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Fig. 1. —25-year-old asymptomatic man. Axial sonogram shows semimembranosus tendon (solid arrow) and medial gastrocnemius tendon (open arrow) with no intervening fluid. Semimembranosus tendon appears artifactually hypoechoic because of anisotropy (normal hyperechoic tendon appears hypoechoic if tendon is not perpendicular to the ultrasound beam). Note that top of image is posterior; left side of image is medial. M = medial gastrocnemius muscle, F = femur.