comparison the percentage of detection of periarthritis in patients with rheumatoid arthritis using clinical examination or ultrasound methods

background: this study aimed to compare the percentage of detection of periarthritis in patients with rheumatoid arthritis using clinical examination and ultrasound methods. materials and methods: this study is a cross?sectional study which was conducted in al?zahra hospital (isfahan, iran) during 2014–2015. in our study, ninety patients were selected based on the american college of rheumatology 2010 criteria. all patients were examined by a rheumatologist to find the existence of effusion, and the data were filled in the checklist. the ultrasonography for detecting effusion in periarticular structures was done by an expert radiologist with two methods, including high?resolution ultrasonography and power doppler. the percentage of effusion existence found by physical examination was compared by sonography, and the chi?square and t ?tests were used for data analysis. results: the percentage of effusion found in areas with physical examination by rheumatologist was lower than the frequency distribution of effusions found by sonography (8.3% vs 14.2%) ( p < 0.001). in sonography, rotator cuff tendonitis is the most common periarthritis. other findings in sonography were biceps tendinitis (10 cases), wrist tendonitis (13 cases), olecranon bursitis (9 cases), golfers elbow (4 cases), tennis elbow (4 cases), trochanteric bursitis (6 cases), anserine bursitis (6 cases), prepatellar bursitis (11 cases), and ankle tendonitis (7 cases). tenderness on physical examination was found in 15% of the cases, and the evidence of periarthritis was found in 21/7% through sonography ( p < 0.001) and 34% through doppler sonography ( p < 0.001). conclusion: the percentage of periarthritis detection by ultrasonography and power doppler sonography was higher than clinical examination. hence, the ultrasonography is more accurate than physical examination.