2.6K views · 13 reactions | �The ballottement test� for the knee, also called � the patellar tap test �is a physical examination used to detect significant joint effusion (swelling). �compressing the knee joint to move fluid and then tapping the patella to see if it "floats" or rebounds, which is a positive sign indicating fluid buildup. . . . . follow us on Instagram @anum7933 #physiotherapy #dpt #fyp #fbpage #explore #rehabgoals #kneeinjury #therapist | DrAnum Tariq | Facebook