What it is
Spinal cord stimulation (SCS) uses thin leads placed in the epidural space — the space just outside the spinal cord's covering — to deliver mild electrical pulses that interfere with pain signal transmission. The leads connect to a small pulse generator implanted under the skin, similar in concept to a cardiac pacemaker. The patient can adjust the stimulation settings using an external controller.
Modern SCS devices offer a range of stimulation patterns beyond the traditional paresthesia-based approach: high-frequency stimulation (10 kHz) and burst stimulation can reduce or eliminate the tingling sensation while providing pain relief — improving the experience for many patients.
The trial first
A critical feature of SCS is the trial period. Before permanent implantation, leads are placed percutaneously and connected to an external generator worn outside the body for 5–7 days. The patient goes home and assesses pain relief in real life. If the trial provides meaningful improvement (typically defined as greater than 50% pain reduction), permanent implantation proceeds. If not, the leads are removed in the office with minimal intervention.
This trial-before-commit structure is one of SCS's important advantages — patients have direct experience with the therapy before any permanent hardware is placed.
Appropriate candidates
SCS is appropriate for patients with chronic, refractory neuropathic pain who have exhausted or are not candidates for further structural surgical correction. Psychological screening is standard before implantation to identify factors that predict better outcomes. Active infection, bleeding disorders, and certain implanted devices (some pacemakers, cochlear implants) are contraindications that must be evaluated individually.
What to expect
Permanent implantation is an outpatient or short-stay procedure. Restrictions on bending and reaching apply for several weeks to allow lead stabilization. Battery life varies by device and usage; rechargeable systems extend intervals between generator replacements.