Difference between revisions of "Osteosis"
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Line 17: | Line 17: | ||
*Persists | *Persists | ||
*May not be detected radiographically | *May not be detected radiographically | ||
− | *Associated with [[Calve Legg-Perthe's | + | *Associated with [[Joints Degenerative - Pathology#Calve Legg-Perthe's disease|Calve-Legg Perthe's disease]] |
[[Category:Bones - Degenerative Pathology]] | [[Category:Bones - Degenerative Pathology]] |
Revision as of 13:25, 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