Cortical screw constructs have several touted advantages over traditional pedicle screw constructs.

First, the surgical exposure required for instrumentation placement is less than that required for traditional pedicle screw placement.

This reduced exposure can help reduce blood loss and other approach-related morbidity.

Second, the unique screw trajectory, along with a cortically threaded screw, allows for increased cortical bone purchase within the lamina and pedicle. This improved bone purchase can result in improved screw pullout strength, and possibly reduce the chance of screw loosening.

Finally, cortically placed screw heads rest on top of the vertebral lamina, which is significantly more medial than traditional pedicle screws, making them more accessible and rod placement more straightforward. ⁰¹