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Fig. 1C —Sonograms of normal shoulder and shoulders with impingement.
(See also Figs. S1A-S1C, videos, in supplemental data online.) 43-year-old man
with upward migration of humeral head during dynamic sonography evaluation of
shoulder. Coronal sonography view of left shoulder with shoulder impingement
syndrome, during active elevation of arm halfway between flexion and abduction
with hand in pronation, shows abnormal upward migration of humeral head (H) in
regard to acromion (A), preventing its passage underneath acromion. There is
mild distention of subacromial bursa (arrowhead). S = supraspinatus
tendon.
