It has been a pleasure to serve as guest editor for this issue of Seminars in Musculoskeletal Radiology. It updates some of the more important applications and addresses new developments in musculoskeletal ultrasound. Unlike other musculoskeletal ultrasound issues or articles, I chose to deviate from the common joint-based organization and instead to arrange the material based on focused topics. In addition, I decided to shorten the length of each article to allow 14 topics to be discussed in a succinct fashion. I am pleased that some of the best known experts in the field have contributed to this issue.
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