Spinal Cord Stimulation
An implantable device that modulates pain signals in the spinal cord for chronic refractory pain
Spinal cord stimulation (SCS) is a neuromodulation therapy that delivers mild electrical impulses to the dorsal columns of the spinal cord, interrupting the transmission of pain signals to the brain. Unlike ablative procedures, SCS does not destroy tissue — the stimulation masks or modulates the pain signal. SCS is reserved for patients with chronic, severe pain that has not responded to conservative care, medications, and prior procedures. A defining feature of SCS is the trial phase: a temporary external system is tested for 7–10 days before any permanent implant, allowing patients to experience the therapy before committing to surgery.
Who Is a Candidate?
- Failed back surgery syndrome (persistent pain after one or more spine surgeries)
- Complex regional pain syndrome (CRPS) of the extremities
- Refractory radiculopathy not amenable to further surgery
- Chronic intractable back and leg pain unresponsive to conservative care
- Failed prior treatments including injections, physical therapy, and medication optimization
What to Expect
1Before Surgery
Candidacy requires psychological evaluation to assess pain catastrophizing, depression, and opioid dependence — all of which affect SCS outcomes. Patients undergo a thorough pain management evaluation. Insurance prior authorization is required, which typically requires documentation of failed conservative care over 6–12 months. Medical clearance for implant surgery is obtained.
2The Procedure
The procedure has two phases. Trial phase (outpatient): thin lead wires are placed percutaneously into the epidural space under fluoroscopic guidance, with an external pulse generator worn on a belt. Over 7–10 days you evaluate pain relief in your daily environment. If the trial provides ≥50% pain reduction, you proceed to permanent implant. Implant phase (outpatient or 1-night stay): the permanent leads are secured and tunneled under the skin to a pulse generator implanted in the lower back or buttock. Recovery involves 6 weeks of activity restriction to allow lead stabilization.
3Recovery
After the permanent implant, patients restrict bending, twisting, and lifting for 6 weeks to prevent lead migration while scar tissue forms around the leads. A representative programs the stimulator parameters after surgery and at follow-up visits. The device can be adjusted non-invasively with a patient remote. Batteries last 5–10 years depending on usage and are replaced with an outpatient procedure.
Typical Outcomes
50–70% of appropriately selected patients report ≥50% reduction in pain scores. Outcomes are highest in failed back surgery syndrome and CRPS. Long-term follow-up (5+ years) shows sustained benefit in the majority of SCS patients who responded to the trial. Newer high-frequency (10 kHz) and burst stimulation waveforms have improved outcomes in recent trials, providing paresthesia-free pain relief.
Risks & Considerations
- Lead migration requiring repositioning (most common complication, ~5–10%)
- Surgical site infection (1–3%)
- Device or battery malfunction requiring revision
- Unwanted stimulation paresthesias if leads shift
- Seroma or hematoma at the implant pocket site
- Hardware failure requiring explant (rare)
- MRI compatibility limitations depending on device model
Frequently Asked Questions
What does spinal cord stimulation feel like?
Traditional SCS produces a mild tingling or buzzing sensation (paresthesia) in the area of pain. Newer high-frequency (10 kHz) and burst stimulation systems are designed to be sub-threshold — patients feel no sensation at all while still receiving pain relief. Your pain specialist will recommend the appropriate waveform based on your pain pattern.
Can I have an MRI with a spinal cord stimulator?
It depends on the device. Older SCS devices were MRI-incompatible. Most modern devices are conditionally MRI compatible under specific protocols (usually 1.5 Tesla only, with the device turned off). Always inform your radiologist and MRI technologist that you have an SCS device before any MRI scan.
What happens if the trial does not work?
If the trial fails to provide meaningful relief (typically defined as <50% pain reduction), the temporary leads are simply removed in the office with no lasting consequence. You have not committed to anything. This trial phase is the primary advantage of SCS over other implanted devices — you test before you decide.
How long does a spinal cord stimulator battery last?
Non-rechargeable implanted pulse generators typically last 3–5 years depending on stimulation settings. Rechargeable devices last 7–10+ years. When the battery depletes, a minor outpatient procedure replaces the generator while leaving the leads in place. The leads themselves typically last many years longer than the battery.
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Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions you may have regarding a medical condition or surgical procedure. Last reviewed April 2026. CPT: 63650.