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PD FS sagittal in a 48-year-old female shows a linear low signal in lateral femoral cartilage, perpendicular to the subchondral bone on T2 weighted images, located in morphologically normal appearing cartilage suggest” cartilage black line” sign. (b, c) PD FS images of another 54-year-old female with focal T2 hypointense chondral signal involving patellar cartilage with smooth overlying chondral surface could represent early chondral degeneration.
