For dead bone disease is often easy to confuse with some orthopedic diseases, so many times the diagnosis of dead bone is very critical, but many people have misunderstandings about the diagnosis of dead bone, the following are several common methods of diagnosing dead bone: 1, for the high-risk groups of dead bone need to be vigilant, where adults aged 20-50 years, the diagnosis of dead bone has inguinal or hip pain, and dispersion to the thigh (or one side of the knee pain (or hip pain after activity), slowly progressive aggravation, obvious pain at night, ineffective by general medication, and a history of trauma or alcohol abuse or hormone application or other triggers and diseases that cause dead bone should be considered first. 2, all patients with low back pain should be routinely checked for hip function during physical examination, and the existence of this disease should be suspected if abduction and internal rotation of the affected hip is found to be limited. 3, The diagnosis of dead bone includes if the patient has hip pain (soreness, hidden pain), which can involve the groin, the front inner thigh, and the front of the knee, aggravated by activity, limp, limited activity, and weakness of the lower limbs, the patient needs to be alert to dead bone.