<unk>  is a degenerative change to bone marrow caused primarily by loss of circulation to the bone tissue (ischaemia). These changes can be caused by toxic insult, thrombosis, neoplasia or DIC (disseminated intravascular coagulation).
Myelonecrosis
Acroosteolysis
Osteolysis
Discitis
Osteomyelitis
Spondylopathy
Spondylolysis
Osteoradionecrosis