The osteochondroses, also called Epiphyseal Ischemic Necrosis, are a relatively common group of orthopedic disorders of children, which are poorly understood. In an osteochondrosis, the epiphysis (growing end) of a bone dies and then is gradually replaced over a period of years, resulting in abnormal bone growth and deformity. The immediate cause of bone death is loss of blood supply, but why this occurs remains unclear.