Osteonecrosis occurring at the metaphysis or diaphysis is known as?

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The key idea is naming bone death due to loss of blood supply based on where it occurs. When ischemic death of bone tissue happens in the metaphysis or the diaphysis of a long bone, this specific finding is called a bone infarct. The term bone infarct emphasizes infarction within the medullary (diaphyseal/metaphyseal) bone, rather than the joint surface. Avascular necrosis or osteonecrosis describe the same general process of bone tissue death from ischemia, but they’re not location-specific in this context and are often used for joints like the femoral head. Osteoarthritis, by comparison, is a degenerative joint disease unrelated to bone infarction.