Shoulder ultrasound.

Ultrasound is used increasingly in the investigation of the rotator cuff. It is as accurate as magnetic resonance imaging in the detection of rotator cuff tears and the assessment of tear size and can demonstrate atrophy and fatty infiltration in the rotator cuff muscles. This article reviews the anatomy and technique of shoulder ultrasound, the ultrasound findings in rotator cuff disease, the accuracy of ultrasound and magnetic resonance imaging in the assessment of rotator cuff tears and the role of interventional ultrasound of the shoulder.