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The patella feels like it is "floating." You will feel it move through fluid, click against the femur, and then rebound or "ballotte" back toward your finger.

Suspected knee trauma, arthritis flare-up, or unexplained swelling. Technique:

(from the French ballotter , meaning "to toss about") is a medical physical examination technique used to detect floating objects within a fluid-filled cavity. It is most commonly applied in orthopedics to check for knee swelling, in obstetrics to assess pregnancy, and in general medicine to evaluate abdominal organs. 1. Patellar Ballottement (Knee Effusion Test)