In short — DRG stimulation places thin leads near the dorsal root ganglion, the sensory relay point for a specific spinal level, to calm nerve pain confined to one area such as the foot, knee, groin, or chest wall. It is FDA-approved for CRPS affecting a lower limb and, like other neurostimulation options, starts with a short, reversible trial before any permanent decision.
A patient in St. Johns broke a bone in their foot over a year ago. The fracture healed on imaging, but the top of the foot still burns and stays swollen, and even a bedsheet resting against it at night is unbearable.
Another patient in Ponte Vedra had a knee replaced and did well with the incision, but a small, sharply defined area over one side of the kneecap never settled down. A prior spinal cord stimulator trial covered the thigh nicely, yet never quite reached that one small area that actually hurt.
Both stories point to the same underlying problem: pain that stays inside a tight, well-defined region sometimes needs a treatment aimed at that region specifically, rather than a broader approach that covers more territory but not necessarily the right territory.
What DRG stimulation actually is
The dorsal root ganglion (DRG) is a small cluster of sensory nerve cell bodies that sits just outside the spinal cord at each spinal level, carrying sensation, including pain signals, from a specific part of the body back toward the brain. DRG stimulation places a thin lead near this structure, under X-ray guidance, at the level that corresponds to the painful area.
Because each ganglion maps to a fairly precise region of the body, mild electrical pulses delivered there can change how pain signals from that specific area are processed, often without affecting sensation elsewhere.
A common point of confusion: DRG versus a spinal cord stimulator versus peripheral nerve stimulation
Patients often hear "nerve stimulator" and assume it is one single device regardless of where the pain sits. In practice, these are three different targets, and the distinction matters for who is a reasonable candidate.
A spinal cord stimulator places leads in the epidural space and is generally considered for broader nerve-related pain, such as pain radiating down a leg after spine surgery; because the leads sit in the spinal canal, the area of coverage can also shift somewhat with body position. Peripheral nerve stimulation instead targets one specific named nerve outside the spine, generally fitting pain that follows that exact nerve's path. DRG stimulation targets neither the spinal cord nor a single peripheral nerve, but the sensory relay point for a spinal level — which may offer more consistent coverage in selected patients for focal areas that can be harder to reach reliably with a spinal cord stimulator, such as the foot, knee, groin, or chest wall.
None of these three options is simply a "stronger" or "weaker" version of the others. Which one, if any, fits a given patient depends on where the pain sits, how it is distributed, and what has already been tried.
Who a DRG stimulator may help
DRG stimulation carries specific FDA approval for chronic pain of the lower limb from complex regional pain syndrome (CRPS) types I and II, in patients who have not improved enough with other appropriate care. This is the best-established use, and the one with the strongest evidence base.
It is sometimes considered off-label for other pain that stays confined to the territory of a specific spinal level, such as certain post-surgical or post-traumatic focal nerve pain, depending on the diagnosis, exam findings, and what conservative and other interventional options have already been tried. DRG stimulation is not intended for widespread or whole-body pain, and it does not replace a careful evaluation to confirm what is actually driving a patient's symptoms.
What happens during the trial
As with a spinal cord stimulator or peripheral nerve stimulator, treatment starts with a temporary trial rather than a permanent decision. A thin lead is placed near the dorsal root ganglion at the relevant spinal level and connected to a small external stimulator, typically worn for about a week.
Meaningful relief during that window, generally a reduction of at least half of the baseline pain, is generally required before a permanent implant with an internal generator is discussed. If the trial does not provide enough benefit, the temporary lead is simply removed and other options can be reconsidered.
What this means for patients
Pain that stays tightly confined to one area, and hasn't improved enough with medication, therapy, or other conservative care, is worth discussing with a physician who can localize the source rather than assuming the only remaining options are a higher medication dose or a broader-coverage device that may not actually reach the painful spot. The trial exists specifically so a patient and physician can confirm meaningful benefit before anything permanent is placed.
Recovery after the procedure is typically outpatient. A return to most normal activities within about a week is common after a short trial, with bending, twisting, and heavy lifting generally avoided for several weeks after a permanent implant while the lead settles into place. Follow-up visits are used for programming adjustments, and the specific activity guidance for your device should come from your care team.
