246.Sacral and iliac insufficiency fractures（骶椎、髂骨机能不全性骨折）

【Sacral and iliac insufficiency fractures 骶椎、髂骨机能不全性骨折】

MRI images should be obtained in the axial (Fig 1 and Fig 2) and coronal (Fig 3) planes.  Conventional T1- and T2-weighted sequences are usually adequate for diagnosis.  However, STIR or fat suppressed fast spin-echo images can be used instead of T2-weighted sequences.  We find fat suppression techniques useful, because of the inhomogeneous appearance of yellow and red marrow in the pelvis.

MRI应行轴位和冠状位摄片，常规T1、T2序列足以明确诊断。压脂或快速自旋回波压脂序列也可以代替T2加权序列。压脂序列有助于诊断是因为骨盆的红骨髓和黄骨髓显示不均。

Insufficiency fractures in the sacrum and ilium are low intensity on T1-weighted images.  The pattern is typically linear.  T2-weighted images may be more confusing due to a combination of high intensity edema and low intensity reparative bone or compressed trabeculae (Fig 3).

骶骨和髂骨的机能不全性骨折T1呈低信号。典型表现为线样骨折。T2上，由于骨髓水肿高信号，新生骨或骨小梁受压的低信号，常呈混杂信号。

Notes:

1. Sacral ['seɪkrəl] adj. 骶椎

2. iliac ['ɪlɪˌæk] adj. 髂骨的

3. inhomogeneous [ˌɪnhoʊmə'dʒi:nɪrs] adj. 非均匀

4. reparative ['repərətɪv] adj. 修缮的，赔偿的，弥补的

5. trabeculae [trə'bekjələ] n. 小梁

来源：每天朗读一段医学影像学英语文章