Genicular Nerve Ablation in Hoffman Estates: A Pain Doctor Complete Guide to Knee Osteoarthritis and Post-Replacement Pain

Last updated: May 2026. Author: Keith W. Schmidt, MD, Triple Board-Certified Interventional Pain Management Physician, Medical Director Neuroscience Institute Pain Program at Ascension Saint Alexius, Chair of the ASPN Healthy Longevity & Age-Related Pain Committee.

If you have chronic knee pain that has not responded to physical therapy, NSAIDs, cortisone injections, or hyaluronic acid (gel) shots, and your orthopedist has either recommended a knee replacement or said you are not yet a candidate for one, there is a procedure most patients have not heard of: genicular nerve ablation. It is a minimally invasive radiofrequency ablation of the small nerves around your knee that carry pain signals. It is outpatient, takes about an hour, requires no general anesthesia, and is increasingly covered by Medicare and commercial insurers. I perform genicular ablation regularly in my Hoffman Estates practice. This is the patient guide I wish every chronic knee pain patient had before their next consult.

Table of Contents

• What is genicular nerve ablation
• The genicular nerve anatomy: what we are actually targeting
• The two-step workflow: diagnostic block first, then RFA
• Who is a candidate
• What the evidence actually shows
• Medicare and insurance coverage in Illinois
• What the day-of looks like
• Recovery timeline
• Alternatives and what to do if it does not work
• Risks and complications
• Post-knee-replacement pain: a special case
• Frequently asked questions
• References

What is genicular nerve ablation

The genicular nerves are small sensory nerves that wrap around the knee joint and carry pain signals from the joint structures back to the brain. They do not control any movement; they only carry sensation. By using radiofrequency energy to heat-coagulate these specific nerves, we silence the pain signal at its source while preserving knee function.

Genicular ablation does not treat the underlying arthritis or cartilage loss. It treats the pain. The cartilage is still where it is. The bone is still where it is. What changes is whether you feel pain when you walk, climb stairs, or kneel.

The genicular nerve anatomy

Three main genicular nerves carry the bulk of knee pain signal:

• Superior medial genicular nerve (top inside)
• Superior lateral genicular nerve (top outside)
• Inferior medial genicular nerve (bottom inside)

I target all three on each side under fluoroscopic guidance. Some clinicians also target the inferior lateral genicular nerve and the recurrent fibular nerve, but the evidence is weaker and the risk of motor nerve injury is higher with those, so I generally stick to the standard three.

The two-step workflow: diagnostic block, then RFA

Genicular ablation is a two-visit procedure:

Visit 1 – Diagnostic genicular nerve block. I inject a small amount of local anesthetic at each of the three genicular nerve targets under fluoroscopy. The whole procedure takes 15 to 20 minutes. You then walk for the next several hours and track your pain on a diary I provide. The block lasts a few hours.

The 50 percent rule: if you got at least 50 percent pain reduction during the active block, you are very likely to get sustained pain reduction from the actual radiofrequency ablation. If the block did not give you adequate relief, the RFA is unlikely to either, and we save you the procedure and look at other options.

Visit 2 – Radiofrequency ablation. Typically 1 to 4 weeks after a successful diagnostic block. Same target nerves, but instead of injecting local anesthetic, I place RFA needles, confirm position with sensory and motor testing (the patient is awake enough to feel the test stimulation), and then run radiofrequency current to heat-coagulate each nerve at 80 degrees Celsius for 90 seconds per nerve. Total procedure time about 45 to 60 minutes.

You walk out the same day. Most patients notice meaningful pain reduction within 1 to 4 weeks, with maximum benefit at 4 to 8 weeks.

Who is a candidate for genicular ablation

The right candidate has all of these:

1. Chronic knee pain for at least 6 months that has not responded adequately to conservative care.
2. Documented knee osteoarthritis on imaging (X-ray, MRI). For post-knee-replacement pain, structural imaging may not show classic OA but the prosthesis serves as the diagnostic anchor.
3. Failed conservative care: physical therapy, NSAIDs, weight management if relevant, at least one cortisone injection, and (for many insurance plans) at least one hyaluronic acid injection series.
4. Either declined knee replacement, deferred it, or not yet a surgical candidate. Or you are post-knee-replacement with persistent pain.
5. Successful diagnostic block (50 percent or more pain reduction during the active anesthetic).

