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Multifidus Restorative Neurostimulation (ReActiv8)

Overview

What is ReActiv8?

Multifidus restorative neurostimulation, commonly known as ReActiv8 therapy, is an innovative procedure for patients with chronic lower back pain linked to dysfunction of the multifidus muscle—the deep stabilising muscle of the lumbar spine. This implantable neurostimulator helps restore neuromuscular control and reduce pain by stimulating the medial branch nerves that activate the multifidus muscle.​

Who is it for?

If you experience persistent mechanical low back pain for more than 6 months—unresponsive to physiotherapy, medications, or injections—and diagnostic tests confirm multifidus muscle dysfunction, you may be a candidate for ReActiv8.​

This treatment is suitable for people who have:

  • Chronic mechanical low back pain
  • Confirmed multifidus muscle dysfunction
  • Poor response to conservative management and standard therapies
  • No clear treatable cause on imaging (such as large disc herniation, fracture, or tumour)

What the Procedure Involves

Here’s what happens during implantation:

  • The device is implanted under the skin in the lower back or upper buttock, typically under local or general anaesthesia
  • Specialised leads (thin wires) are positioned near the nerves that control the multifidus muscle, using fluoroscopic guidance for accuracy​
  • Leads are anchored in place, and a small generator (battery) is connected and housed under the skin​
  • The incision is small, aiming for minimal scarring and disruption
  • The system is programmed at a follow-up visit, about 10–14 days after surgery, to enable twice-daily 30-minute therapy sessions.​
  • Sessions comfortably stimulate the muscle in a way that feels like a deep tissue massage and can be performed while resting

Risks and Complications

While the ReActiv8 procedure is generally safe, risks may include:​

  • Infection or bleeding at the implant site
  • Nerve or muscular injury
  • Lead or generator movement/dislocation
  • Allergic reaction or tissue irritation
  • Discomfort at the implant site or from stimulation
  • Device malfunction, need for reprogramming or revision
  • Rarely, undesired stimulation or muscle fatigue
    Most risks are uncommon and carefully managed with safe surgical technique and patient monitoring.

Recovery Expectations and Duration

Recovery from ReActiv8 is typically straightforward, patients can expect:

  • Mild discomfort for several days at the incision site, but most resume gentle activities quickly​
  • Device is switched on and programmed about 1–2 weeks after surgery
  • Twice-daily therapy sessions begin, performed at home using a remote control​
  • Most patients report functional improvement between 6 and 16 weeks; pain relief often follows as muscle control improves​
  • Full recovery, with lasting improvements in pain, function, and quality of life, typically occurs over several months. Long-term studies report durable benefits for many patients​
  • Patients may reduce or eliminate opioid use over time as results accrue​
  • Physical therapy may be encouraged in conjunction with the device for best outcomes

FAQs

Will I feel the stimulation during therapy sessions?
Most people experience a comfortable sensation, often similar to a deep tissue massage, with the muscle gently contracting and relaxing.​

How soon will I feel improvement?
Functional improvements may begin in 6–16 weeks, with pain relief often noticed as the multifidus regains normal activity. Improvements can continue for months and are durable in most patients.​

Can I have spine surgery later if needed?
Yes, the device does not alter your anatomy and can be removed or deactivated if further spine surgery is required.​