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(A) A overall view of operating table. The table was adjusted to make sure that the intervertebral space was perpendicular to the ground. (B) Schematic representation of the location of the portals; (C) Newly designed knotting system for endoscopic laminoplasty. Facia cannula (white arrow), working length 6 cm and inner diameter 0.5 cm; endoscopic knot pusher (blue arrow) and shears (black arrow), diameter 0.3 cm; (D) Trials (range, 8 mm–12 mm) for the measurement of LOS.
