摘要
目的探讨寰枢关节失稳的翼状韧带形态学改变并评价MRI应用价值。资料与方法病变组包括39例寰枢关节失稳,其中寰椎前移位型失稳7例,侧方移位型失稳6例,旋转型失稳26例;另随机选取50名无症状自愿者作为对照组。两组均行高分辨质子序列MRI。依据高信号区与韧带截面积比例将翼状韧带分为0～2级。结果 0～2级翼状韧带病变组分别占33.33%、38.46%和28.21%;对照组分别占78.00%、20.00%和2.00%,两组间差异有统计学意义(P=0.000)。0～2级翼状韧带旋转型失稳分别占19.23%、42.31%和38.46%;合并组(前移位型+侧方移位型失稳)分别占61.54%、30.77%和7.70%,较高分级韧带前者多于后者(P=0.023),翼状韧带信号升高与旋转型失稳相关(r=0.440,P=0.005)。结论 MRI高分辨质子序列对翼状韧带成像有重要价值,翼状韧带信号升高可作为诊断寰枢关节旋转失稳的参考指标。
Objective To discuss the morphology of alar ligament in atlanto-axial instability and to assess the value of MRI. Materials and Methods 39 cases of atlanto-axial instability （atlars displaced anteriorly in 7 cases,displaced laterally in 6 cases,rotated on axis in 26 cases） and 50 asymptomatic volunteers underwent proton-weighted MR imaging of the craniovertebral junction. Alar ligaments were graded （grades 0-2） based on the ratio between the high signal area and the total cross-sectional area. Results There was significant difference in alar signal between two groups （Grade 0-2 alar：33.33%,38.46%,28.21% vs 78.00%,20.00%,2.00% respectively, atlanto-axial instability vs control group, P=0.000）.Higher grade alar occurred more common in the rotated instability （Grade 0-2 alar：19.23%,42.31%,38.46% vs 61.54%,30.77%,7.70% respectively, rotated instability vs combined type （atlars displaced anterioly ＋ displaced laterally）（P=0.023）.High signal were related to rotated instability（R=0.440,P=0.005）. Conclusion High resolution proton-weighted MR imaging have a great role in detecting the alar lesions. Alar high signal can be used as a reference indicator to judge the atlanto-axial rotated instability.
出处
《临床放射学杂志》
CSCD
北大核心
2010年第8期1086-1089,共4页
Journal of Clinical Radiology
关键词
翼状韧带
失稳
寰枢关节
磁共振成像
Alar ligament Instability Atlantalaxial joint Magnetic resonance imaging
