To observe the changes and recovery of T2 values of menisci in amateur marathon participants at different times, and to examine the effect of marathon exercise on meniscal microstructure. Twelve healthy marathon volunteers were recruited continuously, including 5 males and 7 females, with mean (± SD) age of 27.5 ± 5.2 years. The body mass indices (BMIs) ranged from 17.6 to 27.2 kg/m2, with a mean of 21.9 ± 2.5 kg/m2. The 24 knee joints were scanned using a 3 T MR scanner at 1 week before the event, and at 12 h and 2 months after the event. T2 values of the anterior horn of the medial meniscus (MMAH), posterior horn of the medial meniscus (MMPH), anterior horn of the lateral meniscus (LMAH), and posterior horn of the lateral meniscus (LMPH) were measured by drawing the regions of interest (ROIs) on the T2 map images. Wilcoxon sign rank test was used to compare the T2 values between 1 week before and 12 h after the event, and between 1 week before and 2 months after the event in each anatomical region, respectively. The T2 values of the menisci at 12 h after the event were significantly higher (P < 0.05) than those at 1 week before the event. No statistically significant differences in the T2 values of the menisci were found between 2 months after and 1 week before the event (P > 0.05). The T2 values of MMAH, MMPH, LMAH, and LMPH showed a trend of "increasing first and then decreasing" over time, suggesting that the T2 values may reflect meniscal microstructure in amateur marathon runner.
Objective To obtained the cortex and cancellous parameter of the vertebral bone of healthy subjects using QCT. To expore which is early and faster for bone loss with age. Materials and methods 733 physical examiners underwent chest low-dose CT examination were recruited, from January 1, 2021 to December 31, 2021. QCT sequence was used to obtain the bone mineral density of T12-L2 vertebral body without radditional radiation.The mass and area of vertebral cortex and cancellous at the central level of L2 vertebral bodywere measured. The characteristics of vertebral cortex and cancellous with age were analyzed and compared. Results Significant differences were found involumetricbone mineral density (vBMD) of T12-L2verterbal body, cortical mass, cancellous mass, cortical area, cortical mass / cancellous mass and cortical area / cancellous area in different age groups, respectively.No significant difference was found in all groups for cancellous area. ThevBMD of T12-L2 vertebral body decreased with age; The cortical mass decreased gradually before 71y.The cancellous mass increased and then decreased with peak at 31-40y.The cortical area decreased gradually before 71y.The cancellous area increasedand then decreased with peak at the age of 41–50.The values of cortical mass/cancellous mass showed a slowly downward trendwith age. The values of cortical area / cancellous area decerased before 61y. Conclusion The changes of vertebral BMD, bone content ofcortex and cancellous have different characteristics in different age. The change of cortex may be earlier and faster than that of cancellous with age.
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