Usefulness of ultrasound as a predictor of elderly-onset rheumatoid arthritis with polymyalgia rheumatica-like onset

Summary: This study found that ultrasound assessment of the shoulder and knee can help differentiate polymyalgia rheumatica (PMR) from other differential diagnoses and improve the accuracy of the classification criteria for PMR. The presence of tendon/ligament-related lesions in both shoulder and knee was identified as the most important factor in classifying PMR.