Ballottement

While maintaining pressure with the first hand, use the index finger of the other hand to sharply push the patella downward toward the femur (thigh bone). Findings:

This is the most frequent use of the term. It is used to identify a "floating" kneecap, which indicates a moderate-to-large accumulation of fluid (effusion) within the knee joint.

Performed by applying a sharp tap to the abdominal wall to feel the fetus move away and return. 3. Abdominal Ballottement