The Value of Low-field MR Imaging in Diagnosing Avascular Necrosis of the Femoral Head / 实用放射学杂志

ABSTRACT

Objective To analyze MR imaging findings of avascular necrosis of the femoral head(ANFH)with low-field MR unit.Methods MRI appearances of 35 cases of ANFH confirmed by clinical or pathology were analysed.Results There were 56 hips with "line sign" in 35 cases(58 hips)including "single line sign" in 18 femoral heads and "double line sign" in 38,and there were 2 hips without "line sign".Twenty-six femoral heads had marrow edema.According to Mitchell's gradethere were 15 hips in A grade,21 hips in B grade,13 hips in C grade and 9 hips in D Grade.Conclusion Low-feild MR imaging is of significant value in diagnosing ANFH early.