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Spinal Cord Stimulation – Pain Therapy Explained

Spinal cord stimulation is a minimally invasive pain therapy in which electrical impulses are delivered to the spinal cord via an implanted electrode to relieve chronic pain.

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Things worth knowing about "Spinal cord stimulation"

Spinal cord stimulation is a minimally invasive pain therapy in which electrical impulses are delivered to the spinal cord via an implanted electrode to relieve chronic pain.

What is Spinal Cord Stimulation?

Spinal cord stimulation (SCS) is a minimally invasive neuromodulation procedure used to treat chronic pain. Thin electrodes are implanted near the spinal cord and connected to a small pulse generator, which delivers targeted electrical impulses to interfere with pain signal transmission to the brain. SCS is typically considered when conservative treatments and medications have failed to provide adequate pain relief.

Mechanism of Action

The precise mechanism of spinal cord stimulation is not yet fully understood, but several key theories have been proposed:

Gate control theory: Electrical impulses activate inhibitory nerve fibers in the spinal cord, effectively blocking pain signals from reaching the brain.
Neurotransmitter modulation: Stimulation promotes the release of pain-inhibiting neurotransmitters such as gamma-aminobutyric acid (GABA) and serotonin.
Sympathetic nervous system inhibition: In cases involving poor circulation, SCS can improve blood flow and thereby reduce ischemic pain.

Indications

Spinal cord stimulation is used for a range of chronic pain conditions, including:

Failed back surgery syndrome (FBSS): Persistent back and leg pain following spinal surgery
Complex regional pain syndrome (CRPS): Chronic pain after injuries or surgery to limbs
Peripheral arterial occlusive disease (PAOD): Pain due to reduced blood flow in the legs
Diabetic neuropathy: Nerve pain caused by diabetes mellitus
Refractory angina pectoris: Chest pain in patients with inoperable coronary artery disease
Radiculopathy: Pain caused by compressed or irritated nerve roots

Procedure

Trial Phase

Before permanent implantation, a trial stimulation phase of 7 to 14 days is typically conducted. Electrodes are placed temporarily, and the patient assesses whether sufficient pain relief is achieved — generally defined as a reduction of more than 50% in pain intensity. Permanent implantation only proceeds if the trial is successful.

Permanent Implantation

If the trial phase is successful, a pulse generator (similar to a cardiac pacemaker) is implanted under the skin, usually in the abdominal or buttock area. It is connected via thin leads to the electrodes positioned within the spinal canal. Patients can control stimulation settings using an external remote control, allowing them to adjust therapy to suit their individual needs.

Stimulation Modalities

Modern SCS systems offer several stimulation modes:

Conventional (paresthesia-based) stimulation: The patient perceives a tingling sensation (paresthesia) in place of pain.
High-frequency stimulation (HF-SCS): High-frequency pulses delivered without perceptible paresthesia.
Burst stimulation: Clusters of impulses that mimic natural nerve firing patterns and are often better tolerated.
Dorsal root ganglion stimulation (DRGS): Targeted stimulation of individual nerve roots for more precise pain coverage.

Benefits and Risks

Benefits

Reversible procedure — the system can be removed at any time
Significant reduction in the need for pain medications
Improved quality of life and physical mobility
Adjustable to individual pain patterns

Risks and Side Effects

Infection at the implantation site
Electrode migration (displacement of the lead)
Device malfunction or battery depletion
Rarely: neurological complications such as numbness or muscle weakness
Potential incompatibility with certain imaging procedures (e.g., MRI restrictions depending on system type)

Patient Selection and Contraindications

Careful patient selection by an interdisciplinary team — including pain specialists, neurologists, and psychologists — is essential. Contraindications include active infections, coagulation disorders, certain psychiatric conditions, and situations where conservative treatment options have not yet been fully explored.

References

Deer TR et al. - The Neuromodulation Appropriateness Consensus Committee (NACC) Recommendations for Spinal Cord Stimulation: Guidance on Patient Selection, Programming and Outcome Measurement. Neuromodulation, 2017.
Mekhail NA et al. - Retrospective Review of 707 Cases of Spinal Cord Stimulation. Pain Practice, 2011.
National Institute for Health and Care Excellence (NICE) - Spinal cord stimulation for chronic pain of neuropathic or ischaemic origin. NICE Technology Appraisal Guidance TA159, 2008 (reviewed 2021).

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