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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 ..."
*Also called '''Aseptic necrosis''' or '''Ischaemic necrosis'''
*Degeneration and necrosis of osseous tissue
*Due to bone marrow pressure and ischaemia resulting from
**[[Bones Fractures - Pathology|Fractures]]
**Excessive heat e.g. horn disbudding
**Neoplasia ([[Bones Hyperplastic and Neoplastic - Pathology#Osteosarcoma|osteosarcoma]] and [[Bones Hyperplastic and Neoplastic - Pathology#Lymphosarcoma|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 [[Bones - Anatomy & Physiology|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 [[Joints Degenerative - Pathology#Calve Legg-Perthe's disease|Calve-Legg Perthe's disease]]
[[Category:Bones - Degenerative Pathology]]
*Degeneration and necrosis of osseous tissue
*Due to bone marrow pressure and ischaemia resulting from
**[[Bones Fractures - Pathology|Fractures]]
**Excessive heat e.g. horn disbudding
**Neoplasia ([[Bones Hyperplastic and Neoplastic - Pathology#Osteosarcoma|osteosarcoma]] and [[Bones Hyperplastic and Neoplastic - Pathology#Lymphosarcoma|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 [[Bones - Anatomy & Physiology|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 [[Joints Degenerative - Pathology#Calve Legg-Perthe's disease|Calve-Legg Perthe's disease]]
[[Category:Bones - Degenerative Pathology]]