What Is Spinal Cord Stimulation and How Does It Relieve Chronic Pain?

Living with chronic pain can feel like a daily battle with no end in sight. When medications lose their effect and injections only provide temporary relief, many patients wonder if anything else can help. Spinal cord stimulation (SCS) is one of the most advanced treatment options for people who have not found lasting relief through other methods, and it has helped thousands of patients reduce their pain and get back to the activities they enjoy.

Schedule a consultation at Kentuckiana Pain Specialists to find out if spinal cord stimulation is right for you.

At Kentuckiana Pain Specialists, Dr. Ajith Nair has over 30 years of experience performing SCS procedures in the Louisville and Elizabethtown, Kentucky area. The practice operates a Joint Commission-accredited ambulatory surgery center on-site, which means shorter wait times, lower costs, and reduced infection risk compared to hospital settings.

What Is Spinal Cord Stimulation?

Spinal cord stimulation is a treatment that uses mild electrical pulses to interrupt pain signals before they reach the brain. A small device, similar to a pacemaker, is implanted near the spine. Thin wires called leads are placed in the epidural space along the spinal cord. These leads deliver low-level electrical currents that change the way pain signals travel through the nervous system.

Instead of masking pain with medication, SCS works at the source by altering how your nerves communicate with your brain. Many patients describe the sensation as a gentle tingling that replaces the pain, although newer technology options can provide relief without any tingling at all. SCS is one of several types of nerve stimulators used for chronic pain, but it remains the most widely studied and commonly implanted option.

According to the North American Neuromodulation Society, spinal cord stimulation has been used for chronic pain management since the late 1960s. The technology has advanced significantly since then, with modern systems offering rechargeable batteries, wireless programming, and MRI-compatible designs.

How Does Spinal Cord Stimulation Relieve Pain?

SCS works based on a concept called the gate control theory of pain. This theory, first described by researchers Ronald Melzack and Patrick Wall in 1965, suggests that the spinal cord contains a “gate” mechanism that can either allow or block pain signals from reaching the brain.

When the SCS device sends electrical impulses to the spinal cord, it activates large nerve fibers that effectively close this gate. The result is that fewer pain signals pass through to the brain, and the patient feels less pain.

Modern SCS devices use several stimulation methods to achieve this effect:

• Conventional (tonic) stimulation delivers a steady electrical pulse that creates a mild tingling sensation, called paresthesia, in the area where you normally feel pain. This has been the standard approach for decades and remains effective for many patients.
• High-frequency stimulation uses pulses at 10,000 Hz (10 kHz), which is fast enough that patients do not feel any tingling. Research published in the journal Neurosurgery has shown that high-frequency SCS can provide equal or greater pain relief compared to traditional stimulation for certain conditions.
• Burst stimulation delivers electrical pulses in short clusters that mimic the natural firing patterns of neurons. Some studies suggest this approach may be better at reducing the emotional component of pain.
• Closed-loop stimulation is one of the newest advances. These systems measure the electrical signals in your spinal cord in real time and automatically adjust stimulation levels based on your body position and activity. This means consistent pain relief whether you are sitting, standing, walking, or lying down.

Considering spinal cord stimulation for your chronic pain? Contact Kentuckiana Pain Specialists to discuss which approach may work best for you.

Who Is a Good Candidate for Spinal Cord Stimulation?

SCS is not a first-line treatment. It is typically recommended after other pain management options, such as epidural steroid injections and radiofrequency ablation, have been tried for at least six months without adequate relief. At Kentuckiana Pain Specialists, Dr. Nair evaluates each patient individually to determine whether SCS is the right next step. You can learn more about the evaluation process in our guide: Am I a Candidate for a Spinal Cord Stimulator?

Common conditions treated with spinal cord stimulation include:

• Failed back surgery syndrome (FBSS) is the most common reason patients receive SCS. This condition occurs when spinal surgery does not resolve pain, or when pain returns after an initially successful operation.
• Complex regional pain syndrome (CRPS), both Type I and Type II, causes severe burning pain in the arms or legs that does not respond well to medication alone.
• Diabetic peripheral neuropathy is an emerging indication for SCS. A landmark clinical trial called the SENZA-PDN study showed that high-frequency SCS reduced pain by 76% in patients with painful diabetic neuropathy.
• Chronic radiculopathy, or nerve root pain that radiates into the arms or legs, may respond well to SCS when epidural injections and other treatments have not provided lasting improvement.
• Refractory angina and peripheral vascular disease pain may also benefit from stimulation in select cases.

Candidates also undergo a psychological evaluation to confirm that they have realistic expectations about the treatment and that no untreated psychological conditions could interfere with outcomes. For a closer look at potential side effects and what to consider, read our article on spinal cord stimulator implant risks.

What Happens During the SCS Trial Phase?

One of the biggest advantages of spinal cord stimulation is that you get to test it before committing to a permanent implant. Every patient goes through a trial period first.

Here is what the trial process looks like at Kentuckiana Pain Specialists:

1. Lead placement: Using fluoroscopic (X-ray) guidance, Dr. Nair places thin, flexible leads in the epidural space along your spinal cord. This is a minimally invasive procedure done under local anesthesia with sedation. The leads are connected to an external pulse generator that you wear on a belt.
2. Home trial period: You take the trial system home for 5 to 7 days. During this time, you go about your normal daily routine while keeping a detailed pain diary. You will note your pain levels, activity, sleep quality, and medication use.
3. Evaluation: After the trial period, you and Dr. Nair review the results together. If you experience at least 50% reduction in pain, you are considered a good candidate for permanent implantation.

