Fig. 2From: 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-upL2–L3 transforaminal full-endoscopic lumbar discectomy (TELD) for L2–L3 high-grade upward migration disc at zone 1. a Preoperative magnetic resonance imaging (MRI) lateral view showing an L2–L3 high-grade upward-migrated disc. b Intraoperative endoscopic view showing the L3 traversing root and epidural space. c The use of a flexible probe tip to pull out the migrated disc near zone 1 of the L2 vertebra. d Removed blue-stained migrated disc fragmentBack to article page