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[目的]研究症状性与非症状性儿童外侧盘状半月板(discoid lateral meniscus,DLM)在MRI冠状面上的形态学差异。[方法]自2009年7月~2012年7月,32例症状性儿童外侧盘状半月板(研究组)和27例非症状性儿童外侧盘状半月板(对照组)被纳入研究。在MRI同一冠状面图像上测量两组外侧盘状半月板的游离缘高度、体部高度、关节囊缘高度、体部宽度、股骨外侧髁宽度以及内侧半月板高度等形态学指标。计算外侧盘状半月板游离缘高度、体部高度、关节囊缘高度与内侧半月板关节囊缘高度的比值,外侧盘状半月板体部宽度与股骨外侧髁宽度的比值以及外侧盘状半月板游离缘高度与其体部高度、关节囊缘高度的比值等相对形态学指标,所得数据进行Wilcoxon秩和检验。[结果]研究组外侧盘状半月板冠状面体部宽度为30 mm,大于对照组的24 mm(P<0.001);研究组外侧盘状半月板冠状面游离缘高度为5 mm,大于对照组的3 mm(P<0.001);研究组外侧盘状半月板体部高度为2.5mm、关节囊缘高度为3 mm,分别小于对照组的4 mm和5 mm(P<0.001)。而内侧半月板关节囊缘高度以及股骨外侧髁宽度等形态学指标两组间比较差异无统计学意义(P>0.05)。与对照组比较,研究组外侧盘状半月板体部宽度与股骨外侧髁宽度比值(P<0.001)、外侧盘状半月板游离缘高度与内侧半月板高度的比值(P=0.001)以及外侧盘状半月板游离缘高度与其自身体部高度比值(P<0.001)增加,而外侧盘状半月板体部高度及关节囊缘高度与同层面内侧半月板高度的比值降低(P<0.001)。[结论]外侧盘状半月板在MRI冠状面上的体部宽度、游离缘高度、体部高度以及关节囊缘高度等参数可以作为评价儿童外侧盘状半月板损伤与否的形态学指标。
[Objective] To study the morphological difference of the coronal plane of symptomatic and non-symptomatic children’s lateral discoid lateral meniscus (DLM). [Methods] From July 2009 to July 2012, 32 symptomatic children ’s lateral discoid meniscus (study group) and 27 non - symptomatic children’ s lateral discoid meniscus (control group) were included in the study. On the same coronal plane image of MRI, the morphological indexes such as height of free rim, body height, height of joint rim, body width, width of lateral femoral condyle and height of medial meniscus were measured. Calculate the ratio of the free edge height, body height, the height of joint margin and the height of the medial meniscus, the ratio of the width of the lateral discoid meniscus to the lateral femoral condyle, and the ratio of the lateral discoid meniscus Free edge height and the height of the body, the height of the joint margin and other relative morphological indicators, the data obtained Wilcoxon rank sum test. [Results] The width of the coronal plane of the lateral discoid meniscus in study group was 30 mm, which was larger than that of the control group (P <0.001). The coronal free edge height of the lateral discoid meniscus in the study group was 5 mm, 3 mm (P <0.001). The height of the lateral discoid meniscus in the study group was 2.5 mm and the height of the joint margin was 3 mm, which were smaller than those of the control group (4 mm and 5 mm, P <0.001). There was no significant difference between the two groups (P> 0.05) in the morphological indexes of medial meniscus joint margin and lateral femoral condyle width. Compared with the control group, the ratio of the lateral discoid meniscus body width to the lateral femoral condyle width (P <0.001), the ratio of the lateral discoid meniscus free edge height to the medial meniscus height (P = 0.001), and the lateral disc (P <0.001). However, the ratio of the height of the lateral discoid meniscus and the height of the joint capsule to the level of the medial meniscus in the same level decreased (P <0.001). [Conclusion] The parameters such as body width, height of free edge, body height and height of joint rim can be used as the morphological indexes to evaluate the lateral discoid meniscus injury of the lateral discoid meniscus.