Patients walk into my Hoffman Estates office with a single, reasonable question: “I’ve heard there are different kinds of nerve stimulators — which one is right for me?” Here’s the short version of how I think about choosing between them. Spinal cord stimulation (SCS), dorsal root ganglion stimulation (DRG), and peripheral nerve stimulation (PNS) all use the same underlying idea — small amounts of electricity, applied to specific neural targets, to quiet chronic neuropathic pain — but they aim at different parts of the nervous system and they win in different clinical situations. As a triple board-certified pain medicine specialist (ABA Anesthesiology, ABA Pain Medicine, ABIPP), I implant all three. The choice is never about which device is “best.” It’s about which device matches the pain pattern in front of me.
The 90-second answer
If your pain is broad — most of your back, both legs, or one whole leg below the knee — I’m thinking SCS. If your pain is focal and neuropathic — your groin, the front of one knee, the top of one foot, one specific area that lights up after a hernia repair or knee replacement — I’m thinking DRG. If your pain is anchored to one named peripheral nerve — the back of your head from an occipital neuralgia, a residual limb after amputation, a post-surgical nerve entrapment that maps cleanly onto a nerve you can point to with a finger — I’m thinking PNS. Each of these targets a different rung of the pain ladder: SCS at the spinal cord, DRG at the sensory cell-body cluster just outside the cord, PNS at the peripheral nerve itself. Match the target to the pain, and outcomes follow.
What spinal cord stimulation actually does
A spinal cord stimulator delivers low-voltage electrical pulses to the dorsal columns of the spinal cord through thin leads placed in the epidural space, typically in the mid-thoracic region for back-and-leg pain. The leads connect to a small implanted generator under the skin of the upper buttock or flank. Depending on the waveform — traditional tonic, 10-kHz high-frequency (HF10), BurstDR, or closed-loop — the stimulation either replaces pain with a gentle tingling or blocks pain signals silently. The deep dive lives on the spinal cord stimulator page.
SCS is the broad-coverage option. Because the dorsal columns carry signals from a wide swath of body territory, a well-placed pair of leads can quiet pain across the lower back and both legs, or across one full leg, or — with cervical lead placement — across an arm. The trade-off is the trade-off of any wide net: SCS is less precise. It’s the right answer when the pain is diffuse, and the wrong answer when the pain is the size of a quarter and lives in one anatomic spot.
What DRG stimulation actually does
DRG stimulation targets the dorsal root ganglion — a small cluster of sensory neuron cell bodies that sits just outside the spinal cord at every spinal level, on the way out toward the body. Every sensory signal from your skin, joints, and organs passes through a DRG before reaching the spinal cord. Stimulating that ganglion selectively quiets pain signals from one specific dermatome with remarkable focus. The full clinical write-up lives on the DRG stimulation page.
DRG is the focal neuropathic option. The pivotal ACCURATE trial (Deer et al., 2017) randomized patients with lower-extremity complex regional pain syndrome (CRPS) or causalgia to DRG versus traditional SCS, and DRG outperformed SCS at both 3 and 12 months — 81.2% of DRG patients achieved ≥50% pain relief at 3 months versus 55.7% of SCS patients [Pain 2017, PMID 28030470]. For focal lower-extremity neuropathic pain — knee, foot, groin — DRG hits a target SCS can’t easily reach. It is the device I reach for when SCS coverage would be a compromise.
What peripheral nerve stimulation actually does
Peripheral nerve stimulation places a small lead directly next to a single named peripheral nerve — the occipital nerve at the back of the skull, the suprascapular nerve over the shoulder blade, the median or ulnar nerve at the forearm, the saphenous or sural nerve at the leg, the tibial nerve at the ankle. The lead delivers low-voltage stimulation that quiets that one nerve’s pain output. Full procedural detail lives on the peripheral nerve stimulation page.
PNS has two distinct flavors I use differently. Permanent implanted PNS systems (Bioness, Nalu, Stimwave, etc.) are for chronic, persistent peripheral nerve pain that we expect to need long-term therapy. Temporary 60-day PNS (the SPRINT system) is a fully external, percutaneous lead worn for 60 days and then removed — and the analgesic effect, in the right patient, persists long after the lead is gone. The mechanism is a re-training of central pain processing, not a forever device. SPRINT is the right answer when the pain is post-surgical, post-traumatic, or post-amputation and we believe central sensitization is the engine. It is one of the most patient-friendly tools in my office because there is no permanent hardware to commit to.
