A Research on the Changes of T2 time by MRI for Meniscus after Warm-up Exercise / 医学研究杂志

ABSTRACT

Objective To prospectively evaluate changes in T2 relaxation times in the meniscus with warm-up excise using MRI in healthy knees,and explore the feasibility of evaluating the morphological changes of meniscus after acute warming-up by T2 time response.Methods A total of 40 healthy adult volunteers were enrolled,which included 15 males and 25 females;aged 22-30 years old with mean age of 26.32 ± 2.1.T2 mapping sequential imaging was performed to measure the T2 time of medial and lateral anterior,body,posterior before and after warm-up exercise.A paired Student's t test was used to determine the effects of warm-up exercise on T2 times.Results All volunteers showed a significant increase in T2 values after warm-up exercise in all meniscus compartments (P =0.000),which may indicate changes in the biochemical composition of meniscal tissue.The lateral body compartment experienced more increment than medial anterior (P ＜ 0.05),medial posterior (P ＜ 0.05) and lateral posterior parts (P ＜ 0.05) after warm-up exercise.Conclusion Longer T2 values after warm-up exercise suggest increment in the water content of knee meniscus,which may indicate improvements in the physiological activity and protection of meniscus.T2 values in menisci have the potential to be used as biomarkers for identifying meniscus changes after exercise.