Cartilage interface sign

Cartilage interface sign, also referred as "double cortex sign", refers to the sonographic presence of a thin markedly hyperechoic line at the interface between the normally hypoechoic hyaline articular cartilage of the humeral head and an abnormally hypoechoic supraspinatus tendon, due to the marked difference in acoustic impedances of the two tissues at the interface 1.The sign indicates the presence of partial or complete supraspinatus tear with fluid replacing the fibres and has been shown to be 100% specific 2.  The sign, however, is not often present and has a low sensitivity for supraspinatus tear, around 30% 2.

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