Abstract #2786

Quantification of joint capsule laxity of the tibiotalar and subtalar joints in ballet dancers at 3T MRI

Toshimi Tando¹, Saya Horiuchi¹, Hon J. Yu¹, Alex Luk¹, Jeffrey A. Russell², Kelli Sharp³, and Hiroshi Yoshioka¹

¹Department of Radiological Sciences, University of California, Irvine, Orange, CA, United States, ²Science and Health in Artistic Performance, Ohio University, Athens, OH, United States, ³Department of Dance, The Claire Trevor School of the Arts, University of California, Irvine, Irvine, CA, United States

Joint capsule laxity/thickening is one of predisposing factors of posterior ankle impingement syndrome. The purpose of this study is to quantitatively evaluate size of the tibiotalar and subtalar joint recesses in MR images in ballet dancers, compared to non-dancers. The results showed that posterior subtalar joint recess volume, distal tibiofibular joint area, medial posterior tibiotalar recess area, and medial posterior capsule distance were larger in female dancers than female non-dancers. These findings indicate that joint capsule laxity can be measured quantitatively and used for quantitative evaluation of posterior ankle impingement.

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