Who is NOT a great candidate

• Pain not localized to the knee (radiating low back pain confused for knee pain).
• Severe knee instability that needs surgical correction.
• Active knee infection.
• Skin infection at the procedure site.
• Bleeding disorder or anticoagulation that cannot be paused.

What the evidence actually shows

The evidence base has grown substantially over the last decade.

Choi et al., 2011: the first randomized controlled trial. 38 patients, double-blind, sham-controlled. The RFA group had 50 percent or greater pain reduction in 59 percent of patients at 12 weeks vs 14 percent in the sham group. WOMAC functional scores improved similarly.

Davis et al., 2018 (the GENESIS trial): RFA vs intra-articular cortisone, 151 patients. RFA group had significantly better pain reduction and function at 6 months and 12 months.

Realistic expectations: 60 to 80 percent of patients with a successful diagnostic block get at least 50 percent pain reduction at 12 months. Benefit typically lasts 9 to 18 months. The nerves do regenerate over time, so repeat ablation is sometimes needed.

Medicare and insurance coverage in Illinois

Medicare covers genicular RFA under most LCDs (Local Coverage Determinations) for qualifying patients. Documentation typically required:

• X-ray or MRI showing knee osteoarthritis.
• Documentation of at least 3 months of failed conservative care.
• Documentation of at least one prior intra-articular cortisone injection (and often a hyaluronic acid series).
• Successful diagnostic genicular block with at least 50 percent pain reduction.
• Functional status documentation (WOMAC or similar).

Commercial insurers in Illinois (Blue Cross Blue Shield, Aetna, UnitedHealthcare, Humana, Cigna) generally cover with prior authorization. Coverage variability exists; my team verifies for each patient.

Typical timeline from successful diagnostic block to scheduled RFA: 1 to 4 weeks.

What the day-of looks like

Diagnostic block day. Arrive 30 minutes before. Brief positioning on the procedure table, local anesthetic at the entry sites, and three small injections under fluoroscopy. Total in-room time: 15 to 20 minutes. You leave immediately and start tracking your pain diary for the next 4 to 6 hours.

RFA day. Arrive 1 hour before. IV started, vitals, brief conversation. The procedure is done under conscious sedation (most patients) or just local anesthetic (some patients prefer this). Three RFA needles placed under fluoroscopy, sensory and motor testing to confirm safe position, then 90 seconds of RFA per nerve. Total in-room time: 45 to 60 minutes. Recovery in our suite for 30 minutes. You walk out and go home.

Recovery timeline

• Day of RFA: Light walking is fine. Avoid strenuous activity. No driving the day of the procedure.
• Days 1 to 7: Some local soreness at the entry sites, sometimes a deep ache in the knee for the first week (a known and expected reaction to nerve coagulation). Tylenol works well; NSAIDs if not on blood thinners.
• Weeks 1 to 4: Gradual pain reduction starts. Most patients notice meaningful improvement by week 2 to 3.
• Weeks 4 to 8: Maximum benefit emerges. This is when most patients notice they can climb stairs, walk longer, or sleep without knee pain.
• Months 9 to 18: Sustained benefit. Some patients begin to notice pain returning around 12 months as nerves regenerate.
• If pain returns: repeat genicular RFA. Insurance generally covers repeat procedures with documented prior response.

Alternatives and what to do if it does not work

If the diagnostic block did not give you adequate relief OR the RFA itself did not produce sustained benefit, options include:

• Repeat diagnostic block at different targets, including the inferior lateral genicular nerve, recurrent fibular nerve, or a posterior knee block.
• Cooled radiofrequency ablation: a slightly different RFA technology (cooled vs traditional) that creates a larger lesion. Some patients respond to cooled RFA after non-cooled RFA failed.
• Intra-articular options: hyaluronic acid (gel) injections, PRP, or repeat cortisone (limited).
• Knee replacement: if appropriate. Genicular RFA is a bridge or alternative for patients who have declined or deferred surgery; not a replacement for surgery if surgery is clearly indicated.
• Peripheral nerve stimulation (PNS): for refractory cases. Targeted PNS at the genicular distribution is a newer option. (See my neuromodulation guide.)

