Purpose: To study the diagnostic value of MR of early avascular necrosis of the femoral head (ANFH).

目的：研究MR对早期股骨头缺血坏死(ANFH)的诊断价值。

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MRI has very high value in staging, joint effusion showing and prediction of collapse of the femoral head in ANFH.

MRI在ANFH的分期、关节积液的显示及股骨头塌陷的预测等方面具有很高的价值。

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Purpose: To evaluate the features and staging of avascular necrosis of the femoral head (ANFH) using Low-field MRI.

目的：分析股骨头缺血坏死（ANFH）低场MRI征象，评价ANFH的MRI分期及其关节积液的分级。

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