低场强磁共振成像在股骨头坏死诊断中的应用

Application of Low-field Magnetic Resonance Imaging in the Diagnosis of Femoral Head Necrosis

目的探讨股骨头坏死的低场强磁共振诊断。方法对18例共26个经磁共振诊断为股骨头缺血坏死的MRI图像进行观察和分析,并对其影像学改变进行分期。结果26个股骨头中,0期3个,Ⅰ期5个,Ⅱ期5个,Ⅲ～Ⅳ期13个,低场MRI能较特异地反映股骨头缺血坏死的各期表现",双线征"是股骨头缺血坏死早期的特征表现。结论低场MRI不仅能发现股骨头缺血坏死的早期病变,而且能反映病变的确切范围和程度,对早期治疗和预后都有积极意义。

Objective To evaluate the diagnosis value of low-field magnetic resonance imaging（MRI） in femoral head necrosis. Methods Twenty-six femoral heads of 18 cases of femoral bead necrosis were studied with MRI,and their image changes were staged. Results Twenty-six femoral heads showed Stage zero for 3 heads, Stage I for 5, Stage II for 5 and Stages III- IV for 13. Low-field MRI could specifically reflect each stage of imaging findings of femoral head necrosis. ＂Double-line sign＂ was the characteristic expression of MRI in early femoral head necrosis. Conclusion Low-field MRI can exactly display early femoral head necrosis and reflect accurate the scope and the degree of the lesion. It is of great value in its early treatment and prognosis.