不同屈膝角度下半月板运动及形态改变的MRI研究

目的通过磁共振检查观测不同屈膝角度下半月板的运动及形态学改变,以期获取准确、完整的数据及变化规律。方法健康志愿者34名行膝关节MRI扫描,每个关节行伸直位和屈膝30°、60°三个体位检查,利用MR容积数据进行MPR重建,测量半月板外周缘在不同体位下的位置和高度改变并进行统计学处理。结果随着屈膝角度的增大,半月板的移动距离和高度有不同程度的增加,移动距离多为外侧半月板大于内侧(P0.05),半月板前角大于后角。半月板前后角均向后移位、体部向外侧移位,从1st至3rd,移动距离呈下降趋势,从4th至7th,半月板移动距离为负值,移动方向为远离半月板中心。结论不同角度屈膝位MRI扫描以无创而简便的方法显示半月板的运动和形态学改变,为更好地认识半月板疾病和半月板移植提供客观依据。

A MRI Study of Meniscal Movement and Morphology Change at Different Flexion Angle of the Knee

Objective To evaluate movement and morphologic change of the meniscal at different flexion angle of the knee by performing MRI scanning in human subjects, so as to obtain accurate and comprehensive data and the rule of the individual variation. Methods Thirty-four healthy knees from volunteers were examined by MRI,The knees were imaged with the knee flexed in different angle (0°, 30°, 60°) with a 3-dimemsional multil-data imaging being processed, the meniscal migration and height change were measured. Results The migration and the height change of the meniscus increased with the knee flexed. Posterior motion of lateral meniscus was greater than medial meniscus mostly, greater in the anterior horn than in the posterior horn (P<0.05). Both of the anterior and the posterior horns of the meniscus migrated posteriorly while the middle portion of the meniscus migrated laterally. There was a decrease in the migration from the 1st to 3rd, but negative values wereobserved from 4th to 7th with the direction being away from the meniscus. Conclusion It is a simple and non-invasive way that MRI scan of the knee at different degrees of flexion, demonstrating the kinematics and morphologic changes of the meniscus, providing better understanding of the meniscus diseases andobjective evidence for meniscus transplantation.