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(A) Incision of skin should be made just beside spinous process to save facet joint. (B–D) Skin incision with #10 surgical blade. A 7-mm skin incision (dotted line) enables the passage of 8-mm dilator and 9.5-mm working sleeve due to skin elasticity (solid line = spinous process). Skin marking or incision is placed directly above the lamina based on anteroposterior C-Arm x-ray projection.
