{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T04:13:36Z","timestamp":1769832816648,"version":"3.49.0"},"reference-count":30,"publisher":"The Korean Spinal Neurosurgery Society","issue":"4","license":[{"start":{"date-parts":[[2023,12,31]],"date-time":"2023-12-31T00:00:00Z","timestamp":1703980800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Ratchadapiseksompotch Fund, Graduate Affairs, Faculty of Medicine, Chulalongkorn University","award":["GA66\/039"],"award-info":[{"award-number":["GA66\/039"]}]}],"content-domain":{"domain":["e-neurospine.org"],"crossmark-restriction":true},"short-container-title":["Neurospine"],"published-print":{"date-parts":[[2023,12,31]]},"abstract":"<jats:p>Objective: We introduced a new preoperative method, the \u201cexpanded surgical corridor,\u201d to evaluate the actual safety corridor, which may expand the possibility of performing oblique lateral interbody fusion (OLIF).Methods: Axial T2-weighted magnetic resonance images at the L4\u20135 disc level of 511 lumbar degenerative disease patients was evaluated. The distance between the medial edge of the left-sided psoas muscle and the major artery was measured as the conventional surgical corridor (CSc). The distance between the major vein and lumbar plexus was measured as the expanded surgical corridor (ESc).Results: The mean CSc and ESc were 13.9 \u00b1 8.20 and 37.43 \u00b1 10.1 mm, respectively. No surgical corridor was found in 7.05% of CSc and 1.76% of ESc, small corridor ( \u2264 1 cm) was found in 27.40% of CSc and 0.59% of ESc, moderate corridor (1\u20132 cm) was found in 42.07% of CSc and 1.96% of ESc, and large corridor ( &gt; 2 cm) was found in 23.48% of CSc and 95.69% of ESc. A total of 33.83% (45 of 133) of whom were preoperatively categorized as having a limited surgical corridor by conventional measurement, underwent OLIF L4\u20135 successfully.Conclusion: By using the ESc, only 2.35% were categorized as having a limited surgical corridor. The other 97.65% of the patients had an approachable corridor that could be successfully operated by experienced spine surgeons who employ meticulous surgical dissection and thorough understanding of the anatomical structures. The ESc may represent true accessibility to the disc space for OLIF, particularly at the L4\u20135 level.<\/jats:p>","DOI":"10.14245\/ns.2346678.339","type":"journal-article","created":{"date-parts":[[2023,12,27]],"date-time":"2023-12-27T23:32:11Z","timestamp":1703719931000},"page":"1450-1456","update-policy":"https:\/\/doi.org\/10.14245\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["An Expanded Surgical Corridor of Oblique Lateral Interbody Fusion at L4\u20135: A Magnetic Resonance Imaging 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