<unk>  is a disease resulting from the temporary or permanent loss of the blood supply to the bones. Without blood, the bone tissue dies and causes the bone to collapse. If the process involves the bones near a joint, it often leads to collapse of the joint surface. This disease also is known as osteonecrosis, aseptic (bone)<unk> , and ischemic bone<unk> .
Avascular necrosis
Fracture nonunion
Acral necrosis
Bone infarction
Osteopetrosis
Occult fracture
Osteochondrosis
Aneurysmal bone cyst