Final answer:
A large cortical allograft is osteoconductive, providing a scaffold for new bone growth.
Step-by-step explanation:
A large cortical allograft is osteoconductive. Cortical bone tissue is smooth and dense, making up the outer layer of bones. Osteoconductive materials provide a scaffold for new bone growth, allowing bone-forming cells to migrate and attach to the surface of the graft. Therefore, a large cortical allograft facilitates bone regeneration by providing a framework for new bone to grow.