The Interspinous Spacer: A New Posterior Dynamic Stabilization Concept for Prevention of Adjacent Segment Disease

Figure 2

Above preoperative spine X-ray with previous instrumented level on the right. On the left, degenerated segments at L1-L2 and L2-L3 levels. Below preoperative view showing the extended fusion from L1 to S1 with Th12-L1 interspinous spacer.