List and explain the steps in the repair process of a simple fracture

1. Hematoma formation- mass of clotted blood at fracture site.
Tissue in fracture site swells, very painful, obvious inflamation, and bone cells are dying.

2. Fibrocartilaginous callus developes over a 3 to 4 week period.
This process involves

-capillary growth in the hematoma
-phagocytic cells invading and cleaning-up debri in injury site
-fibroblasts and osteoblasts migrating into site and beginning
reconstruction of bone

Note that the fibrocartilaginous callus serves to splint the fracture.

3. Bony callus begins forming after 3 to 4 weeks after injury and is prominent 2 to 3 months following the injury. Continued migration and multiplying of osteoblasts and osteocytes results in the fibrocartilaginous callus turning into a bony callus.

4. Remoldeling. Any excess material of the bony callus is removed and compact bone is laid down in order to reconstruct the shaft. Remoldeling is the final stage.