Single-Lens Reconstructed Three-Dimensional Versus Two-Dimensional Visualization in Uniportal Full-Endoscopic Unilateral Laminotomy with Bilateral Decompression for Lumbar Spinal Stenosis: A Retrospective Comparative Study

Background

Full-endoscopic unilateral laminotomy with bilateral decompression (ULBD) through a single portal lacks stereopsis, which dual-lens three-dimensional (3D) endoscopes cannot supply. This study evaluated whether a single-lens 3D reconstructed system shortens key operative steps, whether the benefit is greater with segmental deformity, and whether 12-month outcomes differ.