What is the accuracy of ultrasonography for septic arthritis (SA) imaging?

Updated: Sep 19, 2019
  • Author: Lourdes Nunez-Atahualpa, MD; Chief Editor: Felix S Chew, MD, MBA, MEd  more...
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In a retrospective study that evaluated 158 patients for joint effusion of the knee, US showed an 81.3% sensitivity and a 100% specificity, with a positive predictive value of 100% and a negative predictive value of 77.5% when compared to MRI. [38]  In the hip, US showed a specificity of 80%, sensitivity at 96.3%, positive predictive value of 94%, and negative predictive value of 85.7% when compared to surgical results and further follow-up. This prospective study further suggested that US is superior to clinical, laboratory, and plain radiography parameters for the detection of septic arthritis in patients with a mean age of 45 days. [39]

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