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In page Avascular necrosis:
"Upon reperfusion, repair of bone occurs in 2 phases. First, there is angiogenesis and movement of undifferentiated mesenchymal cells from adjacent living bone tissue grow into the dead marrow spaces, as well as entry of macrophages that degrade dead cellular and fat debris.[1] Second, there is cellular differentiation of mesenchymal cells into osteoblasts or fibroblasts.[1] Under favorable conditions, the remaining inorganic mineral volume forms a framework for establishment of new, fully functional bone tissue.[1]
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