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A vascular necrosis (AVN) is defined as cellular death of bone components
due to interruption of the blood supply; the bone structures then collapse,
resulting in bone destruction, pain, and loss of joint function. AVN is
associated with numerous conditions and usually involves the epiphysis of long
bones, such as the femoral head. In clinical practice, AVN is most commonly
encountered in the hip. Early diagnosis and appropriate intervention can delay the need
for joint replacement. However, most patients present late in the disease course. Without
treatment, the process is almost always progressive, leading to joint destruction within 5
years. Treatment of a vascular necrosis depends mainly on early diagnosis which mainly
based on clinical
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