What this video covers
- How one injured nerve drives ongoing pain, how the spinal cord turns that signal up, and how stimulation is thought to close the pain gate
- How a fine coiled wire (lead) is placed through the skin under ultrasound, with no implanted battery
- Why relief sometimes lasts after the 60-day lead comes out, what the follow-up data does and does not prove, and why no one knows yet if it lasts past a year
- What the randomized trials found, and which were blinded, in chronic low back pain, pain after knee replacement, and pain after amputation
- How peripheral nerve stimulation differs from spinal cord stimulation, and when each one fits
- The real risks: skin irritation, itching under the dressing, and a shallow infection where the lead leaves the skin
- MEDICAL DISCLAIMER: This content is for educational purposes only and is not medical advice. It does not substitute for professional diagnosis or treatment. Always consult a licensed healthcare provider regarding your condition. Viewing this video does not establish a doctor-patient relationship.
A 60-day peripheral nerve stimulator is a fine temporary wire placed under ultrasound near one nerve. An outside pulse generator runs it for sixty days. Then it is pulled out in the office. It tests whether stimulating that one nerve eases your pain before anyone commits you to a permanent implant.
Fourteen months after a total knee replacement, the X-ray is perfect. No loosening, no infection, nothing a surgeon can see. And the knee still burns — a band of fire across the front, a leg that cannot take stairs. You were told the surgery was a success, and then you were told to accept this.
This article explains a kind of treatment that sits between a pill bottle and a permanent implant. It is a fine temporary wire placed near one nerve, worn for sixty days, and then pulled back out. We cover what the wire is thought to do and why a nerve can keep firing long after the tissue has healed. We cover what the randomized trials actually found. And, just as important, we show where the evidence stops.
Who is peripheral nerve stimulation for?
This is the first thing to get straight, because confusing it is the commonest reason the treatment fails.
Peripheral nerve stimulation (PNS) has two separate uses. The first is pain made or carried by one nerve you can point to. Think of a branch of the femoral or sciatic nerve left firing after a knee replacement, or the nerves of a stump after amputation. The second use is a different job entirely: stimulating the lumbar medial branches for low back pain centered in the spine. The goal there is to wake up deep spine-steadying muscles that have shut down. That second use is not about quieting one painful nerve. It works through the muscles, by a different route.
If your pain is neither, if it is widespread, whole-body, and cannot be traced to a target, then a lead is a selection error, not a treatment.
How does peripheral nerve stimulation work?
Here is the model, stated at the confidence the data supports and no further.
A fine lead placed near the target nerve sends a low current. At that level it mostly fires the large-diameter myelinated fibers. Those are the fibers that carry touch and position sense, not the small bare fibers that carry pain. That input is believed to switch on blocking nerve cells in the dorsal horn of the spinal cord. It is also thought to call in pain control from the brain.
That is the gate-control model. It is a model.
There is a second, bolder claim tied to the sixty-day system. It says relief can outlast the wire, and that this carry-over reflects a real drop in central sensitization (a turned-up spinal cord). That mechanism is hypothesized. No one has shown it directly in humans. As Dr. Gurpreet Singh Padda, MD, MBA, MHP puts it in the video, anyone who states it as settled fact is selling you something.
Why does a knee still burn after replacement when the X-ray is normal?
Surgery is controlled trauma. Cutting, pulling and heat can leave a branch of a nerve firing when it should be quiet. It fires on its own, with no injury left to report.
That barrage arrives at the dorsal horn, and the dorsal horn turns the gain up. Thresholds drop. Inhibitory tone falls away. Ordinary touch begins to register as pain. That is central sensitization, and it is why the felt experience and the film can disagree so completely.
It also explains the shape of the symptom. The pain is a band of burning, not a deep ache, because it follows a nerve’s territory, not a joint’s. The sheet on the knee at night is unbearable, because the amplifier cannot tell light touch from injury. Stairs are impossible, because a thigh muscle guarded for two years has wasted. And once the amplifier is set, injecting a perfectly good knee changes nothing. You are treating a joint that is no longer the problem.
What standard care leaves out
Nothing here is an accusation against any physician. It is a description of a gap.
The system has two speeds for nerve pain. Speed one is pills: gabapentin, then duloxetine, then a shrug. Speed two is a permanent implant. That means hardware that stays in your body and a generator in a pocket under the skin. The device will need service, replacement or removal someday. Sometimes a permanent system is exactly right. But it is a big decision to make first, before anyone has confirmed that stimulating a nerve helps you at all.
Between those two speeds, most patients are offered nothing.