Risks and infection precautions worth understanding
Possible risks include infection, bleeding, lead migration, device malfunction, nerve irritation, and inadequate pain relief despite a promising trial. Because the dorsal root ganglion sits in a small, precise space close to the nerve root, placement calls for careful image-guided technique, and because a stimulator trial leaves a temporary lead passing through the skin, infection precautions matter. Skin-preparation and antibiotic protocols vary by practice and situation — see the DRG stimulation service page for how this office approaches it, and follow the exact instructions your own care team gives you.
Seek prompt medical attention for fever, spreading redness or swelling near the lead site, or new or worsening weakness or numbness that is not simply the expected return of baseline pain once a temporary trial lead is removed.
This article is for general educational purposes only and is not a substitute for a medical evaluation. It does not diagnose any individual's nerve pain or guarantee any particular outcome from treatment. Seek prompt medical care for signs of infection at a lead site or new weakness or numbness that concerns you.
The bottom line
Pain that stays confined to one precise area is a different problem than pain that spreads broadly, and it can call for a different, more targeted approach. DRG stimulation is one option that may be worth discussing for selected patients, particularly those with CRPS affecting a lower limb, whose pain has not responded enough to medication and therapy. That conversation typically starts with a short, reversible trial before any permanent-implant decision.
A careful evaluation can help determine which structure, if any, is driving a focal pain pattern, and whether a DRG trial fits the diagnosis and history.
Frequently Asked Questions
What is dorsal root ganglion (DRG) stimulation?
DRG stimulation places a thin lead near the dorsal root ganglion, a cluster of sensory nerve cell bodies just outside the spinal cord at a specific spinal level, and delivers mild electrical pulses that can calm pain signals from the body region that level supplies. Because each ganglion maps to a fairly precise area, DRG stimulation is generally considered for pain that stays confined to one well-defined region rather than pain that is widespread.
How is DRG stimulation different from a spinal cord stimulator or peripheral nerve stimulation?
A spinal cord stimulator places leads in the epidural space and is generally used for broader nerve-related pain, such as pain radiating down a leg after spine surgery; coverage can also shift somewhat with body position. Peripheral nerve stimulation targets one specific named nerve outside the spine. DRG stimulation targets the sensory relay point for a spinal level instead, which may offer more consistent coverage in selected patients for focal areas that can be harder to reach reliably with a spinal cord stimulator, such as the foot, knee, groin, or chest wall.
What happens during a DRG stimulation trial?
A temporary lead is placed near the dorsal root ganglion at the relevant spinal level under image guidance and connected to a small external stimulator, typically worn for about a week. Meaningful relief during that window, generally a reduction of at least half of the baseline pain, is generally required before a permanent implant with an internal generator is discussed. If the trial does not provide enough benefit, the temporary lead is simply removed.
Who might be a candidate for DRG stimulation?
DRG stimulation carries specific FDA approval for chronic pain of the lower limb from complex regional pain syndrome (CRPS) types I and II, in patients who have not improved enough with other appropriate care. It is sometimes considered off-label for other focal neuropathic pain confined to a specific spinal level's territory, such as certain post-surgical or post-traumatic pain, depending on the diagnosis and exam findings.
What are the risks of DRG stimulation?
Possible risks include infection, bleeding, lead migration, device malfunction, nerve irritation, and inadequate pain relief despite a promising trial. Because the dorsal root ganglion sits in a small, precise space, placement calls for careful image-guided technique, and because the trial uses a temporary lead passing through the skin, infection precautions matter; follow the exact instructions your own care team gives you.
Related patient education
- Complex Regional Pain Syndrome After Injury or Surgery: What Patients Should Know Early
- Spinal Cord Stimulator Trial After Back Surgery: When It May Be Worth Asking About
- Peripheral Nerve Stimulation: What Patients Should Know When One Nerve Is the Problem
- Painful Diabetic Neuropathy: When Medication Isn't Enough, and What May Help Next
- Preparing for an interventional pain procedure
Related services
- Dorsal root ganglion (DRG) stimulation service overview
- Complex regional pain syndrome care
- Spinal cord stimulation
- Device troubleshooting and revision
Is your pain confined to one precise area?
A careful evaluation can help sort out what is driving a focal pain pattern, and whether a DRG trial fits your history and goals.
Contact the office about an appointment