Dead bone is caused by the cessation of local metabolism of bone tissue. This disease first destroys the blood supply of neighboring joint surface tissues, and then causes necrosis. Dead bone in the early stage of a very strong hidden, so the harm to the human body is great, many patients are not timely detection of symptoms, missed the best period of treatment of the disease, which requires us to understand the symptoms of dead bone in a timely manner, according to these performances to check whether they suffer from the risk of dead bone. Dead bone self-check methods are: 1, hip pain knee pain: early dead bone will generally have hip or knee pain, but it is easy to be misdiagnosed as arthritis or joint injury, in fact, it is the associated radiating symptoms of dead bone. This kind of pain can be obvious due to exertion, trauma, heavy drinking, excessive activities, up and down stairs and other triggers. 2, gait abnormality: the main symptom is claudication, claudication is due to the patient’s hip pain, bone collapse and deformation, pelvis also appeared Section tilt, may also be due to the phenomenon of head and tail of the hip joints, in the early stage of the dead bone is generally an intermittent claudication, after resting will be no more, and after the activity will appear again, to the middle and late stage will be a persistent claudication. This is one of the more common manifestations of dead bones. 3, muscle atrophy disease: if the patient occurs dead bone, there will be some other signs and symptoms of performance, muscle atrophy also began to appear, it is the capacity of our muscles and the expansion of the ability to down frame, usually appear in the buttock muscles, calf muscles and thigh muscles and so on.