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Laminectomy while protecting the dura. (A, B) Preserving the deep layer of LF until finishing the laminectomy. Contralateral side laminectomy (A) and distal laminectomy (B) were performed with protection of dura by deep layer of LF (*). (C) When the deep layer of LF was detached fully, a Cottonoid covering the dura was inserted under the proximal lamina (★). (D) Burring could be permitted after protection of the dura with Cottonoid carpet (★). LF, ligamentum flavum.
