Difference between revisions of "Osteosis"
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(Created page with "*Also called '''Aseptic necrosis''' or '''Ischaemic necrosis''' *Degeneration and necrosis of osseous tissue *Due to bone marrow pressure and ischaemia resulting from **[[Bones ...") |
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**[[Bones Fractures - Pathology|Fractures]] | **[[Bones Fractures - Pathology|Fractures]] | ||
**Excessive heat e.g. horn disbudding | **Excessive heat e.g. horn disbudding | ||
| − | **Neoplasia ([[ | + | **Neoplasia ([[Osteosarcoma|osteosarcoma]] and [[Lymphosarcoma|lymphosarcoma]]) |
*Grossly: | *Grossly: | ||
**Necrotic bone difficult to recognise | **Necrotic bone difficult to recognise | ||
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*Persists | *Persists | ||
*May not be detected radiographically | *May not be detected radiographically | ||
| − | *Associated with [[ | + | *Associated with [[Calve Legg-Perthe's Disease|Calve-Legg Perthe's disease]] |
[[Category:Bones - Degenerative Pathology]] | [[Category:Bones - Degenerative Pathology]] | ||
Latest revision as of 16:04, 3 March 2011
- Also called Aseptic necrosis or Ischaemic necrosis
- Degeneration and necrosis of osseous tissue
- Due to bone marrow pressure and ischaemia resulting from
- Fractures
- Excessive heat e.g. horn disbudding
- Neoplasia (osteosarcoma and lymphosarcoma)
- Grossly:
- Necrotic bone difficult to recognise
- Sometimes, periosteum becomes dry, dull and detaches easily
- On longitudinal section
- Yellow-white necrotic bone
- Scattered cancellous and endosteal bone
- Histologically:
- Empty lacunae or contain dead osteocytes
- Matrix remains mineralised
- Necrotic bone is slowly resorbed, sequstered or covered by new woven bone
- Persists
- May not be detected radiographically
- Associated with Calve-Legg Perthe's disease