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Introduction: Avascular necrosis , also known as osteonecrosis , is a condition where cellular components of bone die due to an interruption in the subchondral blood supply. It typically affects the epiphysis of long bones at weight-bearing joints. This can lead to tiny fractures in the bone and eventual collapse. A pproximately 10,000 to 20,000 Americans develop avascular necrosis each year. This condition can affect people of all ages and genders, but it is most commonly observed in individuals in their 30s and 40s . Avascular necrosis can impact bone tissue in any joint, but it typically targets the hip . While physical therapy cannot cure avascular necrosis, it can play a crucial role in managing the disease and alleviating associated pain. Causes of Avascular Necrosis Several factors can cause avascular necrosis: Reduced Blood Supply : Interruption or reduction in blood flow to a bone can occur due to: Joint ...