Stages of bone repair
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step one
1. Hematoma forms (torn blood vessles, clot forms, site is swollen) and is converted to granulation tissue by invasion of cells and blood capillaries.
step two
2. Soft callus formation-Depostion of collagen and fibrocartilage converts granulation tissue to a soft callus.
step three
3. Hard callus formation- osteoblasts deposit a temporary bony collar around the fracture to unity the broken pieces while ossification occurs
step four
4. Bone remodeling- small bone fragments are removed by osteoclasts, while osteoblasts deposit spongy bone and then convert it to compact bone.
