Radiofrequency Ablation of the Medial Branch Nerves (RFA)

Common Questions About Radiofrequency Ablation Answered

1. What Is Back Nerve Ablation (RFA)?

   Radiofrequency ablation (sometimes called radiofrequency neurotomy or rhizotomy) uses a carefully controlled electrical current to heat a small area of nerve tissue, stopping it from transmitting pain signals.

   Your doctor uses real-time imaging to guide a thin needle to the exact nerve responsible for your pain. A special probe then delivers a brief burst of radiofrequency energy that warms the tissue around the nerve, "turning off" the pain signal.

   Common areas treated with RFA include:

   • Facet joint pain in the neck, mid-back, or low-back (cervical, thoracic & lumbar facet joints)
   • Sacroiliac (SI) joints
   • Knees (for arthritis-related pain)

   Because RFA only targets sensory nerves, it does not affect your ability to move or control muscles.

2. Does Radiofrequency Ablation Hurt?

   Most patients describe the procedure as mildly uncomfortable, not painful.

   You'll receive local anesthesia to numb the skin and surrounding area. During nerve testing, you might feel a brief tingling or pressure — this helps your doctor confirm the correct placement. When the nerve is ablated, you may feel a momentary warm sensation, but it's well-tolerated by most patients.

   Afterward, the treatment site can be a little sore or bruised for a few days. Ice packs and over-the-counter pain medicine are usually all that's needed.

3. How Long Does It Take for Radiofrequency Ablation to Work?

   It's normal not to feel instant relief right after the procedure.

   Most patients begin noticing improvement within 7 to 14 days, but the full benefit may take up to three or four weeks.

   That's because RFA works by creating a small, controlled heat lesion that slowly disrupts the pain pathway. It takes time for the nerve to stop transmitting those signals completely and for surrounding tissues to calm down.

   During this period, you may experience:

   • Temporary soreness or muscle stiffness at the treatment site
   • Occasional "nerve irritation" sensations such as tingling or mild burning — these fade as healing progresses

   Gentle stretching and short walks can help maintain mobility while the nerve settles.

4. How Long Does Radiofrequency Ablation Last?

   Pain relief from RFA can last anywhere from 6 months to well over 18 months, and in some cases, it may even be permanent. Individual results vary. Over time, the targeted nerves may gradually regenerate, but they often do so slowly — and when they return, pain is often less intense than before.

   If pain does come back, RFA can be safely repeated once the nerve regrows. Many patients choose to repeat the procedure to maintain long-term relief.

5. What to Expect After Radiofrequency Ablation

   After your RFA, you'll spend a short time in recovery, then go home the same day.

   Here's what to expect in the hours and days that follow:

   Immediately after the procedure

   • You can walk and move normally, though your doctor may ask you to avoid heavy lifting or strenuous activity for 24 hours.
   • Mild soreness, swelling, or bruising near the injection site is common.

   First week

   • Use ice packs (20 minutes on, 20 minutes off) to reduce swelling.
   • Avoid soaking in hot tubs or pools for 48 hours.
   • Over-the-counter pain relief such as acetaminophen or ibuprofen is typically enough for any discomfort.

   In the following weeks

   • As the treated nerves quiet down, your pain should gradually ease.
   • Your doctor may recommend physical therapy or gentle exercises to help restore flexibility and strength.
   • Call us if you notice unusual symptoms such as persistent numbness, weakness, or fever – though these are rare.
6. How to Sleep After Radiofrequency Ablation

   Getting comfortable after RFA can take a little trial and error, especially in the first few nights.

   These tips can help:

   • Avoid lying directly on the treated area for several days.
   • Use supportive pillows to cushion your neck, back, or knees depending on the treated site.
   • Sleep on your back or side with a pillow between your knees to maintain alignment.
   • Apply an ice pack before bed to reduce tenderness and help you relax.
   • If you experience muscle tightness, light stretching before bedtime can make a big difference.

   Most patients return to normal sleep routines within a few days.

7. Can Radiofrequency Ablation Cause More Pain?

   It's possible to feel temporary increased soreness after the procedure — this is part of the healing process.

   The heat used to disable the sensory nerve can cause mild inflammation for a short period. That irritation usually subsides within a week or two and is often followed by progressive pain relief.

   Serious complications such as infection or nerve injury are extremely rare. Because your doctor uses imaging guidance and sensory/motor testing during the procedure, motor nerves (which control muscle movement) are protected.

8. How Safe and Effective Is RFA?

   Radiofrequency ablation (RFA) has been used safely for decades and continues to improve with advances in imaging and technique. In appropriately selected patients, studies have shown that approximately 60-80% experience significant pain reduction, often lasting 6-12 months or longer. Because RFA is minimally invasive, it is typically performed as an outpatient procedure with little downtime.