Part of the reason is timing. The sixty-day percutaneous (through-the-skin) system is newer, and its randomized data only landed in the last few years. Part of it is that a temporary wire is a smaller procedure than an implant, and smaller procedures get talked about less. The point is not why you were not offered it. The point is that this option exists, and the evidence is now good enough that someone should have named it.
What does a 60-day peripheral nerve stimulator procedure involve?
Most people hear “neuromodulation” and picture a battery buried in their back. This is not that.
Under ultrasound, the doctor watches the needle in real time as it moves to the target nerve. A coiled wire thinner than a pencil lead is threaded percutaneously (through the skin) to sit near the nerve, not against it. There is no cut and no implanted battery. The lead leaves the skin and connects to a small outside pulse generator worn on a strap for sixty days. Then it is pulled out in the office. Step-by-step details, including what to expect at placement and removal, are on the peripheral nerve stimulation treatment page.
The lead is built to come out whole, and in nearly every case it does. Dr. Padda names one consent point on camera anyway. A fine coiled wire that has sat in tissue for two months can, rarely, break on removal and leave a piece behind. That was not among the side effects reported in the largest trial. Treat it as a risk the physician raises at consent, not as a published rate.
What do the randomized trials show about peripheral nerve stimulation?
Three trials carry this treatment. They are worth reading carefully rather than in headline form.
The knee replacement trial — the only double-blind one
Goree and colleagues ran the trial that matters most for its design, published in Neuromodulation in 2024. It was randomized, double-blind and placebo-controlled.[1] Both groups got real leads placed under ultrasound at the femoral and sciatic nerves, the same way. Only one group’s device sent current. Neither the patients nor the assigned evaluator knew which.
Sixty percent of the stimulation arms (12 of 20) reached at least 50% pain relief, against 24% (5 of 21) with sham (p = 0.028). Read the timing carefully. The leads stayed in for eight weeks. The main result was measured over weeks five to eight, while the wires were still in place. That number says stimulation worked. It is not proof that relief lasted after removal.
Walking distance improved 47% in the stimulation arms, while the sham group fell 9%. But that is a secondary result. It was measured on fewer patients (18 vs 20 finishing the test), at a p-value sitting right on the line (p = 0.048). It does not carry the weight of the main result. Forty-one patients were randomized in all.
RESET — larger, more pragmatic, and unblinded
McCormick and colleagues published RESET in Pain Medicine in 2026. It enrolled 230 patients with chronic low back pain. They compared sixty-day lumbar medial branch stimulation with usual interventional care.[2] Fifty-five percent versus 26% reached at least 50% relief at three months, and it held through six months.
Be careful with that 55%. Blinding was not possible after randomization. This was an open-label trial, so hope and expectation cannot be ruled out when the patient can feel the device running. And the trial left out a great many people: anyone with pain shooting down the leg, past low back surgery, a body mass index over 40, or radiofrequency ablation of those same medial branches within six months. If you are in one of those groups, 55% is not your number. Nobody has measured your number.
Amputation — twelve months, but only nine patients
Gilmore and colleagues, in Regional Anesthesia and Pain Medicine in 2020, followed people who lost a leg to trauma.[3] Twenty-eight were randomized. One group got eight weeks of stimulation. The other got four weeks of placebo and then crossed over to four weeks of stimulation. At twelve months, six of the nine stimulation patients still being followed responded. None of fourteen in the placebo group did.
That comparison is not what it looks like at first glance. The placebo group’s zero was measured at its own four-week mark, before those patients crossed over to stimulation. There was no twelve-month control group. And the nine is what was left of the stimulation group at a year, not the number enrolled. The authors themselves concluded only that sixty-day stimulation may provide carry-over effects.
What all three have in common
Two of the three trials enrolled fewer than 45 patients. All three were sponsored or staffed by the device manufacturer. RESET’s primary funding came from the U.S. Department of Defense, with additional funding from the study’s sponsor. None of that invalidates the results. It is context you are entitled to have before you weigh them.
And the honest limit on how long it lasts: the longest published follow-up is twelve months, in nine patients. Past a year, nobody knows.
What this means for evaluation
The question is not whether you want a stimulator
It is whether your pain traces to a nerve. Choosing patients runs on a differential, and each option has to be ruled in or out. Is the hardware intact, or is it loose or carrying a low-grade infection? Is it pain from a nerve root, or from a nerve out in the limb? Is it complex regional pain syndrome? Or is it widespread nociplastic pain that no single lead can touch?
A diagnostic ultrasound-guided block of the candidate nerve is what settles it. If numbing that nerve does not move your pain, that nerve is probably not carrying it — and a lead should not be placed on hope. Probably is deliberate. A block can fail technically, and more than one nerve can feed a region. A negative block sends the physician back to the differential, not to a refusal.
