Patient: Description of disease (onset time, main symptoms, hospitalization, etc.): My child has taken hormone treatment for his illness, and I would like to ask about the possibility of necrosis of the femoral head caused by hormone treatment in children. What is the percentage of such cases? (My child took 450mg of shock and 2000mg of oral prednisone for 7 months.) What is the relationship between hormone-induced necrosis of the femoral head and the shock dose of hormone, the oral dose of hormone, and the duration of hormone use? Thank you! Zhang Yao, Department of Orthopedic Surgery, Zhongshan Hospital, Dalian University: There are many causes of femoral head necrosis, and the known causes are: 1, trauma, 2, hormone, and 3, alcohol. Hormonal necrosis of the femoral head is mostly bilateral, and the dosage and duration of hormones have the greatest relationship. Your child has been on medication for 7 months, we recommend that you take your child to the hospital for a checkup. Because the symptoms of femoral head necrosis in the early stage are atypical, most of them are hip discomfort, soreness and swelling, which are not easy to be found, and there may be no abnormality found in the X-ray examination. In addition to taking regular orthopantomograms of both hip joints, we should also take a frog position film. MRI can detect early lesions and is recommended.