Bone Callous Formation
How it happens:
- Bone is living tissue that is continually broken down and rebuilt throughout a persons life.
- Bone callous formation occurs when a bone is broken and repaired.
- If a bone is broken it is able to re-grow and bridge the line of fracture with new tissue.
- The repair mechanism is activated rapidly after injury but the actual full repair can take weeks
- Once mended a broken bone may take months to regain its former strength.
When a bone is fractured the healing process begins immediately:
from damaged vessels near the injury form a clot
around the bone, preventing further bleeding.
Within days, cells known as fibroblasts start to build up fibrous tissue at the site.
This tissue build up is the formation of bone callous.
This bridges the gap between the broken bone ends, replacing the blood clot.
After about two weeks, spongy bone is deposited on the callous, filling in the gap and keeping the bone ends stable.
The damaged blood vessels heal and grow across the break. This bone will gradually become harder as more spongy tissue is deposited.
After about three months new compacted bone has replaced the callous.
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Return from Bone Callous Formation to Skeletal System