When people think about implanted devices for chronic pain, they usually picture spinal cord stimulators that reduce pain by changing how signals travel to the brain. Reactiv8 works differently. Instead of suppressing pain signals, it targets the physical cause of certain types of chronic low back pain by stimulating a muscle.
The multifidus is a deep muscle that runs along the spine. In people with chronic low back pain, it often atrophies and stops functioning correctly. Studies have shown that even after back pain resolves, this muscle frequently does not fully recover on its own. Physical therapy helps, but for many patients, the multifidus remains too weakened and poorly coordinated to stabilize the spine the way it should. This is now understood to be a significant factor in why some people experience persistent low back pain even when imaging does not show an obvious structural problem.
Reactiv8 is a restorative neurostimulation device that delivers electrical stimulation to the nerves controlling the multifidus during brief daily sessions. The stimulation causes the muscle to contract, essentially training it and rebuilding its function over time. This does not require surgery on the disc or the joint. It addresses the muscle system that supports the spine.
Why the Multifidus Matters So Much
The multifidus is the primary stabilizer of the lumbar spine. Unlike larger back muscles that move the torso, the multifidus is designed to hold the vertebrae in alignment during everyday movement. When it functions well, it reduces strain on the discs, joints, and ligaments of the lower back.
Research has shown that people with chronic low back pain show measurable changes in the multifidus, including reduced muscle size, increased fat infiltration, and impaired activation patterns. These changes do not necessarily reverse on their own. They can persist for years and contribute to a cycle where pain leads to guarding, guarding leads to disuse, and disuse leads to further muscle deterioration.
Standard core strengthening exercises are useful, but they often do not isolate the multifidus well enough to produce reliable recovery, particularly in patients who have had significant pain for a long time. Reactiv8 targets the exact nerve branches that control the multifidus, creating a more direct and consistent retraining effect.
How the Device Works
The Reactiv8 system consists of a small implantable pulse generator placed below the skin and two leads positioned bilaterally at the medial branches of the lumbar dorsal rami, which are the nerves controlling the multifidus. The device is implanted in an outpatient procedure.
Once activated, the system delivers two daily stimulation sessions, each lasting thirty minutes, during which the multifidus contracts rhythmically. Most patients use the device while resting, typically before getting out of bed in the morning and again in the evening. Over several months, the muscle begins to function better, and many patients notice a gradual reduction in chronic low back pain and improved tolerance for daily activity.
This is a fundamentally different mechanism from traditional spinal cord stimulation. Rather than masking pain signals, Reactiv8 targets the physical dysfunction that contributes to ongoing pain. Patients who respond well often report that their back feels more stable and that they can do more without triggering flare-ups.
Who Is a Candidate for Reactiv8
Reactiv8 is appropriate for a specific subset of patients with chronic low back pain. Typical criteria include:
Chronic low back pain lasting at least six months
Pain that has not responded adequately to conservative care, including physical therapy
Axial low back pain without a dominant radicular component, meaning no significant leg pain from spinal nerve compression
Absence of conditions requiring urgent surgical intervention
Intact motor function and sensation in the legs
This is not a first-line treatment. It is generally considered after a patient has worked through appropriate conservative care without enough improvement. It is particularly relevant for patients who have axial pain without a clear structural cause on imaging, or who have pain that persists despite prior treatment.
What to Expect From Treatment
There is no trial period with Reactiv8. If you meet the criteria you can proceed to permanent placment.
Improvements from Reactiv8 tend to be gradual. Unlike a corticosteroid injection that may reduce pain within days, restorative neurostimulation works by rebuilding muscle function over time. Most patients see meaningful improvement within three to six months of consistent use. Follow-up with our team is part of the process to monitor progress and make adjustments as needed.
Patients across Nassau County and the greater Long Island area who have been dealing with axial low back pain for years without finding a lasting solution may find that Reactiv8 offers a different and more targeted path forward.
Frequently Asked Questions About Reactiv8
Is Reactiv8 covered by insurance?
Coverage is expanding as more clinical data becomes available. Our team will check your specific plan during the evaluation process and discuss out-of-pocket costs if applicable.
Is this the same as a spinal cord stimulator?
No. Reactiv8 stimulates the nerves that control the multifidus muscle, not the spinal cord. The goal is muscle rehabilitation, not pain signal suppression. The two devices work through entirely different mechanisms and are appropriate for different patient profiles.
How long does recovery take after implant?
The implant procedure itself is outpatient and recovery is typically brief. The therapeutic benefit from muscle retraining develops over several months.
Can I still use other treatments alongside Reactiv8?
Yes. Many patients continue physical therapy or use other supportive treatments alongside the device.
Explore Your Options for Chronic Low Back Pain on Long Island
If you have been dealing with persistent low back pain and feel like you have tried everything, Reactiv8 may be a treatment worth discussing. Dr. Rubin sees patients at our Garden City and New Hyde Park offices and serves the greater Nassau County and Queens area. Call 516-492-3100 or text 516-206-0774 to schedule a consultation.
Written by Dr. Edward Rubin, MD, board-certified in Pain Medicine and Anesthesiology, with fellowship training at Cornell, Columbia, Hospital for Special Surgery, and Memorial Sloan Kettering. Dr. Rubin has been treating chronic pain patients on Long Island for over 20 years.
