Avascular necrosis is the death of bone tissue due to a lack of blood supply. Also called osteonecrosis, avascular necrosis can lead to tiny breaks in the bone and the bone's eventual collapse. The blood flow to a section of bone can be interrupted if the bone is fractured or the joint becomes dislocated.Avascular necrosis typically causes no symptoms; however, as the disease progresses it becomes painful.
At first, you may experience pain when you put pressure on the affected bone. Then, pain may become more constant. If the disease progresses and the bone and surrounding joint collapse, you may experience severe pain that interferes with your ability to use your joint. The time between the first symptoms and collapse of the bone may range from several months to more than a year. If avascular necrosis is caught early, treatment may involve taking medications to relieve pain or limiting the use of the affected area.
If your hip, knee, or ankle is affected, crutches may be necessary to take weight off the damaged joint. Your doctor may also recommend range of motion exercises to help keep the affected joint mobile. It is also associated with Osteoarthritis and Knee injuries. "According to some study in Israeil, The telephone applied CCQ had a sensitivity level of 88.6% and specificity of 70.0% when compared with the rheumatologist evaluation (k=0.576) (P <0.001). A lower prevalence of rheumatic complaints was found in the summer months (17.7%) than in winter months (26.2%, P < 0.01).
Prevalence was related to country of origin (0.008 < P< 0.03) (P range in separate surveys) and increasing age (P < 0.001) and was higher in women than in men (0.003 < P < 0.043). Body sites most affected were the lower back (63%) and the knees (47%). Medically related unemployment was more common in those with rheumatic complaints (7.9%) than in those without such complaints (2.9%, P<0.01). Among those with rheumatic ailments, 12.7% had a related discapacity recognized by the Israeli National Insurance Institute. According to a statistical analysis there are Extrapolated Incidence of Avascular Necrosis is 227 in Israeil."