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Elastographic (top) and B-mode images (bottom) of the middle portion of the superficial medial collateral ligament (MCL) at 0° knee flexion. The strain indicator and the strain ratios of the ligament and coupler are displayed. The ROI of the acoustic coupler (width, 4 cm; height, 0.5) is indicated as a yellow rectangle, and the ligament portion (length, 2 cm) is outlined in yellow.
