Efficacy of Percutaneous Spinal Endoscopic YESS Technique in Adjacent Segmental Disease Without Severe Instability After Lumbar Fusion Surgery: A Case Series.

In the short term, spinal endoscopic YESS technique markedly improves clinical symptoms and gait parameters in patients with ASD without severe instability after lumbar fusion, while avoiding facet joint destruction and intervertebral height loss. Future studies with larger sample sizes and longer follow-up times are needed to clarify the long-term efficacy.