Functional Outcomes of Full-endoscopic Spine Surgery for High-grade Migrated Lumbar Disc Herniation: A Prospective Registry-based Cohort Study with More than 5 years of Follow-up

BMC Musculoskelet Disord

FELD has a high success rate for the management of high-grade migrated herniated discs. In patients with high-grade disc migration from L1 to L5, TELD is effective and safe. However, for L4–L5 and L5–S1 high-grade upward and downward disc migration, IELD is the favorable option and provides high patient satisfaction.