What is avascular necrosis? Avascular necrosis is a disease that results from the temporary or permanent loss of blood supply to the bone. When blood supply is cut off, the bone tissue dies and the bone collapses. If avascular necrosis happens near a joint, the joint surface may collapse. This condition may happen in any bone.
1 For fallen police officers. 2  In the US, a blue ribbon is a symbol for remembrance for fallen members of local police services. 3  The ribbons are displayed by the survivors of fallen police officers and are very symbolic of the COPS organization, Concerns Of Police Survivors. A blue ribbon is also the ribbon used for awareness for the disease of neurofibromatosis. 2  A blue ribbon is also the ribbon used for awareness for the autoimmune disease of Sjoegren'sjÃ¶gren s. 3  Syndrome-anti smoke.  campaigns
Grey Ribbon : Meaning: This color is a symbol of diabetes, asthma, and brain cancer. Silver Ribbon : Meaning: This color is a symbol for children with disabilities, Parkinson's disease, and mental illnesses such as severe depression, bipolar disorder, schizophrenia, and anxiety disorders.