[Ultrasound of acute disorders of the shoulder].
Acute pain of the shoulder, with or without associated injury shows specific features that enable differentiation from chronic lesions. Osteo-articular injuries, tendinous lesions, bursitis and moving calcification may produce acute pain. Examination of the acromio-clavicular joint is also essential as acromial lesions are often overlooked in emergency radiology. Along with X-ray radiography, sonography, if adequately performed, is able to determine the etiology of acute pain and to establish lesion staging.