In this issue of Clinics in Sports Medicine, guest editors Drs. Jonathan F. Dickens and Brian C. Lau bring their considerable expertise to the topic of Shoulder Instability. Shoulder instability is a common injury in sports and orthopedic surgeons must stay up to date with on-field assessment, current imaging, and surgical and nonsurgical treatment strategies to help athletes get back in the game. In this issue, top experts discuss anterior and posterior shoulder instability in athletes, including shoulder anatomy and biomechanics, imaging, operative and nonoperative treatments, and more.