半月板运动及形态学改变的动态磁共振研究

The study of meniscal movement and morphologic change with dynamic MRI imaging

目的 :通过动态磁共振检查屈膝过程中半月板的运动及形态学改变 ,并探讨其发生机制。方法 :3 0个健康志愿者 3 0膝从 0°到屈曲 40°时的内、外侧半月板被矢状面和冠状面成像检查。同时测量了每一个半月板在屈膝过程中向后移动、高度改变及侧方移动的具体数值。结果 :通过测量显示每一个半月板在屈曲时均向后移动 ,外侧半月板比内侧半月板运动距离大 ,前角比后角大 (P <0 .0 1) ,内、外侧半月板后角运动范围最小。随着屈膝半月板高度均有不同程度的增加 ,半月板的前后径减少 ,同时可见半月板向侧方移位。结论 :随着膝关节屈曲半月板向后及侧方移动 ,半月板的形态亦发生改变 ,这可能与膝关节股骨髁、胫骨髁的形状有密切关系 ,同时与半月板的附着方式及关节囊和周围韧带有关。

Objective: To evaluate meniscal movement and morphologic change during knee flexion with dynamic MRI and discuss its forming mechanism. Methods: Thirty healthy knees from volunteers were examined by dynamic MRI .The knees were imaged from 0° to 40° flexion in the sagittal and coronal plane .At the same time the meniscal posterior movement distance, the meniscal height change and the lateral movement distance values were measured. Results: During knee flexion we saw each meniscus moved posteriorly . Posterior motion of lateral meniscus was greater than medial meniscus , greater in the anterior horn than in the posterior horn (P<0.01). Excursion value of the posterior horn of medial meniscal was the least, and meniscal height increased consequently , the anterior-posterior diameter of meniscus was reduced and lateral excursion of the meniscus could be found .Conclusion: From this research we know that as the knee flexion menisci move posteriorly and change its shape, which may be greatly related to the appearance of femoral condyles , as well as ligament and knee joint capsule .