A spinal cord stimulator is implanted in two stages: first a temporary trial lasting about one to two weeks, then, if successful, a permanent implant. Both procedures involve threading thin wires called leads into the epidural space of the spine, where they deliver mild electrical pulses to interrupt pain signals before they reach the brain. The entire process from trial to permanent device typically spans several weeks.
The Trial Phase
Before committing to a permanent implant, you go through a trial period with temporary leads. This is an outpatient procedure done under local anesthesia. Your doctor inserts a needle between the vertebrae in your back, passing through several layers of ligament before reaching the epidural space, a narrow corridor between the outer membrane of the spinal cord and the inner wall of the spinal canal. Thin wire leads are threaded through the needle and positioned over the dorsal columns, the nerve pathways that carry sensory signals up the spine.
During the trial, the leads connect to an external battery you wear on a belt or clip to your clothing. Trial periods typically last 3 to 15 days. Each day, you evaluate whether the stimulation is meaningfully reducing your pain. The standard threshold for moving forward with a permanent implant is at least a 50% reduction in pain, along with improvements in quality of life and the ability to reduce pain medications. If the trial doesn’t meet that bar, the leads are simply removed in the office.
How the Leads Are Placed
There are two main techniques for placing the permanent leads, and they differ significantly in how invasive they are.
Percutaneous leads are the more common approach. A needle is inserted through the skin of your back, and the leads are guided into the epidural space using fluoroscopy (real-time X-ray imaging). This is done under local anesthesia, which is a major advantage: because you’re awake, your surgeon can turn on the stimulator during the procedure and ask you where you feel the tingling sensation. That real-time feedback lets the surgical team reposition the leads until the stimulation covers your specific pain area. Most leads end up in the mid-thoracic spine, typically between the T8 and T10 vertebrae, though the exact level depends on where your pain is located.
Surgical (paddle) leads require a small opening in the bone of the spine called a laminotomy. This is done under general anesthesia, meaning you’re fully asleep. The paddle-shaped lead is placed directly onto the surface of the epidural space. Because you’re unconscious, the surgeon relies on anatomical landmarks rather than your feedback to position the lead. Paddle leads have a broader contact surface and may anchor more securely, but the tradeoff is a more invasive procedure without the ability to confirm pain coverage in real time.
Implanting the Pulse Generator
Once the leads are in position, the surgeon creates a small pocket under the skin to hold the pulse generator, the battery-powered device that controls the electrical signals. This pocket is usually made in the upper buttock or the lower back area, through a separate small incision. The leads are tunneled under the skin to connect to the generator. The incision is closed with sutures, and the generator sits just beneath the skin surface, where it’s not visible but can sometimes be felt if you press on the area.
The entire permanent implant procedure generally takes one to two hours. Most people go home the same day or after one night in the hospital.
Programming the Device
After the permanent implant, the device is turned on and its settings are verified before you leave the facility. The initial settings typically match what worked during your trial period. You’ll receive a handheld remote that lets you adjust the stimulation intensity, turn the device on and off, and switch between programmed settings.
If you notice any loss of pain relief or unusual sensations after surgery, the device can be evaluated and reprogrammed by your pain management team or a representative from the device manufacturer. Fine-tuning often happens over several follow-up visits in the weeks after implantation as swelling resolves and the leads settle into their final position.
Recovery and Activity Restrictions
The most important thing during recovery is keeping the leads from shifting. It can take up to 12 weeks for the leads to fully scar into place in the epidural space, and movement during that window can cause them to migrate. Lead migration happens in roughly 1 out of every 10 patients, and when it occurs, it almost always requires a revision procedure to reposition or replace the leads.
During the healing period, you’ll need to follow specific restrictions:
- No lifting anything heavier than 5 pounds
- No raising your arms above your head
- No twisting, bending, or stretching at the waist
- No sudden movements of any kind
When getting in and out of bed, you’ll want to log roll (turning your whole body as a unit) rather than sitting up by twisting your torso. Bending should come from your knees, not your back. Your doctor will give you a specific timeline for when you can drive, return to work, and gradually resume normal activities. These restrictions feel inconvenient, but they directly protect your results. If the leads shift, reprogramming alone may not restore the pain coverage you had.
Who Qualifies for Implantation
Current consensus guidelines recommend that all candidates undergo psychological screening before being approved for a stimulator, specifically including an assessment for depression. Untreated psychological conditions can significantly affect how well the therapy works. A trial period is recommended before every permanent implant, with one exception: patients receiving stimulation for chest pain caused by angina may proceed directly to permanent implantation.
The screening process also typically includes confirming that more conservative treatments like physical therapy, medications, and injections have already been tried. Spinal cord stimulation is generally reserved for chronic neuropathic pain conditions, such as failed back surgery syndrome or complex regional pain syndrome, where other approaches haven’t provided adequate relief.