Are Facet Joints and Why Do They Cause Pain?
The spine is made up of vertebrae stacked on top of one another. On the back side of each vertebra are small joints called facet joints, also known as zygapophyseal joints. These joints connect adjacent vertebrae and allow the spine to flex, extend, and rotate. Like any joint in the body, they are lined with cartilage, surrounded by a capsule, and supplied with nerve endings that detect movement and pain.
Facet joint pain often called facet syndrome is one of the most common causes of axial back and neck pain. It is particularly common in patients with osteoarthritis, degenerative disc disease, or a history of spinal injury. The pain is typically described as a dull, aching discomfort located on one or both sides of the spine, often worsening with extension (bending backward) or prolonged standing.
The nerves responsible for transmitting pain signals from the facet joints are called medial branch nerves. These small nerves run along the surface of the facet joints and are the target of both diagnostic and therapeutic procedures.
What Are Facet Injections?
A facet injection also called a facet block or intra-articular facet injection involves injecting a small amount of local anesthetic and corticosteroid directly into or around the facet joint. The procedure is typically performed with fluoroscopic (real-time X-ray) guidance to ensure precise needle placement.
What Facet Injections Are Designed to Do
Facet injections serve two important purposes:
Diagnostic: When a facet injection provides significant, immediate relief from pain, it confirms that the facet joint is a primary source of the patient’s symptoms. This diagnostic information is critical because it guides the decision about whether more durable treatments including radiofrequency ablation are appropriate.
Therapeutic: The corticosteroid component of the injection can reduce inflammation within the joint capsule, providing pain relief that may last weeks to several months for some patients.
What to Expect From a Facet Injection
The procedure itself takes approximately 15 to 30 minutes and is typically performed on an outpatient basis. Patients may experience mild soreness at the injection site for one to two days following the procedure. Relief, if it occurs, may begin within a few days as the anti-inflammatory medication takes effect.
It is important to understand that facet injections are not designed to be a permanent solution. For many patients, the relief is meaningful but temporary and that is not a failure of the procedure. It is useful diagnostic and short-term therapeutic information that helps guide the next step.
Who Is a Good Candidate for Facet Injections?
Facet injections are typically considered for patients who:
- Have axial neck or back pain (pain located at the spine rather than radiating down the arm or leg)
- Have not responded adequately to conservative care such as physical therapy or anti-inflammatory medications
- Have imaging or clinical findings consistent with facet joint degeneration or arthritis
- Are being evaluated to confirm whether the facet joint is the primary pain generator before proceeding to more durable treatment
What Is Radiofrequency Ablation (Rhizotomy)?
Radiofrequency ablation abbreviated as RFA and sometimes called rhizotomy or neurotomy is a procedure that uses thermal energy delivered through a specialized needle to disrupt the medial branch nerves that carry pain signals from the facet joints to the brain. By interrupting this nerve pathway, RFA can provide longer-lasting relief than a standard injection.
How the Procedure Works
Under fluoroscopic guidance, the physician positions a radiofrequency needle alongside the medial branch nerves supplying the affected facet joints. Once the needle is in the correct position, a radiofrequency current is applied, generating controlled heat that disrupts the nerve’s ability to transmit pain signals. The procedure typically takes 30 to 60 minutes depending on how many levels are being treated.
How Long Does Relief Last?
Most patients who respond to RFA experience meaningful pain reduction for six months to two years. Because the medial branch nerves do have the capacity to regenerate over time, some patients experience a gradual return of symptoms after this window but the procedure can be repeated if symptoms return and the patient remains an appropriate candidate.
Who Is a Good Candidate for Radiofrequency Ablation?
The key requirement for RFA candidacy is a positive response to a diagnostic medial branch block. Most pain specialists require that a patient experience at least 50% to 80% pain reduction following a diagnostic block before proceeding to RFA. Ideal candidates for RFA typically:
- Have confirmed facet-mediated pain through a positive diagnostic block
- Have axial spine pain that has not been adequately controlled with injections alone
- Are looking for a longer-duration solution before considering more invasive options
- Do not have pain primarily caused by disc herniation or nerve root compression
Key Differences at a Glance
Mechanism: Facet injections reduce inflammation with medication. Radiofrequency ablation disrupts the nerve pathway that transmits pain.
Duration of relief: Facet injections typically provide weeks to months of relief. RFA typically provides six months to two years of relief.
Primary purpose: Facet injections are both diagnostic and therapeutic. RFA is primarily therapeutic and requires prior confirmation of the pain source.
Procedure complexity: Facet injections are simpler and faster. RFA is more involved but still minimally invasive and performed outpatient.
Repeatability: Both procedures can be repeated. RFA can be performed again if the medial branch nerves regenerate and symptoms return.
The Role of Diagnostic Precision
One of the most important things to understand about both of these procedures is that they are part of a diagnostic and treatment sequence, not interchangeable options. Facet injections often come first both to provide initial relief and to confirm the pain source. If a patient responds well to a diagnostic medial branch block, that confirmation opens the door to RFA as a more durable next step.
A thorough evaluation including a detailed history, physical examination, and appropriately sequenced diagnostic injections is what makes the difference between a treatment that works and one that does not.
Getting the Right Evaluation in Carrollton and Denton
At Principal Spine & Pain Consultants in Carrollton and Denton, Dr. Paul Kurian uses a thorough diagnostic process to identify the true source of each patient’s pain before recommending any procedure. The goal is not simply to perform a procedure it is to find the right procedure for the right patient at the right time.
If you are ready to get clearer answers about your back or neck pain, contact our office to schedule a consultation.
This article is intended for educational purposes only and does not constitute medical advice. Please consult a qualified healthcare provider for diagnosis and treatment recommendations specific to your condition.