Osteo Flashcards
1
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A
Osteonecrosis. The necrotic marrow is the most eye-catching feature (arrow), showing fat necrosis and an absence of marrow elements. On close examination, the osteocytes within lacunae are also dead or missing (arrowhead).
2
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Osteoarthritis. Features include (1) eroded cartilage, in this case nearly absent, and irregular mineralization of the cartilage, seen here as a dark purple stain; (2) thickening of the subchondral bony trabeculae; (3) myxoid degeneration of the subchondral bone, forming cyst-like spaces; and (4) some residual hematopoietic marrow.
