Fig. 2From: A new tool in percutaneous anterior odontoid screw fixationWork steps of our guide instrument. a The guide instrument (guide tube and protection tube) was placed at the desired entry point; b The guide wire was advanced to the posterior superior tip of the odontoid across the fracture line; c The drill bit was advanced to the posterior superior tip of the odontoid along the guide wire; d The tap was advanced along the guide wire to enlarge the trajectory; e the proper cannulated screw was advanced to the posterior superior tip of the odontoid along the guide wire and the apical cortical bone of the odontoid was penetrated; f The guide wire and the protection tube were removedBack to article page