What Are the Disadvantages of a Spinal Cord Stimulator?

Spinal cord stimulators offer real relief for many people with chronic pain, but they come with a longer list of disadvantages than most patients expect going in. The problems range from surgical complications like infection and bleeding to hardware failures, loss of pain relief over time, restrictions on medical imaging, and ongoing device maintenance. About one in ten patients ultimately has the device removed, most often because it stops working well enough. Understanding these downsides before committing to a trial implant can prevent surprises and help you weigh whether the potential benefits justify the risks for your specific situation.

Surgical Risks During Implantation

Like any procedure that involves placing hardware near the spine, spinal cord stimulator implantation carries inherent surgical risks. The most commonly discussed complications include infection, hematoma, dural puncture (an accidental hole in the membrane surrounding the spinal cord), and nerve injury.¹ The good news is that the rates of infection and other biological complications have declined over the years as surgical techniques have improved. Still, they remain a real concern that surgeons take seriously.²

Bleeding around the surgical site is one of the more worrying possibilities. A systematic review and meta-analysis found that the overall rate of any hematoma following spinal cord stimulator surgery was just under 1%. Roughly a third of those were neuraxial hematomas, meaning bleeding in or near the spinal canal itself, which occurred in about 0.3% of patients. Non-neuraxial hematomas at the incision or generator pocket site were slightly more common at about 0.6%.³ While those percentages sound small, a neuraxial hematoma can compress the spinal cord and lead to serious neurological damage if not caught quickly. The same review documented a case of intracranial hemorrhage and one death from an intracranial subdural hematoma, underscoring that even rare events can be devastating.

Infection rates reported in clinical trials for spinal cord stimulation typically run between about 7% and 10%.⁴ Most infections are superficial and treatable with antibiotics, but deeper infections near the hardware sometimes require removing the entire system to clear the infection fully. Dural puncture, which can cause severe headaches and occasionally more serious problems, also shows up in clinical trial data at around 6%.

Lead Migration and Other Hardware Failures

Hardware-related problems are among the most frustrating disadvantages of spinal cord stimulators because they can undo the pain relief you were getting, often months or years after the initial implant seemed to be working perfectly. A comprehensive review identified the full spectrum of device problems: lead migration, lead fracture, lead disconnection, generator failure, loss of battery charge, the generator physically flipping inside its pocket, hardware-related pain, and intolerable changes in the stimulation sensation.⁵

Lead migration is the single most common hardware headache. The thin wires (leads) that deliver electrical pulses to the spinal cord can shift out of position over time, which changes or eliminates the pain relief. A meta-analysis of prospective studies and randomized trials found a pooled rate of lead migration close to 10%. Among studies that tracked whether those migrations actually mattered clinically, virtually all of them did, and about 96% of the reported migrations required a revision surgery or complete device removal.⁶ That 10% figure is a pooled estimate across many studies and device types. Some individual reports have been more optimistic: one retrospective study of patients with a 10 kHz stimulation device found zero clinically significant lead migrations over six months.⁷ Other data put the revision rate for migration closer to 2% in a single-center series.⁸ The wide spread in reported rates likely reflects differences in lead type, anchoring technique, patient activity level, and follow-up duration.

Lead fracture is another possibility. The leads flex with every movement of your spine, and over years that mechanical stress can cause a break. When a lead fractures, stimulation drops out partially or completely, and repair means another surgery. Lead disconnection from the pulse generator can happen as well, producing the same loss of therapy. These hardware failures are not emergencies in the way a hematoma is, but they are deeply discouraging for a patient who finally felt some relief.

Pain at the Generator Pocket

The pulse generator, a battery-powered device roughly the size of a stopwatch, is implanted under the skin, usually in the buttock or lower back area. Some patients develop persistent pain right where the generator sits. One retrospective study of 785 cases found that about 5.5% of patients developed generator pocket pain. None of those patients improved with conservative measures like medication or physical therapy adjustments. Every single one either had the generator repositioned surgically or had the entire system removed. On average, pocket pain appeared roughly seven and a half months after the initial implant and took several more months to address surgically.⁹

That finding is striking because it means pocket pain, once it develops, tends to be a problem that only surgery can fix. It also means you’re trading one source of pain for another, at least temporarily. Pocket pain rates in broader clinical trial data range from about 1% to 12%, depending on the study.⁴ Thinner and lighter generators in newer devices may reduce this issue, but it remains one of the more underappreciated downsides.

