“…MSK US is commonly performed in the pediatric population due to its lack of ionizing radiation and not requiring sedation, real-time dynamic imaging, and low cost. B-mode and Doppler US is well-suited for imaging peripheral joints and superficially located tendons, tendon sheaths, and entheses [ 11 , 12 , 13 , 14 ]. Therefore, US is especially useful in patients with JIA where the knee, hand, wrist, hip, ankle, and foot are among the most frequently affected joints [ 10 , 12 , 14 ].…”