T1 rho和T2 mapping序列观察运动对膝关节半月板的损伤

Observation on impact of activity on knee meniscus with T1 rho and T2 mapping sequences

目的采用T1 rho和T2 mapping序列观察步行、跑步和楼梯运动对膝关节半月板的影响。方法对23名健康志愿者分别于30min休息、走路、跑步和楼梯运动后行右膝关节3.0T MR扫描,每次运动随机选择,间隔期为1周,且运动前休息30min,评估膝关节不同部位半月板运动后T1 rho值和T2值的变化。结果运动后膝关节内侧半月板体部、后角及外侧半月板体部的T1 rho值和T2值均较休息状态减低(P均<0.05)。膝关节内侧半月板T1 rho值和T2值在运动后较休息状态降低率后角>体部>前角,而外侧半月板体部>后角>前角。结论 T1 rho和T2 mapping成像是检测不同运动对膝关节半月板影响的敏感MRI技术。

Objective To observe the impact of walking, running and stair activity on knee meniscus with T1 rho and T2 mapping sequences. Methods Twenty-three participants immediately after 30 minutes of rest, walking, running and stair activity underwent MRI scanning of the right knee, respectively. The 30 minutes rest was conducted before every physical activity. The physical activities were performed randomly to every participant in the morning every other week. T1 rho and T2 values of the meniscus in different physiological activities were estimated. Results T1 rho and T2 values reduced after physiological activities in posterior horn, body of medial meniscus and body of lateral meniscus compared with those of rest state （all P 〈 50.05）. Compared with rest, reduction rate of T1 rho and T2 values of medial meniscus after different physiological activities reduced in the following order：Posterior horn 〉 body 〉 anterior horn, while those of lateral meniscus reduced in the following order：Body 〉 posterior horn 〉 anterior horn. Conclusion T1 rho and T2 mapping sequences are sensitive technologies to monitor the impacts of different activities on knee meniscus.