Risks and complications

The complication rate is low:

• Bleeding at entry sites: usually self-limited.
• Local infection: under 1 percent.
• Skin numbness: a small patch around the knee may have reduced sensation, often permanent. Most patients do not notice or care.
• Failure to relieve pain: 20 to 40 percent of well-selected patients do not get adequate benefit.
• Motor nerve injury: extremely rare with the standard three nerves and proper sensory/motor testing before ablation. Higher risk with non-standard targets like the recurrent fibular nerve.
• Skin burn at the entry site: rare with proper grounding pad placement.

Reversibility: the nerves regenerate over months to years, so the procedure is essentially fully reversible. There is no permanent change to the knee structure.

Post-knee-replacement pain: a special case

About 15 to 20 percent of patients have persistent pain after a total knee replacement (TKA). This is one of the harder problems in orthopedics because the joint has been replaced and there is no further surgical solution that reliably helps.

Genicular ablation is increasingly used for post-TKA pain when other causes (loosening, infection, alignment) have been ruled out. The same workflow applies: diagnostic block first, then RFA if the block produces meaningful relief. Outcome data is more limited than for native-joint OA, but anecdotal experience and small case series suggest 50 to 60 percent of post-TKA pain patients get meaningful relief.

Other options for post-TKA pain include peripheral nerve stimulation, spinal cord stimulation, and (rarely) revision surgery if a structural cause is found.

Frequently Asked Questions

Will genicular ablation cure my arthritis?

No. The arthritis is structural; the procedure does not change the joint anatomy. What changes is how much pain you feel from the existing arthritis. The structural condition continues to evolve at its natural rate, but you may experience meaningful pain relief while it does.

How long does the benefit last?

Typically 9 to 18 months for most responders. Some patients get 24 months or more. The nerves regenerate over time. Repeat ablation is straightforward and effective.

Will it delay my knee replacement?

For some patients, yes. If your pain reduction is substantial and your function is good, you may delay or even decide against knee replacement. For patients who clearly need replacement (severe deformity, instability, severely impaired function), genicular ablation is a bridge, not a replacement.

Can I have it on both knees?

Yes, generally one at a time, several weeks apart. Doing both simultaneously is technically possible but usually not preferred because it makes recovery harder.

Will Medicare cover it?

For qualifying patients, yes. Medicare LCDs are increasingly favorable.

Will I be awake?

Usually under conscious sedation. Some patients prefer just local anesthetic. Either works.

What if it does not work?

You have not burned any bridges. The knee has not been changed. Knee replacement, PRP, repeat blocks, or other interventions remain options.

References

1. Choi WJ, Hwang SJ, Song JG, et al. Radiofrequency treatment relieves chronic knee osteoarthritis pain: a double-blind randomized controlled trial. Pain. 2011.
2. Davis T, Loudermilk E, DePalma M, et al. Prospective, multicenter, randomized, crossover clinical trial comparing the safety and effectiveness of cooled radiofrequency ablation with corticosteroid injection in the management of knee pain from osteoarthritis. Regional Anesthesia and Pain Medicine. 2018. (GENESIS trial)
3. El-Hakeim EH, Elawamy A, Kamel EZ, et al. Fluoroscopic guided radiofrequency of genicular nerves for pain alleviation in chronic knee osteoarthritis: a single-blind randomized controlled trial. Pain Physician. 2018.
4. Sayed D, et al. (including Schmidt KW). ASPN Best Practices and Guidelines for the Interventional Management of Cancer-Associated Pain. Journal of Pain Research. 2021. PubMed 34295184

About the Author

Keith W. Schmidt, MD is a triple board-certified interventional pain management physician practicing in Hoffman Estates, Illinois. He is Medical Director of the Neuroscience Institute Pain Program at Ascension Saint Alexius Medical Center and Chair of the American Society of Pain and Neuroscience Healthy Longevity & Age-Related Pain Committee. He completed his Pain Medicine fellowship at Rush University Medical Center.

If you would like to discuss whether genicular nerve ablation might fit your case, my office accepts referrals from across the northwest Chicago suburbs. Call (847) 981-3630 or request an appointment online.