Fig. 5From: A novel ultrasound scanning approach for evaluating femoral cartilage defects of the knee: comparison with routine magnetic resonance imagingExample of a false-positive case. a The case was diagnosed as grade 3 cartilage defect on the trochlear surface (black arrow), presenting as blurred margin, lack of clarity, and overt local thinning (> 50% of cartilage depth). b On AS, the diagnosis was grade 0, i.e., normal cartilage (black arrow)Back to article page