If the infection isn't treated properly or quickly enough, part of the bone can die. The infection can become more serious and may go on for several months or even years. This is called chronic osteomyelitis. A chronic illness is one that lasts a long time, sometimes for the rest of the affected person's life. Chronic osteomyelitis may cause flare-ups of symptoms, e. g pain and fever, many years after the initial infection. When an infection lasts for such a long time, it can cause severe damage and possible deformity of your bones.
Attribution: BUPA