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Fig. 2A. 47-year-old man with surgically proven rupture and retraction of
distal biceps tendon. Longitudinal sonogram of contralateral normal right
elbow shows distal biceps tendon (short arrows) inserting on
bicipital tuberosity (long arrow). Distal aspect of tendon has areas
of decreased echogenicity due to anisotropy. Note radial head (H) and radial
neck (N).