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Cartilage interface sign

The cartilage interface 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.1 The sign indicates the presence of partial or complete supraspinatus tear and has been shown to be 100% specific.2  The sign however is not often present and has a low sensitivity for supraspinatus tear of around 30%.2

See also

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