American journal of physical medicine & rehabilitation
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Am J Phys Med Rehabil · Feb 2011
Randomized Controlled TrialDetectable threshold of knee effusion by ultrasonography in osteoarthritis patients.
The aim of this study was to identify the detectable threshold of knee effusion by ultrasonography while infusing saline. ⋯ To detect knee effusion by ultrasonography, infusion of 4.26 ml (SD, 1.92 ml) of solution is needed. We think that a depth of 2 mm is more appropriate than 4 mm as the definition of knee effusion using ultrasonography.