| Front | Repair process of bone |
|---|---|
| Back | • Bleeding occurs due to rupture of blood vessels • A clot (haematoma) is formed • Due to lack of nutrition, bone cells die • There is pain and inflammation • Capillaries grow into the clot • Phagocytic cells enter and begin to clean the debris • Due to the rupture of Periosteum, osteoblasts are released • Osteoblasts and Fibroblasts begin to secrete the callus • Within 3-4 weeks, the blood clot is replaced by the soft callus (Fibrocartilaginous callus). • Ossification of callus occurs and it is gradually converted into a hard callus of *spongy bone* • Osteoclasts break the cartilage and osteoblasts replace it with bone • By the end of 2 months, a firm union has been formed (spongy bone). REMODELLING: • After several months, the compact bone is formed in which *osteons* extend across the fracture line • The excess bone material is removed from the sides |
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