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Ultrasound examination of knee cartilage. A: Left knee. Flexion position. Anterior transverse view. Note trochlear cartilage of femur. The hyaline cartilage is a hypoechoic homogenous structure with sharp margins, overlying the bright hyperechoic line of subchondral bone; B: Cartilage lesion. Anterior transverse right knee in flexion, irregularity and narrowing of the hyaline cartilage which is roughened and fibrillated.
