X-ray examination is difficult to diagnose early femoral head necrosis, and only those experienced specialists can detect the early signs of osteonecrosis from the subtle changes in X-ray plain films. Clinical studies have shown that MRI (magnetic resonance imaging), bone isotope scan and intraosseous manometry all help to detect information of early femoral head necrosis and can find subtle changes in the early stages of femoral head necrosis that cannot be shown by conventional X-ray examination. The early diagnosis of femoral head necrosis is 85.7% with SPECT (isotope bone scan), 80% with MRI, and 77% with intraosseous pressure measurement, while conventional bone scan only accounts for 68.4%. the diagnostic rate of MRI and SPECT control examination can reach 100%, MRI (magnetic resonance imaging) and SPECT (isotope bone scan) are economic and effective methods for early diagnosis of femoral head necrosis. MRI (magnetic resonance imaging) and SPECT (isotope bone scan) are economic and effective methods for early diagnosis of femoral head necrosis. Zhang Rui, Department of Medical Imaging, Sixth Affiliated Hospital of Xinjiang Medical University