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Intraoperative conditions of unilateral biportal endoscopy for decompression. (A) Initial camp; (B) Decompression of the ipsilateral traversing nerve root; (C) Decompression of the contralateral traversing nerve root; (D) Decompression of the contralateral foraminal. Ca, caudal sides; Cr, cranial sides; L, lateral; M, medial. LF, ipsilateral traversing nerve root; ▴, contralateral traversing nerve root; ●, contralateral exiting nerve root.
