成人股骨头缺血性坏死的MRI表现

MRI Findings of the Patients with Avascular Necrosis of Femoral Head

目的 探讨股骨头坏死MRI的各种表现特征。方法 分析 2 6例 (4 1个股骨头 )股骨头坏死的MRI的各种表现。所有病例均作平片、MRI检查。MRI采用 0 .5Tesla超导性磁共振成像机。结果 (1)MRI的一般表现 :线样征发生率为 90 % ,双线征发生率 73 %。 (2 )MRI的信号分类 :A级类似脂肪信号 ,占 46 % ;B级类似血液信号 ,占 17% ;C级类似液体信号 ,占 2 2 % ;D级类似纤维组织信号 ,占 15 %。 (3)MRI信号分类与平片分期比较 :平片分期的Ⅰ、Ⅱ期 ,大多数病例表现为MRI的A级信号 ,占 6 3%。此两期中无表现为MRI的D级信号。 (4 )合并骨髓水肿改变 :有 17个股骨头 (4 1% )合并骨髓水肿。结论 MRI不仅能观察坏死区域的信号改变 ,同时能观察坏死灶周围的骨髓水肿。

Objective To study MRI findings of the patients with avascular necrosis of femoral head. Methods MRI findings of 26 patients with avascular necrosis of femoral head (41 femoral heads) were analyzed retrospectively. All patients with plain radiograph and MRI were examined.Results The characteristic “band-like”and “double line” signs were seen in 73% and 90% of heads respectively. Lesions could be separated into four grades: A(46%), B(17%), C(22%) and D(15%) grade. Most of the stage Ⅰand Ⅱ (63%) on plain films showed grade A lesions while none of them showed grade D lesions. The images of the femoral head showed signs of BME in 17 (41%) cases. Conclusion MRI imaging should be the imaging modality choozen for early detection. MRI images could show the local lesion and bone marrow edema