Figure 2From: Biomechanical testing of a unique built-in expandable anterior spinal internal fixation system 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.Back to article page