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Power Doppler ultrasound of synovitis. Score 0: no color blood flow signal (TP-SLN group, (A). Score 1: dot color blood flow signals (TP group, (B)). Score 2: short linear color blood flow signal with distribution less than 1/2 of synovial area (DMSO group, (C)). Score 3: reticular blood flow signals distributed more than 1/2 of synovial area (control group, (D)).
