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*Subchondral [[necrosis]] of bone - '''key feature'''. | *Subchondral [[necrosis]] of bone - '''key feature'''. | ||
**Loss of osteocytes within the bony trabeculae. | **Loss of osteocytes within the bony trabeculae. | ||
*Bone marrow cavity fibrosis with loss of adipocytes (reactive process). | *Reactive woven bone: | ||
**Thickened trabeculae. | |||
**Increased numbers of osteoblasts and osteoclasts. | |||
*Bone marrow cavity fibrosis with small blood vessels and loss of adipocytes (reactive process). | |||
Note: | Note: |
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