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A Prospective, Multi-Center, Randomized Study Comparing the VertiFlex® Superion™ Interspinous Spacer (ISS) to the X-STOP® Interspinous Process Decompression (IPD®) device in healthy adults suffering from at least 6 months of moderate spinal stenosis symptoms who have been unresponsive to conservative care


Patients diagnosed with lumbar spinal stenosis may be eligible to participate in a clinical trial under the supervision of The University of Colorado Hospital spine surgeons.

The study examines the effectiveness of the SuperionTM Interspinous Spacer Device as a potential alterative to traditional spinal surgery. The device is designed to relieve leg, buttock and groin pain resulting from pressure on the spinal nerve roots.

The device is implanted through a small skin incision and may be less invasive than traditional spinal surgery, with a faster recovery time.

IRB Protocol Number

All Other Trials

  • Back, Neck, and Spine
The Spine Center at 720-848-1980
Eligibility and Other Participant Information


To qualify, participants must:

  • Be diagnosed with lumbar spinal stenosis
  • Have undergone non-operative treatment for unrelieved symptoms for at least 6 months
  • Be over 45 years of age
  • Have leg, buttock or groin pain that is relieved by sitting or bending forward
  • Not have a history of prior surgery to the lower spine

Other qualifications apply.