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《Hebei Medicine》 2009-06
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The Value of Low Field MRI in Diagnosis of Early Avascular Necrosis of Femoral Head

HE Hua(The People's Hospital of Nanxiong,Guangdong Nanxiong 512400,China)  
Objective:To assay the value of low field MRI in diagnosis of early avascular necrosis of femoral head.Method:Imaging data of X-ray、CT and low field MRI of 38 cases(56 sites)with avascular necrosis of femoral head were analyzed retrospectively,Rank sum H test and sensitivity were completed.Result:All the cases were diagnosed as early ANFH by X—ray film in 35 sites,Stage I showed osteoporosis and osteosclerosis in 15 sites,Stage II showed osteosclerosis and cystic hyalomere in 20 sites.56 cases of early ANFH were discovered by CT in 43 sites.Stage I stelliform sign distortion and osteoporosis and osteosclerosis in 17 sites,Stage II showed meniscus sign was 26 sites.Low field MRI displayed 38 cases(56 sites)of early ANFH,Stage I displayed the maeular shape low or high signal intensity on T1 weighted image in 25 sites.Stage II displayed the irregular shape low or equal or high signal on T1 and T2 weighted image in 21 sites.Stage Ⅲ displayed the flaky low signal and curve high signal on T1 and T2 weighted image in 12 sites.Rank sum H test and sensitivity compare were striking.Conclusion:Low field MRI has high sensitivity for early diagnosis of ANFH,and the accuracy of necrostic location and staging,diagnostic value is superior to CT and X—ray film.
【CateGory Index】: R445.2;R681.8
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