When the Stimulator Stops Working

Perhaps the most discouraging disadvantage is that spinal cord stimulation does not work forever for everyone. Pain relief can fade over time, a phenomenon sometimes called therapy habituation. The nervous system adapts to the electrical signals, and what once blocked pain starts to feel less effective. For some patients this happens within the first year; for others, the decline is more gradual.

When pain relief fades and reprogramming the device does not help, explantation (removal of the whole system) becomes the final option. A systematic review spanning data from over 13,000 patients who received permanent implants between 1984 and 2024 found that about 10% ultimately had the stimulator removed. The leading reason was lack of efficacy and inadequate pain relief, accounting for 38% of explants. Lead failure was the second most common cause at 15%, and infection accounted for 14%.¹⁰

Those numbers mean that for roughly one in ten people who get a permanent implant, the device will eventually come out. And the most common reason is simply that it did not keep doing its job. That is a real concern to factor in at the decision-making stage, especially since the surgery to implant, the recovery, and the potential complications all happen regardless of long-term outcome.

How Well Does It Actually Work Compared to No Device?

The effectiveness of spinal cord stimulation varies enormously depending on the technology used, the underlying condition being treated, and the individual patient. A systematic review comparing spinal cord stimulation to conservative medical management (meaning medications, physical therapy, and injections) for persistent spinal pain found that responder rates for achieving at least a 50% pain reduction ranged from 14% to 80% in the tonic stimulation groups, versus just 3% to 20% in the conservative management groups.⁴ That is a wide range. The average improvement in pain levels over six months varied between about 16% and 48% for tonic stimulation. Sham stimulation, where the device is implanted but not turned on, produced improvements of 10% to 16%, suggesting a meaningful placebo component.

Functional improvement followed a similar pattern. At six months, function improved by 21% to 45% in tonic stimulation groups versus 0% to 21% for conservative management. These numbers show that spinal cord stimulation generally outperforms doing nothing new, but also that a sizable minority of patients do not get meaningful relief, and placebo effects account for part of the benefit. The fact that some trials show response rates as low as 14% for a surgical intervention is sobering.

MRI Restrictions and Image Quality

One of the most practically disruptive disadvantages is what happens when you need an MRI. Spinal cord stimulators contain metal components and electronics that interact with the powerful magnets and radio-frequency energy used in MRI scanners. Most modern devices are classified as MRI-conditional, meaning they are allowed in the scanner only under specific conditions: certain body regions, particular field strengths, limited scan durations, and specific device settings. Older devices may not be MRI-compatible at all.¹¹

Even when a scan is allowed, the leads and pulse generator can degrade image quality. If the generator or the electrodes are within or near the area being imaged, artifacts like distortion and signal dropout can make parts of the image unreadable. This can be a real problem if you develop a new medical condition that requires imaging of the spine or abdomen. Your doctor may have to rely on CT scans or other alternatives that provide less soft-tissue detail. For some patients, especially those with conditions that require regular MRI monitoring, this limitation alone is a strong argument against getting a stimulator.

The Recharging Commitment

Rechargeable pulse generators, which are the norm for many newer systems, require regular charging sessions. You hold or strap a charging pad against your skin over the implanted generator, and the battery charges wirelessly. This sounds simple enough, but the time adds up. A meta-analysis of rechargeable generators found that the average charging burden for spinal cord stimulation devices was about 97 minutes per week.¹² That is roughly an hour and a half every week spent sitting still with a charger pressed to your body.

The same analysis found that longer recharge times correlated with more complications, including unintentional interruptions in therapy and hardware failures. If you forget to charge or fall behind schedule, the stimulator can shut off mid-day, and your pain comes roaring back. Non-rechargeable generators avoid this hassle but have shorter battery lives, typically requiring surgical replacement every few years, which brings its own costs and risks.

Financial Cost

Spinal cord stimulation is expensive. An Australian study tracking private health insurer costs found that the median cost to the insurer for just the trial implant was about $13,700 (Australian dollars), while the total cost of a definitive implant, including the device, medical and hospital costs for the initial procedure, and any re-interventions, came to roughly $55,600.¹³ Costs in the United States tend to be comparable or higher. Insurance coverage varies widely: some plans cover the procedure in full after prior authorization, while others deny it or impose lengthy appeals. Out-of-pocket costs for copays, deductibles, and the ongoing reprogramming visits can accumulate over years.

