Fig. 8From: Three-dimensional reduction method with a modified C2 isthmus screw in irreducible atlantoaxial dislocation: a technical noteA 24-year-old man with Os odontoideum. aāc Preoperative X-ray and CT scan showed Os odontoideum and atlantoaxial dislocation. d Preoperative MRI showed spinal cord compression. e Intraoperative X-ray showed the position of C1 PS combined with modified C2 isthmus screw and f reduction. g Postoperative anteriorāposterior X-ray, and hāj Postoperative CT scan showed good reduction and position of modified C2 isthmus screw. PS pedicle screwBack to article page