Osteonecrosis is an illness brought about by decreased blood stream to bones in the joints. In individuals with sound bones, new bone is continually supplanting old bone. In osteonecrosis, the absence of blood makes the bone separate quicker than the body can make enough new bone. The bone begins to kick the bucket and may break down.You can have osteonecrosis in one or a few bones. It is generally regular in the upper leg. Other normal locales are your upper arm and your knees, shoulders and lower legs. The ailment can influence people of all ages, however it for the most part strikes in your thirties, forties or fifties.At first, you probably won't have any indications. As the malady deteriorates, you will most likely have joint torment that turns out to be increasingly extreme. You will most likely be unable to curve or move the influenced joint well overall. Specialists use imaging tests and different tests to analyze osteonecrosis. Medicines incorporate meds, utilizing braces, restricting exercises that put weight on the influenced joints, electrical incitement and medical procedure.