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Insights into Imaging
Fig. 3 | Insights into Imaging

Fig. 3

From: Broken-fat pad sign: a characteristic radiographic finding to distinguish between knee rheumatoid arthritis and osteoarthritis

Fig. 3

MRI images of two pairs of patients in our study cohort. The two aligned channels of four patient data (for visualization purpose, we only show the middle sagittal (mid-sagittal) slice of each channel. Purple and red masks are manual ROI for infrapatellar fat pad in patients with rheumatoid and knee osteoarthritis, respectively. a–d Two 54-year-old male patients with knee pain. a, b: RA showed positive broken-fat pad (BFP) sign. c, d OA showed negative BFP. e–h Two 66-year-old female patients with limited knee function. RA patients (e–f) showed positive BFP signs, and OA patients (g–h) showed negative signs

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