Correlation Between Clinical Improvement and Dural Sac Cross-Sectional Area Expansion in Biportal Endoscopic Lumbar Decompression

UBE decompression showed good clinical outcomes similar to previous studies, and the CSA of ​​the dural sac on MRI significantly increased in the late postoperative phase compared with the early postoperative phase. This technique is viable option to achieve radiographic dural expansion and improvement in clinical outcomes in degenerative lumbar spinal stenosis. However, there is at best only a moderate correlation with change in CSA and clinical outcomes.