Avascular necrosis (AVN) is a medical condition in which, due to various causes, the blood supply to the head of a bone joint reduces drastically, causing the density of bone in the joint to degrade, resulting in collapse of the joint bone-head. This causes symptoms such as pain, stiffness, and inability to squat or sit cross-legged. Although AVN is most commonly seen affecting the hip joint, other joints like the shoulder too may be involved. Excessive or prolonged use of steroids and alcohol; trauma; and some diseases like autoimmune disorders and chronic blood disorders, are known to cause this condition.
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