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Fig. 2. —Longitudinal sonogram of normal triangular fibrocartilage in 32-year-old healthy male volunteer. Striated appearance of extensor carpi ulnaris tendon (curved solid arrows) is readily apparent. This tendon acts as acoustic window. Homogeneous, hyperechoic triangular fibrocartilage is outlined by straight solid arrows and lies between distal ulna (straight open arrow) and triquetral bones (curved open arrow). Deep radial portion of ligament is poorly visualized, a limitation of this technique.