Side-by-side: SCS vs DRG vs PNS
| Feature | SCS (Spinal Cord Stimulation) | DRG (Dorsal Root Ganglion) | PNS (Peripheral Nerve Stim) |
|---|---|---|---|
| Neural target | Dorsal columns of spinal cord | Dorsal root ganglion, one or two levels | One named peripheral nerve |
| Best pain pattern | Broad — low back + one or both legs, or one full extremity | Focal neuropathic — groin, knee, foot, one dermatome | Anchored to a single nerve distribution |
| Sweet-spot diagnoses | Failed back surgery syndrome, diabetic neuropathy, radiculopathy, broad CRPS | Lower-extremity CRPS, post-herniorrhaphy groin pain, post-knee-replacement neuropathic pain, post-amputation distal pain | Occipital neuralgia, post-amputation (stump/phantom), post-surgical nerve entrapment, shoulder pain, post-mastectomy intercostobrachial pain |
| Strongest evidence | SENZA-RCT (HF10), SUNBURST (BurstDR), EVOKE (closed-loop) | ACCURATE (DRG vs SCS for lower-extremity CRPS/causalgia) | RCTs of SPRINT 60-day PNS for post-amputation, post-surgical, and chronic shoulder pain |
| Trial required? | Yes — 7-day external trial standard of care | Yes — 7-day external trial standard of care | Permanent PNS: yes, often a trial. SPRINT: no separate trial — the 60 days is the therapy |
| Recovery from implant | Outpatient. Light activity 2 weeks. Full activity 6 weeks. | Outpatient. Light activity 2 weeks. Full activity 6 weeks. | Often a true office-based procedure under local. Most patients back to normal within days |
| Hardware | Permanent leads + generator | Permanent leads + generator | Permanent PNS: leads + generator. SPRINT: temporary lead, no implanted generator |
| MRI compatibility | Most modern systems full-body MRI conditional | Full-body MRI conditional (current Abbott Proclaim DRG) | Varies by system — many are MRI-conditional |
| Reversible? | Yes — explant possible | Yes — explant possible | Permanent PNS: yes. SPRINT: lead removed at 60 days by design |
| Insurance friction | Well-established CPT codes, broad commercial + Medicare coverage | Covered, more documentation typically required, payer-specific medical policies | SPRINT well-covered for specific indications. Permanent PNS coverage varies; documentation-heavy |
| Battery / recharging | Rechargeable or non-rechargeable generator options | Rechargeable generator | Varies. SPRINT has no implanted battery |
| Durability of relief | Multi-year, with reprogramming and (when needed) revisions | Sustained long-term in trials, especially for focal CRPS | Permanent PNS: sustained with therapy on. SPRINT: relief frequently persists months to years after lead removal |
| When I would NOT choose it | Pain is small, focal, distal, and one-dermatome | Pain is broad, axial, bilateral, or proximal | Pain doesn’t map cleanly to a single peripheral nerve |
How I decide between SCS, DRG, and PNS in my practice
The decision is built from three questions, in this order.
Question one: How big is the pain? If a patient draws their pain on a body diagram and shades in their whole low back, both buttocks, and the back of both thighs, I am thinking SCS. The pain map is too broad for a focal device to cover without becoming a logistical mess of multiple leads at multiple levels. SCS, with one or two well-placed thoracic leads, gives me the coverage I need. If, by contrast, a patient circles a coin-sized area on the front of one knee that has burned constantly since their total knee replacement, SCS is overkill — and the broad coverage it provides is, paradoxically, less effective at quieting one tiny patch of central-sensitized neuropathic pain than a focal device aimed at the right ganglion or nerve.
Question two: Does the pain map onto a single dermatome, a single peripheral nerve, or neither? This is where DRG and PNS diverge from each other. If the pain pattern matches a dermatome — say, classic L2 anteromedial thigh pain after a groin surgery, or L4 medial calf pain after a knee replacement — DRG is built for that. If the pain pattern instead matches the territory of one named peripheral nerve — the back of the head along the greater occipital nerve, the sole of the foot along the tibial nerve, the territory of an intercostobrachial nerve after breast surgery — PNS is the cleaner target. I draw the painful area on the patient and overlay it mentally on a dermatome map and a peripheral nerve map. Whichever map fits more cleanly is the device I’m leaning toward.
