Fig. 4From: Broken-fat pad sign: a characteristic radiographic finding to distinguish between knee rheumatoid arthritis and osteoarthritisReceiver operating characteristic analysis of the two radiologists and each evaluation process. a Reader 1 with 8 years’ experience, with AUC increased from 0.58 to 0.76. b Reader 2 with 20 years’ experience, with AUC increased from 0.73 to 0.80. AUC, area under the curveBack to article page