Short axis ultrasound (US) image of the intertubercular groove demonstrating an "empty groove sign" (star) suggesting the bicipital tendon has either dislocated or had a full thickness tear.
Deltoid: Deltoid muscle; Humerus: humerus bone. Left: medial; Right: lateral; Bottom of screen: deep; Top of screen: superficial.
Courtesy of Jonathan Finnoff, DO. Used with permission of Mayo Foundation for Medical Education and Research. All rights reserved.