Osseogenesis refers to bone formation with no indication of cellular origin.When new bone is formed on or about a graft, it may  be either of graft origin (i.e., from cells that survive the transfer and are capable of forming bone) or from cells of host origin. Surface cells on cortical and cancellous grafts that are properly handled can survive and produce new bone. This early bone formed byviable graft cells is often critical in callus formation during the first 4 to 8 weeks after surgery. Cancellous bone, with its large surface area covered by quiescent lining cells or active osteoblasts, obviously has the potential for more graft-origin new bone formation than does cortical bone.

BONE GRAFT FUNCTION