Avascular necrosis (AVN) is a condition that occurs when blood flow to a bone is disrupted, leading to the death of bone tissue. This can result from various factors, including injury, long-term use of corticosteroids, or excessive alcohol consumption. Commonly affected areas include the hip, knee, and shoulder joints. Symptoms of AVN may include joint pain, stiffness, and limited range of motion. As the condition progresses, the affected bone can collapse, leading to severe joint damage. Early diagnosis and treatment are crucial to prevent further complications and preserve joint function.