Magnetic resonance t1rho mapping of articular cartilage grafts after autologous osteochondral transplantation for osteochondral lesions of the talus: A longitudinal evaluation

Haraguchi, Naotsugu; Ota, Koki; Ozeki, Takuma; Nishida, Naoki; Yoshida, Takashige; Tsutaya, Atsushi

doi:10.1016/j.fas.2017.07.1098

Cited by 1 publication

(1 citation statement)

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“…Several publications have proven the capabilities of compositional MRI assessment techniques for detecting the initial stages of cartilage degenerative change before imaging findings seen on morphological MRI in the knee joints (13)(14)(15). Of these techniques, T1rho and T2 mapping have been shown to be feasible for quantifying ankle cartilage with high reproducibility (16)(17)(18)(19).…”

Section: Introductionmentioning

confidence: 99%

T1rho and T2 mapping of ankle cartilage of female and male ballet dancers

Horiuchi

Luk

et al. 2020

Acta Radiol

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Background 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. Purpose To investigate the angle-dependent T1rho and T2 profiles of ankle cartilage in non-dancers and dancers. Material and Methods 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. Results 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. Conclusion 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.

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