Effect of Pre-existing Adjacent Segment Degeneration on Long-term Effectiveness After Lumbar Fusion Surgery

This study looks at how pre-existing degeneration of the spinal segments adjacent to a lumbar fusion surgery affects long-term outcomes. When a surgeon fuses vertebrae in the lower back (lumbar spine), the discs and joints next to the fusion can sometimes wear out faster — a phenomenon called adjacent segment disease. This study evaluates whether the condition of those neighboring segments before surgery predicts problems years later. You may be eligible if... - You have a confirmed diagnosis of lumbar spinal stenosis requiring surgery at the L4-S1 level - You have tried conservative treatment (physical therapy, injections, etc.) for at least 8 weeks without relief You may NOT be eligible if... - You have instability (slippage, rotation, abnormal bending) in the segment adjacent to the planned fusion - You have significant spinal imbalance (sagittal or coronal) - You have a spinal infection or tumor - You have had previous lumbar fusion surgery Talk to your spine surgeon if you are being considered for lumbar fusion surgery and want to understand how your overall spinal health may affect long-term outcomes.