Fig. 4

Intra-articular disc (upward and outward oblique transverse plane). a In this patient, the disc was clearly seen (arrows) as a hyperechoic triangular structure in the joint. b In this other patient with the arm alongside the body, the depiction of the disc was less clear. Moreover, intra-articular gas bubbles were associated (arrows). c With antepulsion of the shoulder, the joint fluid (*) and intra-articular disc (arrow) were displaced anteriorly, improving analysis of the disc. C: clavicle, S: sternum