<p>Bone screws are required for every procedure performed to keep the dissected bone connected. Screws go into the slots on each side of the cage which performs the role of bone spacer. The screws are then tightly fitted into the bone on each side making the two dissected bone parts inseparable by way of the bone spacer in the middle of them. Screws are also placed into the lower end of the TTA plate to keep it joined with the bone.</p>