RESUMO
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 andT2 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.