416 patients were randomized to receive either the Superion or X-STOP interspinous systems in minimally invasive surgery for symptomatic treatment of lumbar spinal stenosis. The objective of the study was to determine if there was a difference in clinical outcomes of the two devices at 12 months of a 5 year trial. The results at 1 year follow-up indicated that both treatment devices significantly improved clinical outcome compared to preoperative values, and that there was no difference between groups at any follow-up assessment. Rate of re-operation also did not significantly differ between groups. Future assessment in this study will determine if any differences exist between the two interspinous systems.