膝关节内侧半月板后根撕裂的MR影像征象

目的探讨MR对膝关节内侧半月板后根撕裂的影像诊断价值。方法回顾性分析40例经关节镜确诊膝关节内侧半月板后根撕裂的MR影像学特征,并分析膝关节韧带损伤及半月板脱位等伴随征象。结果直接征象:40例患者中有36例MR上表现为内侧半月板后根形态及信号的异常改变:轴位显示内侧半月板根部的放射状撕裂,冠状位显示存在信号截断,矢状位表现为空半月板征。伴随征象:半月板脱位:32/36例患者冠状位表现为内侧半月板脱位;关节韧带损伤:14/36例患者矢状位上可见前交叉韧带形态改变及异常高信号;关节退变:34/36例患者关节软骨内出现异常高信号影。结论 MR是诊断内侧半月板后根撕裂及其伴随征象的有效检查方法。

MR imaging findings of posterior meniscal root tear of the medial meniscus

Objective To explore diagnostic value of MR imaging on the medial meniscus root tear.Methods 40 patients confirmed by arthroscopy knee medial meniscus posterior root tear underwent MRI,and the imaging features and accompanied signs of ligaments injured and meniscus extrusion were reviewed retrospectively.Results Direct signs:Of the 40 patients,36 cases MR imaging appearanced abnormal of medial meniscus posterior root morphology and signal:the radial tear on the meniscal root of the medial meniscus in the axial plane,the presence of the truncation sign in the coronal plane and the ghost meniscus sign in the sagittal plane.Accompanied by signs:Meniscus extrusion:32 cases showed mendial meniscus extrusion in the coronal palne.Ligament injuried:the anterior ligaments morphological changes and abnormal high signal in 14 patients.Knee joint degeneration:articular cartilage of 34 cases with abnormally high signal intensity.Conclusion MR can effectively demonstrate imaging features of medial meniscal root tear and its accompanying signs.