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Fig. 4 —Subjective drawing (not based on cadaveric model) of
subacromial impingement with upward migration of humeral head. Drawing
(coronal plane, cut section) of left shoulder during active elevation of arm
halfway between flexion and abduction with hand in pronation shows upward
migration of humeral head in relation to glenoid cavity, which prevents
passage of greater tuberosity (T) and soft-tissue structures of supraspinatus
outlet beneath acromion.
