Consecutive Case Series of Uniportal Full‐endoscopic Unilateral Laminotomy for Bilateral Decompression in Lumbar Spinal Stenosis: Relationship between Decompression Range and Functional Outcomes

Objective Uniportal full‐endoscopic unilateral laminotomy for bilateral decompression (UFE‐ULBD) has been used to treat lumbar spinal stenosis (LSS) with satisfactory outcomes. However, a limited number of studies have investigated the relationship between decompression range and clinical outcomes. This study aimed to investigate the efficacy of UFE‐ULBD for single‐segment LSS and to explore the relationship between the decompression range and functional outcomes. Methods Single‐segment LSS patients who had undergone UFE‐ULBD using an interlaminar approach between November 2021 and February 2023 were retrospectively analyzed. Patient demographics, visual analogue scale (VAS) scores for leg and back pain, Oswestry disability index (ODI) scores, modified MacNab grades, and radiological outcomes, including the decompression ratio of the disc‐flava ligament space and osseous lateral recess, the enlargement ratio of superior articular process interval, lamina interval dural sac cross‐sectional area (DSCA), were collected. The independent sample t‐tests, paired sample t‐tests, chi‐square tests, Fisher's exact tests, and Pearson's and Spearman's correlation analyses were used. Results Forty patients (23 males, and 17 females) were retrospectively enrolled in this study. The mean follow‐up period was 12 months. At the last follow‐up, VAS scores for leg pain and back pain decreased from 6.0 ± 0.8 to 1.0 ± 1.9 (p