There are three steps in fracture healing:
1.Inflammation: Hematones appear at the site and forms hemotocytes. Granula tissue formation.
2. Repair: a).soft callus: At the site of fracture a cartilage forms which serves as a bridging bone.
b).hard callus: the callus is replaced by the immature bone.
3. Remodeling: The osteoblats forms the site and replaces the immature with the hard bone.