volume 115, issue 1, P49-54 1975
DOI: 10.1148/115.1.49
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Abstract: Anteroposterior and lateral knee radiographs were obtained prior to arthrography in 200 patients. Presence and quantity of joint effusion were recorded, and radiologic criteria for the presence or absence of knee effusion were evaluated. Only the lateral projection was of value in assessing joint fluid. The fat pad separation sign was the most accurate indicator of fluid and effusions as small as 1-2 ml were recognized. There were accuracies of 88% in the diagnosis and 90% in the exclusion of knee effusions. S…

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