Question three: Is the pain post-surgical or post-traumatic, and do I think central sensitization is the engine? If yes — and especially if the patient is reluctant to commit to permanent hardware — I think hard about temporary SPRINT 60-day PNS. A post-amputation patient with chronic stump and phantom pain, a post-knee-replacement patient with persistent quadriceps-distribution neuropathic pain, a post-rotator-cuff-repair patient with chronic shoulder pain — these are all patients where a 60-day course of percutaneous stimulation has a real chance of producing months-to-years of relief without any permanent implant. SPRINT is one of those rare treatments where saying “we’ll take it out” is the entire point.
A real example from this past quarter. Patient A is 62, post-multilevel laminectomy 4 years ago, with persistent burning down the back of the right leg from buttock to calf, plus aching low back. Pattern: broad, neuropathic, axial-plus-leg. Choice: SCS with a 10-kHz HF10 trial. Patient B is 54, two years out from a left total knee, with constant burning over the anteromedial knee that didn’t respond to a genicular RFA. Pattern: focal, one-dermatome (L3/L4), post-surgical. Choice: DRG at L3 and L4. Patient C is 38, 14 months after a forearm fracture and surgical fixation, with burning electric pain along the dorsoradial hand. Pattern: anchored to the superficial branch of the radial nerve. Choice: SPRINT PNS, 60-day course, not a permanent implant. Three patients, three devices, one decision framework.
When none of these is right
Neuromodulation is powerful, but it isn’t the answer for everyone. If your pain is primarily mechanical — facet-mediated axial low back pain that responds to a positive diagnostic medial branch block — the right answer is radiofrequency ablation, not a stimulator (see RFA vs medial branch block). If your pain is from a thickened ligamentum flavum causing neurogenic claudication, the right answer is MILD or another decompression, not stimulation (see MILD vs laminectomy vs epidural). If you have a high-grade structural problem on imaging — significant spondylolisthesis, severe foraminal stenosis with motor weakness, instability — you need a spine surgical evaluation, not a stimulator on top of an unaddressed structural problem. And if you have untreated severe depression, active substance use disorder, or unresolved psychological barriers, the literature is consistent: stimulator outcomes are worse, and we need to address those issues first. I’d rather not implant than implant the wrong patient.
FAQ
Can I have more than one type at once? Yes — and in selected patients I do. A patient with both broad low-back-and-leg pain and a separate, focal post-surgical knee pain can reasonably end up with both SCS and DRG, or with SCS and a PNS lead. The decision rests on whether one device is failing to cover a distinct second pain generator. I don’t stack devices casually.
If I had an SCS trial that failed, am I out of options? Absolutely not. A failed SCS trial often means the device wasn’t aimed at the right target. Patients with focal neuropathic lower-extremity pain who fail SCS trials are exactly the population who often succeed with DRG. Patients with one-nerve-distribution pain are exactly the population who often succeed with PNS. I review every failed trial before assuming neuromodulation isn’t right for you.
Are these procedures reversible? Yes. SCS, DRG, and permanent PNS systems can all be explanted if they don’t work or if the patient’s goals change. SPRINT 60-day PNS is designed to be removed at 60 days as part of the protocol — and any analgesic effect that persists is exactly the point.
How long does a trial last? Standard SCS and DRG trials run 5–7 days. You wear an external generator on your belt, sleep with it, drive with it, live with it. We measure pain reduction (we want ≥50%) and, just as importantly, functional improvement. Permanent PNS sometimes uses a similar trial. SPRINT does not — the 60-day course is itself the treatment.
Is one of these safer than the others? PNS and SPRINT involve no spinal canal access and therefore avoid the rare-but-serious epidural risks (epidural hematoma, dural puncture, cord injury) that exist with SCS and DRG. That said, properly performed SCS and DRG are extremely safe in experienced hands. The risk profile I quote a patient is always specific to their anatomy and the device we choose, not a generic number.
If you’ve been told you need surgery — get a second opinion first
If you’ve been told the next step for your chronic pain is more medication, more injections that haven’t worked, or a fusion you don’t want, it is worth understanding which kind of neuromodulator — if any — fits your pain pattern. The wrong device is no better than no device. The right one can give you a life back. Call my Hoffman Estates office at (847) 981-3630 to schedule a consultation, or read more on the spinal cord stimulator, DRG stimulation, and peripheral nerve stimulation pages.