健康人Bassent ’ s韧带的MRI最佳扫描层面的探索及测量

摘要

目的： Bassent’s韧带即胫腓前下韧带远侧束病变是导致前外踝疼痛的重要原因，探索正常人Bassent’s韧带的MRI最佳显示层面并测量，为其急慢性损伤的诊断提供MRI解剖结构对照。方法对32名已签署知情同意书的健康受检者行踝关节MRI扫描，男12例，女20例，年龄23～30岁，平均年龄26岁。踝摆放姿势为中立位，扫描常规（正）横断位（TRA）、矢状位（SAG）、冠状位（COR）T1WI、T2WI快速回波序列后，选择TRA-T1WI为定位像，做与Bassent’s韧带平行的斜COR-T1 WI、斜COR-T2 WI层面成像，再选择斜COR-T1 WI做与Bassent ’ s韧带平行的斜TRA-T1 WI、斜TRA-T2 WI层面成像，获得图像后选择能显示韧带走行的最佳层面，在该层面观察并测量记录韧带的长度及宽度。结果 Bassent ’ s韧带MRI图像显示率为96．7％（29／32），其绕过距骨顶前外缘时稍有弯曲，T1WI及T2WI上均为均匀低信号改变，在斜COR及斜TRA该韧带全长显示佳，斜冠状面测量平均长度为（11．01±0．94）mm，平均直径为（3．06±0．50）mm，胫骨附着点直径较宽，平均为（4．47±0．88）mm；较胫腓前下韧带复合体走形更加趋于水平，两者平均夹角为（22．71±6．72）°。结论磁共振借由其多平面成像的优势，可清晰显示Bassent ’ s韧带，与韧带全长平行的斜面成像可显示其全长，促成韧带个体化MRI检查与诊断。%Objective Bassent’s ligament was the distal fascicle of the anterior inferior tibiofibular ligament (AITFL), we were looking for the best MR imaging plans of this ligament to create normal criteria to decide whether it is pathological .Methods 32 volunteers (12 males, 20 females) with an average age of 26 years old were performed with MRI of ankle .MRI scans included standard axial (TRA), sagittal (SAG) and coronal (COR) of T1WI and T2WI, then TRA-T1WI was chosen as scout image, ob-lique imaging planes parallel to the long axis of this ligament were obtained , oblique MR imaging planes included oblique coronal and oblique axial planes .The anatomy and measurement of Bassent ’ s ligament is demonstrated and described with these planes . Results This band the distal fascicle was present in 29(96.7%) of 32 volunteers , it crossed the talocrural joint .MR imaging in the coronal and axial oblique planes showed the entire extent of the Bassent ’s ligament.Measurements were performed in the coronal planes, with average (11.01 ±0.94) mm in length, (3.06 ±0.50) mm in diameter, with a wider anteromedial tibial at-tachment of (4.47 ±0.88) mm.It had a more horizontal course than did the other portions of the AITFL , there were 22.71 ± 6.72 degrees between them .Conclusion MRI by its advantage of multiplanar imaging could clearly display Bassent 's ligament, oblique MR imaging planes parallel to the long axis of the ligament could optimize visualization of the normal Bassent 's ligament, which facilitated the ligament individualized MRI examination and diagnosis .