The financial picture also depends on whether the device stays in and keeps working. If you end up needing a revision surgery for lead migration or a generator replacement for a depleted battery, each of those is another hospital stay and another bill. If the device ultimately gets explanted, the investment in the initial implant yields no long-term return.

Psychological Factors That Predict Poor Outcomes

Not everyone is an equally good candidate for spinal cord stimulation, and some of the strongest predictors of failure are psychological rather than physical. A literature review of psychiatric screening for spinal cord stimulation identified several psychological factors that predispose patients to poor outcomes: depression, anxiety, somatization (experiencing psychological distress as physical symptoms), catastrophizing about pain, poor coping mechanisms, dysfunctional relationships, childhood trauma, and elevated pain perception.¹⁴

Most reputable pain programs require a psychological evaluation before approving you for a stimulator trial, and this is one area where that gatekeeping genuinely serves patients. If untreated depression or catastrophizing is amplifying your pain experience, a stimulator is unlikely to fix the problem and may leave you worse off financially and emotionally. Addressing the psychological component first can both improve stimulator outcomes if you do proceed and, in some cases, reduce the need for the device entirely.

Challenges for Older Adults

Spinal cord stimulators are commonly considered for people in their 60s, 70s, and beyond, since chronic pain conditions accumulate with age. But older adults face a distinct set of challenges. Age-related spinal degeneration can make lead placement more difficult and increase the risk of complications during the procedure. Older patients are also more likely to have other medical conditions that raise surgical risk, and changes in how their bodies process medications can affect recovery and postoperative management.

The recharging burden may also hit older adults harder. Reduced manual dexterity, cognitive changes, or simply living alone without someone to help position the charger can make the weekly commitment more difficult. And because battery replacement surgery carries cumulative risk with each procedure, a device implanted at age 70 that needs a new generator at 75 and again at 80 presents a different risk calculus than the same device in a 50-year-old.

Newer Technologies and the Trade-offs They Bring

High-frequency stimulation systems, particularly those operating at 10 kHz, have gained popularity because they can provide pain relief without the tingling sensation (paresthesia) that traditional low-frequency stimulators produce. Some patients find paresthesia uncomfortable or distracting, so eliminating it is a genuine advantage. However, high-frequency systems deliver significantly more power to surrounding tissues than conventional devices.¹⁵ That higher power delivery means greater battery drain, which translates directly to more frequent or longer charging sessions. It also raises questions about tissue heating near the electrodes, though clinical studies have not shown this to be a practical safety concern at approved settings.

Burst stimulation is another newer waveform that aims to mimic natural nerve firing patterns. In the systematic review of persistent spinal pain, burst stimulation showed mean pain improvement of 16% to 17% at six months, which was notably lower than the 16% to 48% range seen with tonic stimulation, though the burst data came from fewer studies.⁴ No single waveform technology has eliminated the fundamental disadvantages of implanted hardware, potential loss of efficacy, and the need for revision surgeries.

What Happens if You Need Spine Surgery Later

A spinal cord stimulator does not rule out future spine surgery, but it complicates the picture. In a review of 383 patients who had received paddle or percutaneous stimulators, about 6% went on to need additional spine surgery either while the stimulator was in place or after its removal. The most common procedures were lumbosacral decompression and fusion, typically for spinal stenosis or deformity.¹⁶ Having stimulator hardware in the epidural space means surgeons must work around leads and possibly remove them before operating, adding complexity and risk to an already difficult procedure. If you have a progressive spinal condition, the possibility that you may need further surgery is worth discussing with your pain specialist before implanting a device that could complicate future interventions.

Driving and Daily Activities

Most patients worry about whether a stimulator will limit normal activities, especially driving. A survey of 78 patients with spinal cord stimulators found that 97% were active drivers, and 80% reported using their stimulator consistently while behind the wheel for pain relief. About 11% reported motor vehicle accidents, but none were related to the stimulator itself.¹⁷ Manufacturers and physicians generally advise caution during the initial adjustment period, when unexpected stimulation changes could be distracting, but do not impose blanket driving restrictions.

Other daily life adjustments are more subtle. You cannot go through certain security screening systems without notifying personnel. Contact sports are discouraged because a hard blow to the generator site or spine can damage hardware. Bending, twisting, and heavy lifting are restricted during the weeks after implantation to let the leads settle into position, and even after that healing period, aggressive physical activity can contribute to lead migration. The device is not invisible, either. Many patients can feel the generator under their skin, and some find the sensation distracting or uncomfortable even without developing the formal complication of pocket pain.