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Fig. 1C —Shoulder impingement syndrome. Sonogram (left) and photograph (right) of dynamic maneuver technique; see text for explanation of maneuver. There is complete passage of tendon and subacrominal-subdeltoid bursa under acromion. For video see supplemental Figures S1B and S1C. In both maneuvers, video of sonogram shows smooth gliding of tendon and subacrominal-subdeltoid bursa under acromion.