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a Case 9: a 54-year-old man during atlanto-axial fixation. The reference frame is placed on the C2 spinous process and a navigatable guide is inserted, in an incision separate from that of the reference frame. b Lateral view from image intensifier during surgery. c Magerl’s and Brooks’ procedures were performed using SecureStrand sublaminar cables. d Main skin incision and two small incisions
