Why there is a year in between

The orthopedic office says the knee is bone on bone, then hands you a list. An A1c under a number. A weight under a number. A date months out. And six to twelve weeks before anyone trusts you on a ladder or a forklift. A rotating shift in the Wood River refinery corridor has no twelve-week pause built in. Neither does a job on the floor at the Granite City steel works, or ten hours on concrete in the warehouses around Edwardsville. The schedule decides when surgery happens, and the knee is told to wait.

It does not wait quietly, and the reasons are not only mechanical. Cartilage is living tissue with its own fuel needs. In a body running on high insulin and low-grade metabolic inflammation, the cartilage breaks down faster than the joint can rebuild it. Fat around the joint and the waist leaks inflammatory signals. Those keep the joint lining irritated. The third driver is the one the surgeon’s list ignores: a job that loads the knee all shift and leaves no room to move it any other way.

Which nerves does a genicular nerve block target?

The genicular nerves are thin sensory branches that hug the thigh bone and shin bone where they flare into the joint. They move nothing and hold nothing steady. Their only job is carrying the knee’s complaint to the spinal cord. Under fluoroscopy (live X-ray) we place a needle where each of the three main branches crosses bone at a predictable spot. Then we deposit local anesthetic there. The needle never enters the joint.

That matters because of what most people are offered while they wait: steroid inside the joint. The trial that tested it properly did not favor it. In 140 adults with symptomatic knee osteoarthritis and synovitis (an inflamed joint lining), triamcinolone into the joint every twelve weeks for two years caused more cartilage loss on MRI than saline. It gave no advantage in pain. A treatment for the waiting year should not spend cartilage during it. So we work on the wiring instead.

What is the difference between a genicular nerve block and radiofrequency ablation?

The A1c on the surgeon’s list is not arbitrary, and the waiting year is when it moves

Dr. Gurpreet Singh Padda, MD, MBA, MHP spent twenty years telling patients with an A1c in the mid-sixes that the number was not too bad. He was wrong, and a knee is one of the places the error shows. A systematic review of seventeen studies of total joint replacement found poor blood sugar control associated with more surgical-site infection. High glucose around the time of surgery was linked to infection in all five studies that measured it directly. The traditional 7 percent cutoff did not survive as a clean line. There is no safe side of the number, only a slope.

That slope is why a quiet knee and a moving A1c belong in one plan. Lower insulin lowers the inflammatory tone in the joint lining. It improves blood flow in the bone under the joint surface. And a knee that tolerates a walk rebuilds the muscle that clears glucose. That is why roughly 40 to 50 percent of the plan here is behavior and lifestyle work. Acceptance and Commitment Therapy is delivered in-house by a licensed, pain-trained behavioral clinician. The block buys the window; what fills it is on metabolic health and pain.

How well does genicular nerve ablation work?

The strongest recent summary is a 2026 meta-analysis of eight sham-controlled randomized trials. It covered 627 adults with knee osteoarthritis who were not candidates for replacement, close to the people this page is written for. Against sham, ablation lowered pain by about 1.65 points on a ten-point scale at twelve weeks. It improved function at twenty-four, with conventional monopolar ablation doing best. Heterogeneity was high, meaning results varied widely between trials, and long-term data were thin.

Lasting results past a year rest on smaller numbers. An extension of the cooled-ablation trial followed 33 of its original 83 ablation patients to two years. Of the 18 still evaluated at 24 months, 11 reported at least half their pain gone. That is a real signal in a self-selected group. A national pragmatic trial of around 900 knees across 30 US centers is now comparing a joint injection, a genicular block and ablation with a blinded sham. Its results are not in. None of the trials captured the patient with an A1c of 9, or the job that forbids rest. Our position: a positive test block is the gate for all of them. Relief that fades early is usually telling us about the terrain around the joint, not the technique.

What happens during a genicular nerve block?

Risks, plainly: bruising and soreness for a few days, and rare infection. There may be an occasional patch of numb or oddly sensitive skin after ablation that fades as the nerve recovers. We also tell you to expect a burning ache in the first week or two. The recovery window is hours, not weeks.

Frequently asked questions

Can I do this while I am already on a surgical waiting list?

That is the most common reason people come for it, and it does not get in the way of the replacement. We coordinate timing with your surgeon. The wider choice between waiting, injecting and operating is on knee pain.

Does the test block treat anything, or is it only a test?

Its relief lasts hours, so its value is the information, which decides whether ablation is aimed at the right structure. What a few hours of relief can and cannot tell us is in what a diagnostic block tells you.

How many trips from Illinois does this take?

Two procedure visits at minimum. They are staged so the diagnosis is made before you commit to the second drive. How visits are planned for a long-drive patient is on for Illinois patients.

If the relief from ablation fades in four months, did it fail?

Early fading is information. It may be a regrown nerve, which can be treated again. Or it may be a joint sitting in unaddressed metabolic inflammation, which a probe cannot fix. How we read a shrinking response is the subject of when injections stop working.

How painful is a genicular nerve block?

The skin is numbed at the three target points before any needle goes deeper, and the needles stop at bone beside the knee, never inside the joint, and no sedation is used. Expect bruising and soreness for a few days. After an ablation, a burning ache in the first week or two is common, and we tell you to expect it before you leave.

What are the risks of genicular nerve ablation?

The risks are small and mostly short-lived: bruising and soreness for a few days, a rare infection, and sometimes a patch of numb or oddly sensitive skin that fades as the nerve recovers. A burning ache in the first week or two is expected. The genicular nerves move nothing and hold nothing steady. So turning them off does not take away strength or stability.

What happens if a genicular nerve block doesn’t work?

A test block that changes little tells us the knee is not the whole story. An arthritic hip, or an irritated L3 or L4 nerve root in the low back, can send pain to the same spot. That is why we examine both before any needle goes near the knee. You hear the result the same day, with a direction to look next instead of a second procedure.

How often can you have genicular nerve ablation?

The heated nerve regrows over months. That is why relief is not permanent, and the ablation can be repeated when the pain returns. Unlike steroid injected into the joint, it carries no stacking toll and no blood-sugar cost for a diabetic patient. If relief fades early, that usually points to the metabolic inflammation around the joint, not the technique, and we look there too.

What is the recovery time after a genicular nerve block?

Hours, not weeks. You test the knee before you leave, walking and climbing a step, and keep a pain diary on the drive home. Bruising and soreness can last a few days. After an ablation, allow a few days before judging the result, with follow-up by telehealth where clinically appropriate.

Related reading

• Knee pain
• Image-guided joint injections
• Radiofrequency ablation
• Hip pain
• Injured at work