What sixty days are actually like
Expect to be annoyed for two months. The largest trial was the 230-patient low back study. In it, mild skin irritation hit about 31.5% of people. Itching under the dressing hit about 19.8%. A shallow skin infection hit 2.7% per lead exit site, and granulomas (small lumps) hit 1.4% per lead exit site. Roughly 8% had pain from the device itself, and about 5% reported discomfort, along with some muscle spasms and stinging. None were serious. No serious, unexpected study-related side effects occurred.[2]
Practically: the exit site has to stay dry. No baths, no swimming, for two months.
What a good result looks like
The following is an illustrative composite — a picture assembled from many patients with this condition, not one person’s chart, and not a patient testimonial.
Two years out from a knee replacement. Burning across the front of the knee, sleep broken most nights, a quadriceps wasted by two years of guarding the leg. Two surgeons had declined revision, correctly — there was nothing to revise. A diagnostic block localized the generator. What was hard: the itching under the dressing, keeping the exit site dry, and week three, when relief was only partial and doubt set in.
Walking did not come back on its own. A device does not build a quadriceps; eight weeks of loading a leg that had been guarded for two years is what turned relief into stairs. At six months the pain was better. It was not gone. A leg that carries you up a staircase and still complains at the top is what a good result looks like here. Some people get less, usually those whose pain was never truly focal. Individual results vary.
And if the pain comes back
Then the sixty days were not wasted. You now have an answer to the only question that mattered — whether stimulating that nerve helps you. That is what turns a permanent system into a reasoned decision instead of a gamble.
Frequently asked questions
Is a 60-day nerve stimulator the same thing as a spinal cord stimulator implant?
No. A permanent implant puts hardware and a pulse generator inside your body, in a pocket under the skin. That device will need service, replacement or removal someday. The sixty-day system is a fine coiled wire placed percutaneously (through the skin) under ultrasound near a peripheral nerve. There is no cut and no implanted battery. It connects to a small outside generator worn on a strap and is pulled out in the office after two months. One of its main jobs is to answer, before you commit to permanent hardware, whether stimulating that nerve helps you at all.
How a permanent stimulator trial works is covered in What a Spinal Cord Stimulator Trial Actually Tells You.
Will the relief last after the wire comes out?
Sometimes, and nobody can promise it in your case. Relief that outlasts the lead is the new claim behind the sixty-day system. It is thought to reflect a turned-down spinal cord (reduced central sensitization), but no one has shown that directly in humans. Be careful how the trial numbers get used here. The double-blind knee replacement result (60% versus 24% with sham) was measured over weeks five to eight, with the leads still in place. So it shows that stimulation worked, not that relief lasted after removal.[1] The only follow-up that reaches twelve months is the amputation study. It rests on nine patients with no twelve-month control group. Its authors concluded only that sixty-day stimulation may provide carry-over effects.[3] Past a year, the data simply runs out. Individual results vary.
How do you know whether my pain is even coming from one nerve?
With a diagnostic block. The doctor places a small amount of numbing medicine around the suspected nerve under ultrasound. If numbing that nerve clearly changes your pain, that nerve is likely carrying it. If it does not, no lead should go there. A block can still fail for technical reasons, and more than one nerve can supply an area. So a negative block means going back through the differential. Is the hardware intact, or loose or infected? Is the pain from a nerve root or a nerve in the limb? Is it complex regional pain syndrome, or widespread pain that no single lead can reach?
What are the risks, and will I have to stop my medications?
Problems in the largest trial, the 230-patient low back study, were minor but common. Mild skin irritation hit about 31.5%. Itching under the dressing hit about 19.8%. A shallow skin infection hit 2.7% per lead exit site, and a granuloma 1.4% per lead exit site. Roughly 8% reported pain from the device itself. No serious, unexpected study-related side effects occurred.[2] Separately, your physician should tell you at consent that a fine coiled wire in tissue for two months can rarely break on removal. That is consent language from your physician, not a rate reported in any of these trials. As for medication: nothing here requires you to stop what you take, and any change is a decision made with your prescriber. Do not start, stop, or change any medication without consulting your physician.
I have widespread pain all over my body. Would this help me?
Probably not, and that matters more than any success rate. Peripheral nerve stimulation is not a general pain treatment. It targets pain made or carried by one nerve you can point to. In the separate lumbar medial branch use, it targets axial (central) low back pain driven by deep spine-steadying muscles that have shut down. A single lead cannot address widespread nociplastic pain. Treating it that way is a selection error, not a treatment.
What is a peripheral nerve stimulator?
It is a coiled wire thinner than a pencil lead. It is threaded through the skin under ultrasound to sit near one target nerve. The wire connects to a small outside pulse generator worn on a strap. There is no cut and no implanted battery. The generator sends a low current that favors the large touch and position fibers. That is believed to close the pain gate in the spinal cord.
