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Fig. 1B —Sonograms of normal shoulder and shoulders with impingement.
(See also Figs. S1A-S1C, videos, in supplemental data online.) 49-year-old man
with soft-tissue impingement during dynamic sonography evaluation of shoulder.
Coronal sonography view of left shoulder with subacromial impingement, during
active elevation of arm halfway between flexion and abduction with hand in
pronation, shows pooling of fluid in lateral aspect of subacromial-subdeltoid
bursa (arrow) and mild impingement of supraspinatus tendon
(arrowhead) as greater tuberosity (T) of humeral head approximates
anterior one third of acromion (A). Note that humeral head remains in anatomic
position, below acromion.
