Avascular Necrosis of the Hip: Avascular necrosis means bone death due to a lack of blood supply. A disrupted blood supply occurs when there is a fracture, dislocation, or repetitive trauma to the neck of the femur. Signs and symptoms include pain, limitation of movement and pain with walking. X-rays, MRI, or a bone scan may be helpful in diagnosing this disorder. Surgical decompression or total hip replacement may be necessary.