What is the success rate of peripheral nerve stimulation?
In the double-blind knee replacement trial, 60% of patients getting stimulation reached at least 50% pain relief, against 24% with sham. That was measured while the leads were still in place. In the larger open-label low back trial, 55% versus 26% reached at least 50% relief at three months, and it held through six months. That trial left out many patients, so those numbers may not be yours. Individual results vary.
How long does a peripheral nerve stimulator trial last?
The temporary system is worn for sixty days, then the lead is withdrawn in the office. During those two months the exit site has to stay dry: no baths and no swimming. Expect some annoyance, such as itching under the dressing. The point of the sixty days is to learn whether stimulating that one nerve helps you before anyone discusses a permanent implant.
Where is this done, and how do I get evaluated?
Peripheral nerve stimulation is offered at the Padda Institute Center for Interventional Pain Management, 4477 Woodson Rd, Suite 100, St. Louis, MO 63134, right next to St. Louis Lambert International Airport, with a second location at 12174 Natural Bridge Rd, St. Louis, MO 63044. We serve the St. Louis region, Missouri and Illinois. Call (314) 481-5000 or text (314) 886-5902, Monday through Friday, 8:00 AM to 5:00 PM. Bring the specifics: where exactly it burns, what makes it worse, and what has already failed. That is how a nerve gets found.
Our Locations page has the address, hours and directions.
Key takeaways
- Peripheral nerve stimulation treats pain made or carried by one nerve you can point to. There is also a separate lumbar medial branch use for axial (central) low back pain. It is not a treatment for widespread pain. Choosing the right patient is the biggest factor in whether it works.
- The gate-control explanation is a model, not a proven fact. No one has shown directly in humans that relief after the lead comes out is caused by a turned-down spinal cord.
- The evidence is real but narrow. There is one double-blind sham-controlled trial in 41 patients after knee replacement (60% vs 24%, measured while the leads were still in place). There is one larger but open-label trial in 230 patients with low back pain (55% vs 26%, with many people left out). And there is a twelve-month amputation follow-up resting on nine patients with no twelve-month control. The device maker sponsored or staffed all three. No one knows if it lasts past a year.
- The sixty-day wire is a test as well as a treatment. It answers whether stimulating that nerve helps you before anyone implants permanent hardware.
- The question to bring to an evaluation is not whether you want a stimulator. It is whether your pain traces to a nerve. A diagnostic block under ultrasound is what answers it.
This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician. To be evaluated at the Padda Institute Center for Interventional Pain Management, call (314) 481-5000 or text (314) 886-5902.
References
- Goree JH, Grant SA, Dickerson DM, Ilfeld BM, Eshraghi Y, Vaid S, Valimahomed AK, Shah JR, Smith GL, Finneran JJ, Shah NN, Guirguis MN, Eckmann MS, Antony AB, Ohlendorf BJ, Gupta M, Gilbert JE, Wongsarnpigoon A, Boggs JW. Randomized Placebo-Controlled Trial of 60-Day Percutaneous Peripheral Nerve Stimulation Treatment Indicates Relief of Persistent Postoperative Pain, and Improved Function After Knee Replacement. Neuromodulation. 2024 Jul;27(5):847-861. PMID 38739062. PubMed
- McCormick ZL, Lester DD, DePalma MJ, Gilmore CA, Li S, Jameson JB, Desai MJ, Weaver TE, Lad SP, Davidoff SJ, Trainor DM, Amirdelfan K, Engle MP, Deer TR, Lee TS, Vetri F, Bindal M, Tornero-Bold MA, Nasseri MN, Cohen SP, Clark WH, McGee MJ, Boggs JW. Comparison of percutaneous 60-day peripheral nerve stimulation of the lumbar medial branches to usual care with standard interventional management for chronic low back pain – a multicenter pragmatic randomized controlled trial (RESET). Pain Med. 2026 Apr 1;27(4):462-473. PMID 41138174. PubMed
- Gilmore CA, Ilfeld BM, Rosenow JM, Li S, Desai MJ, Hunter CW, Rauck RL, Nader A, Mak J, Cohen SP, Crosby ND, Boggs JW. Percutaneous 60-day peripheral nerve stimulation implant provides sustained relief of chronic pain following amputation: 12-month follow-up of a randomized, double-blind, placebo-controlled trial. Reg Anesth Pain Med. 2020;45(1):44-51. PMID 31740443. PubMed
Get the diagnosis before you accept the procedure
Bring your imaging and your history to the Padda Institute Center for Interventional Pain Management in St. Louis. We will tell you which structure is actually generating your pain — and what the evidence does and does not support.
Or call or text us.
Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