The trial-first approach means there is no guesswork. You know whether SCS works for you before any permanent device is placed. According to published clinical data, approximately 70 to 80 percent of patients who have a successful trial go on to receive a permanent implant with similar or better results.

What to Expect During Permanent SCS Implantation

If the trial is successful, the next step is permanent implant surgery. At Kentuckiana Pain Specialists, this procedure is performed in the practice’s on-site Joint Commission-accredited ambulatory surgery center. This setting offers several advantages over a hospital, including 45 to 60 percent lower costs and infection rates that are roughly 50 percent lower than hospital-based facilities.

The implant procedure typically takes 1 to 2 hours under monitored anesthesia care:

1. Permanent lead placement: The surgeon positions the stimulation leads in the epidural space at the spinal level that provides the best pain coverage. Fluoroscopy guides precise placement.
2. Generator implantation: A small pulse generator, about the size of a stopwatch, is placed in a subcutaneous pocket. This is usually located in the upper buttock area or the abdomen, depending on patient preference and anatomy.
3. Programming: After placement, the device is programmed to deliver the stimulation pattern that worked best during the trial. Programming is done wirelessly using an external device.
4. Recovery: Most patients go home the same day. The practice’s ambulatory surgery center makes this possible with shorter recovery times and a more comfortable environment.

Living With a Spinal Cord Stimulator: Long-Term Results

After the implant, patients typically return for follow-up visits to fine-tune their stimulation settings. Modern SCS systems come with a handheld remote control that lets you adjust stimulation levels, switch between programs, and turn the device on or off as needed.

Research shows that patients who have a successful trial tend to maintain significant pain relief over time. A 2022 study published in the journal Pain Medicine reported that 68 percent of SCS patients maintained at least 50 percent pain reduction at the five-year follow-up mark. Many patients also report improvements in sleep, daily function, and reduced use of pain medications.

Modern pulse generators typically last 5 to 10 years for rechargeable models and 3 to 5 years for non-rechargeable versions. When the battery runs out, only the generator needs to be replaced during a relatively minor outpatient procedure, while the leads remain in place.

Patients with SCS implants should be aware of a few practical considerations:

• Newer SCS devices are MRI-conditional, meaning you can still get MRI scans under certain conditions. Your care team will provide specific guidelines.
• You will need to avoid certain activities for 6 to 8 weeks after implantation while the leads settle into position. After that, most patients return to their regular activities.
• Airport security and certain electronic devices may interact with your stimulator, but most patients find these situations easy to manage with proper preparation.

Why Choose Kentuckiana Pain Specialists for SCS?

Choosing the right provider for spinal cord stimulation matters. The success of the procedure depends heavily on proper patient selection, accurate lead placement, and expert programming after implantation.

Dr. Ajith Nair brings over 30 years of experience in interventional pain management and holds six active board certifications. As a faculty member at the University of Louisville, he stays connected to the latest research and training in neuromodulation technology. The practice has performed hundreds of spinal cord stimulation procedures and is recognized as a regional leader in implantable device therapies.

The on-site ambulatory surgery center is a significant advantage. Patients benefit from:

• Shorter scheduling wait times compared to hospital-based procedures
• 45 to 60 percent lower procedure costs
• Infection rates that are roughly half of hospital rates
• A more comfortable, patient-focused environment

Kentuckiana Pain Specialists serves patients from Louisville, Elizabethtown, Radcliff, and 16 surrounding communities across Kentucky. The practice accepts Medicare, Medicaid, 17 major commercial insurance plans, and workers’ compensation cases.

Ready to find out if spinal cord stimulation could help with your chronic pain? Book an appointment with Kentuckiana Pain Specialists or call 502-995-4004 to get started.

Frequently Asked Questions About Spinal Cord Stimulation

How long does a spinal cord stimulator last?

Rechargeable spinal cord stimulators typically last 5 to 10 years before the pulse generator needs replacement. Non-rechargeable models last 3 to 5 years. The replacement procedure is relatively straightforward because only the generator is swapped out while the existing leads stay in place.

Does spinal cord stimulation hurt?

The trial and implant procedures are done under local anesthesia with sedation, so most patients experience minimal discomfort. After implantation, there may be some soreness at the incision sites for a few days. The stimulation itself is not painful. With conventional settings, you may feel a mild tingling. With high-frequency or burst settings, you typically feel nothing at all.

Can a spinal cord stimulator be removed?

Yes. Spinal cord stimulation is considered a reversible treatment. If you decide the device is not right for you or if your condition changes, the stimulator and leads can be removed. This is one of the reasons the trial phase is so valuable, as it lets you experience the therapy before making a long-term decision.

Will insurance cover spinal cord stimulation?

Most major insurance plans, Medicare, and Medicaid cover spinal cord stimulation when medical necessity criteria are met. Coverage typically requires documentation that conservative treatments have been tried first. The team at Kentuckiana Pain Specialists handles insurance pre-authorization and can help determine your coverage before the procedure. For more details on costs, see our guide to spinal cord stimulator costs.

What is the success rate of spinal cord stimulation?

Clinical studies report that 50 to 70 percent of appropriately selected patients achieve at least 50 percent pain reduction with SCS. At Kentuckiana Pain Specialists, the mandatory trial phase helps ensure that patients who proceed to permanent implantation are likely to experience long-term benefits. The trial success criterion of 50 percent or greater pain reduction is a strong predictor of lasting results.