摘要
目的:在MR矢状位多角度下显示膝关节前交叉韧带,探讨膝关节前交叉韧带的最佳显示及正常影像表现。方法:选择30例双侧膝关节前交叉韧带受检者,每组均以横断位定位,以髁间窝区域为扫描范围,按6种不同角度进行扫描。第1组以髌骨前缘作垂线经过髁间窝中心进行扫描;第2～5组以股骨髁间窝水平后缘连线经髁间窝中点的垂直线做基准线,偏离垂线5°、10°、15°及20°进行扫描;第6组以髁间窝水平股骨外侧缘的平行线进行扫描。将各扫描所得数据进行统计学分析。结果:6种扫描方式中,第1、3组完全显示前交叉韧带分别为58.3%(35/60)和61.7%(37/60),两者与其余组进行统计学分析,P<0.05,差异具统计学意义。前交叉韧带的影像正常表现为93%～97%的厚度在5mm以下;形态以直线条状为主;骨端以两端无"扫帚"样征附着为主,胫侧附着呈"扫帚"样征次之;韧带边缘以后缘模糊及前后缘模糊为主。结论:膝关节斜矢状位10°扫描方式下的前交叉韧带的显示度、清晰度最佳,是临床理想的扫描倾角,同时能清晰地显示前交叉韧带的正常解剖及便于发现病变,为可靠的诊断提供良好的影像学资料。
Objective：To obtain the optimal MRI scanning position for displaying the anterior cruciate ligament of knee from different sagittal angles,and to explore the normal MRI imaging of the anterior cruciate ligament.Methods：MRI of bilateral knees was performed in 30 cases without knee-joint trauma.The sagittal MR scanning for every subject included the following six series（six groups）：group 1,the scanning baseline was perpendicular to the front margin of the patella and,right through the intercondylar center;group 2-5,the scanning baseline was at the angle of 5°,10°,15° and 20° respectively to the above perpendicular line;and group 6,the scanning baseline was parallel to the lateral margin of femur at the intercondylar fossa level.All the images were separately evaluated by three exprienced MR specialists.The display of whole anterior cruciate ligament and its sharpness were observed and assessed.The results were statistically analyzed.Results：The displaying rate of whole anterior cruciate ligament in group 1 and group 3 was 58.3%（35/60）and 61.7%（37/60）respectively,both of which were significantly higher than those in other four groups（P〈0.05）.On MRI,the normal anterior cruciate ligaments were almost（about 95%）less than 5 mm in thickness and were manifested as straight strip structure.In most cases,its bilateral ends showed no ＂broom sign＂,while the tibial attachment exhibited ＂broom sign＂ appearance.Its front and back borders were usually blurred.Conclusion：The optimal MR image of the anterior cruciate ligament can be obtained when the knee-joint is scanned with the scanning baseline at an angle of 10° to the line perpendicular to the front margin of the patella.A distinct presentation of the anterior cruciate ligament is very important for making clinical diagnosis.
出处
《现代医学》
2010年第3期221-225,共5页
Modern Medical Journal
关键词
膝关节
前交叉韧带
磁共振成像
knee
anterior cruciate ligament
magnetic resonance imaging
