Department of Radiology, Research Institute of Radiological Science, Medical Convergence Research Institute, and Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, Korea.
Yonsei Med J. 2012 Jul 1;53(4):820-4. doi: 10.3349/ymj.2012.53.4.820.
To evaluate meniscofibular ligament (MFibL) at the posterolateral corner of the knee joint on the magnetic resonance arthrography (MRA) with 70° knee flexion.
The MRA of the knee joint was performed at 70° knee flexion. Eighteen patients (19 knee joints) underwent scanning of sagittal, coronal, and axial fat-suppressed T1 weighted images (T1FS), and coronal fat-suppressed T2 weighted images. Sagittal three-dimensional (3D) gradient echo (GRE) images were also obtained. Retrospective review of 19 knee MRA studies was independently performed by two musculoskeletal radiologists. The statistical significance was proved by chi-square test.
The MFibL ligament was optimally demonstrated on the far lateral sagittal 3D GRE and T1FS MRA images. The MFibL appeared as a curvilinear or straight hypointense band of variable thickness, extended from the posterolateral meniscus to upper anteromedial aspect of the fibular head. The MFibL was demonstrated with scale 2 (more than a half length of the ligament) by both reviewers in 73.68% (n=14/19) of the knee 3D GRE images and 89.47% (n=17/19) of the knee T1FS images. The visualization on T1FS and that on GRE were not statistically different from each other (p>0.05). The interobserver agreements were significantly good on both 3D GRE and T1FS images in detecting the ligament (kappa values, 0.642 and 0.683, respectively).
The MFibL is well visualized on the far lateral sagittal MRA at 70° knee flexion, which could potentially be useful in recognizing structures in the posterolateral corner of the knee, including the MFibL.
在 70°膝关节弯曲的磁共振关节造影（MRA）下评估膝关节后外侧角的半月板腓骨韧带（MFibL）。
对膝关节进行 MRA 检查，膝关节弯曲 70°。18 名患者（19 个膝关节）接受了矢状面、冠状面和轴向脂肪抑制 T1 加权图像（T1FS）以及冠状面脂肪抑制 T2 加权图像的扫描。还获得了矢状面三维（3D）梯度回波（GRE）图像。两名肌肉骨骼放射科医生独立回顾了 19 项膝关节 MRA 研究。通过卡方检验证明了统计学意义。
在外侧矢状面 3D GRE 和 T1FS MRA 图像上可以最佳显示 MFibL 韧带。MFibL 表现为曲线或直线状低信号带，厚度不一，从后外侧半月板延伸至腓骨头前内侧上缘。在 73.68%（n=14/19）的膝关节 3D GRE 图像和 89.47%（n=17/19）的膝关节 T1FS 图像中，两位审阅者均将 MFibL 显示为 2 级（韧带长度的一半以上）。T1FS 和 GRE 的可视化结果彼此之间无统计学差异（p>0.05）。在检测韧带方面，两位观察者在 3D GRE 和 T1FS 图像上的一致性均良好（kappa 值分别为 0.642 和 0.683）。
在 70°膝关节弯曲的外侧矢状面 MRA 上可以很好地显示 MFibL，这可能有助于识别膝关节后外侧角的结构，包括 MFibL。
