Boxheimer Larissa, Lutz Amelie M, Treiber Karl, Goepfert Kerstin, Crook David W, Marincek Borut, Weishaupt Dominik
Institute of Diagnostic Radiology, University Hospital Zurich, Raemistrasse 100, CH-8091 Zurich, Switzerland.
Invest Radiol. 2004 May;39(5):254-63. doi: 10.1097/01.rli.0000116895.04239.84.
To evaluate position related changes of the menisci in asymptomatic volunteers based on MR imaging of the knee in different positions.
Twenty-two knees from 22 asymptomatic volunteers with no history of knee injury and no evidence of meniscal tears were examined with a 0.5-T open-configuration MR system. Sagittal and coronal images were obtained with the knee supine in neutral, supine in 90-degree flexion with external and internal rotation, as well as in upright weight-bearing positions. The position of the menisci from the outer inferior edge of the meniscus to the outermost edge of the articular cartilage of the tibial plateau was measured, and meniscal movement was calculated. The Wilcoxon signed-rank test was used for statistical analysis.
Meniscal movement in the sagittal plane was greatest in the anterior horn of the medial meniscus upon position change from supine neutral to supine in 90-degree flexion with external rotation (mean, 10.5 millimeters). The least meniscal movement was observed in the anterior horn of the lateral meniscus when changing from the supine neutral to the upright knee position (mean, 0.6 millimeters). Meniscal protrusion (ie, protrusion of any part of the meniscus beyond the tibial plateau) was noted most frequently for the anterior horn of the medial meniscus (14/22 instances; 63.6%) in the sagittal plane with the knee in neutral position (mean, 2.6 millimeters, range, 1.8-2.8 millimeters). In the coronal plane, medial meniscal protrusion was most frequently present in the upright weight-bearing position (11/22 instances (50%; mean, 2 millimeters; range, 1.2-2.6 millimeters).
: Meniscal movement is most prominent in the anterior horn of the medial meniscus with the knee in the supine position in 90-degree flexion with external rotation. Meniscal protrusion is more frequently present in the medial meniscus and averaged less than 3 millimeters in normal volunteers in either the sagittal or coronal MR imaging plane.
基于膝关节在不同位置的磁共振成像，评估无症状志愿者半月板的位置相关变化。
使用0.5-T开放式磁共振系统对22名无膝关节损伤史且无半月板撕裂证据的无症状志愿者的22个膝关节进行检查。在膝关节中立位仰卧、90度屈曲并外旋和内旋仰卧以及直立负重位时获取矢状面和冠状面图像。测量半月板从半月板外下边缘到胫骨平台关节软骨最外边缘的位置，并计算半月板移动情况。采用Wilcoxon符号秩检验进行统计分析。
从仰卧中立位变为90度屈曲并外旋仰卧位时，内侧半月板前角在矢状面的移动最大（平均10.5毫米）。从仰卧中立位变为直立膝关节位时，外侧半月板前角的半月板移动最小（平均0.6毫米）。在矢状面膝关节中立位时，内侧半月板前角的半月板突出（即半月板任何部分超出胫骨平台）最为常见（14/22例；63.6%）（平均2.6毫米，范围1.8 - 2.8毫米）。在冠状面，内侧半月板突出在直立负重位最为常见（11/22例（50%）；平均2毫米；范围1.2 - 2.6毫米）。
膝关节在90度屈曲并外旋的仰卧位时，内侧半月板前角的半月板移动最为显著。在矢状面或冠状面磁共振成像平面中，正常志愿者内侧半月板的半月板突出更为常见，平均小于3毫米。
