- M:F=1:1
- PREDISPOSING FACTORS– Tauma, Dislocation, Steroid, Haemoglobinopathies
- Onset– Gradual
- Course– Progressive
- X-ray– Increased bone density
- Bone Scan– Decreased activity
- MRI– Focal changes
- Histopathology– Marrow necrosis & Bone necrosis
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- M>F
- Unknown
- Acute
- Self-remitting
- Demineralization of Head & neck
- Increased activity
- Diffuse changes
- Marrow oedema with Minimal Bone necrosis
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