Horiuchi Saya, Yu Hon J, Luk Alex, Rudd Adam, Ton Jimmy, Kuoy Edward, Russell Jeffrey A, Sharp Kelli, Yoshioka Hiroshi
Department of Radiological Sciences, University of California, Irvine, CA, USA.
Science and Health in Artistic Performance, Ohio University, Athens, OH, USA.
Acta Radiol. 2020 Oct;61(10):1365-1376. doi: 10.1177/0284185120902381. Epub 2020 Feb 6.
Since ballet dancers begin their training before skeletal maturity, accurate and non-invasive identification of cartilage diseases is clinically important. Angle-dependent analysis of T1rho and T2 sequences can be useful for quantification of the composition of cartilage.
To investigate the angle-dependent T1rho and T2 profiles of ankle cartilage in non-dancers and dancers.
Ten female non-dancers, ten female dancers, and 9 male dancers were evaluated using T1rho and T2 mapping sequences. Manual segmentation of talar and tibial cartilage on these images was performed by two radiologists. Inter- and intra-rater reliabilities were calculated using intraclass correlation coefficients (ICCs) and Bland-Altman analysis. Mean thickness and volume of cartilage were estimated. Angle-dependent relaxation time profiles of talar and tibial cartilage were created.
ICCs of the number of segmented pixels were poor to excellent. Bland-Altman plots indicated that differences were associated with segment sizes. Segmented cartilage on T1rho demonstrated larger thickness and volume than those on T2 in all populations. Male dancers showed larger cartilage thickness and volume than female dancers and non-dancers. Each cartilage demonstrated angular-dependent T1rho and T2 profiles. Minimal T1rho and T2 values were observed at approximately 180°-200°; higher values were seen at the angle closer to the magic angle. Minimal T2 value of talar cartilage of dancers was larger than that of non-dancers.
In this small cohort study, regional and sex variations of ankle cartilage T1rho and T2 values in dancers and non-dancers were demonstrated using an angle-dependent approach.
由于芭蕾舞演员在骨骼成熟之前就开始训练，因此准确且无创地识别软骨疾病在临床上具有重要意义。T1rho和T2序列的角度依赖性分析可用于量化软骨成分。
研究非舞者和舞者踝关节软骨的角度依赖性T1rho和T2特征。
使用T1rho和T2映射序列对10名女性非舞者、10名女性舞者和9名男性舞者进行评估。两名放射科医生对这些图像上的距骨和胫骨软骨进行手动分割。使用组内相关系数（ICC）和布兰德-奥特曼分析计算评分者间和评分者内的可靠性。估计软骨的平均厚度和体积。创建距骨和胫骨软骨的角度依赖性弛豫时间特征。
分割像素数量的ICC从差到优。布兰德-奥特曼图表明差异与分割大小有关。在所有人群中，T1rho上分割的软骨比T2上的软骨厚度和体积更大。男性舞者的软骨厚度和体积大于女性舞者和非舞者。每种软骨都表现出角度依赖性的T1rho和T2特征。在大约180°-200°处观察到最小的T1rho和T2值；在接近魔角的角度处观察到更高的值。舞者距骨软骨的最小T2值大于非舞者。
在这项小型队列研究中，使用角度依赖性方法展示了舞者和非舞者踝关节软骨T1rho和T2值的区域和性别差异。
