Ultrasonography is a powerful and useful method for the examination of the various shoulder diseases. The use of high-resolution transducer and technical evolution allowed the improvement of the accuracy of detection of the rotator cuff disease. In addition to diagnostic tool, ultrasonography can be applied as an optimal guidance in many intervention therapy around shoulder. However, its limitation is that there is marked disparity between the operators' experience levels. This article describes stepwise methods for evaluating shoulder conditions, ultrasonographic findings of various shoulder pathology, and guidance techniques for intervention therapy.
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