Actual picture and diagrammatic illustrations of the fixation system. A) The built-in expandable anterior spinal fixation system. B) Diagrammatic illustrations of the fixation system. 1) Exterior view 2) lateral interior view (without insert); 3) insert; 4) with insert placed to expand the screw. After the insert is placed to expand the screw, the diameter of the expanded tip is 9.0 mm inside the vertebral body.