

Brush Test, also known under the names Stroke Test, Bulge Test or Swipe Test is an orthopedic test to assess minor knee swelling.
According to a study by Sturgill et al. (2009), this test has a substantial degree of reliability with a Kappa value of k= 0.75.
For this reason, we give this test a moderate clinical value in practice.
Agreement was scored when two raters scored the same grade or one grade apart (see below for details).
Execution:
Positive Outcome: A wave of fluid floating down the medial and distal side of the knee where it bulges mediodistally indicates a joint effusion
Another test to assess for swelling in the knee joint is the Patellar Tap Test / Ballotement Test.