外伤性骨梗死的MRI诊断及鉴别诊断

目的探讨外伤性骨梗死的MR表现特征及其诊断价值。方法回顾性分析8例外伤性骨梗死的MR表现，总结其表现特征。结果8例患者6个膝关节，2个踝关节，共18处病灶：股骨远端5处，胫骨近端5处，股骨干3处，胫骨干1处，胫骨远端2处，距骨滑车2处，腓骨未见受累。MR形态特点：有小斑片5处，大小不等不规则形地图样16处，沿骨干长轴走行长椭圆形3处。MR信号特点：病灶边缘可表现为“单环征”，亦可表现为“三环征”，另有2个小病灶表现为灶性长T1长T2信号。结论骨梗死MR表现特点明确，广泛应用可提高早期诊断率。

MRI diagnosis and differential diagnosis of traumatic bone infarction

Objective To explore the MRI characteristics and diagnostic value of traumatic bone infarction.Methods The MRI appearances of 8 cases with traumatic bone infarction were retrospectively analyzed and the MRI characteristics were summarized.Results In 6 knee joints and 2 ankles of 8 patients,18 bone infarctions were found,of which 5 were located in the distal femur,5 in the proximal tibia,3 in the femoral shaft,1 in the tibial shaft,2 in the distal end of tibia and 2 in the trochlea tali,and there was no fibula involvement.MR showed shape features:small patching shape in 5 of them,irregular geographic shape in 16 of them,oval shape in 3 of them along the sagittal direction.MR showed signal features:single line sign in the rim of some foci,triple line sign in the rim of other foci and 2 small foci manifesting patching long T1 and long T2 signal.Conclusion The traumatic bone infarction manifestation of MRI is characteristic.The wide application of MRI examination may improve the early diagnosis of the disease.