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(A) US and (B) superposed US images show a longitudinal tear (white arrowhead and grey shade) extending through the entire diameter of the disc (green shade), indicating Class 1D triangular fibrocartilage complex injury. The different color dashed rectangles are in accordance with the transducer positions in Figure 3. US: ultrasound; U: ulna; R: radius; L: lunate; T: triquetrum; ECU, extensor carpi ulnaris.
