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67-year-old female who had right knee pain with difficulty in walking diagnosed with osteoarthritis. Ultrasound of the right knee shows normal thick cartilage at the level of the lateral femoral condyle, hypoechoic, elongated structure (a, white arrows), and loss of cartilage at the medial femoral condyle (b, between red arrows). Such a finding is suggestive of severe osteoarthritis.
