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(English captions by Trisha Paul from the University of Michigan)

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With the patient supine, the leg can be fully extended to assess better for

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joint effusion.

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Compress the suprapatellar pouch, pushing
the contents distally, and assess for

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increased fluid.

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Patellar ballottement can also be performed by
compressing the patella and releasing

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quickly. Observe for rapid rebound, which
also indicates increased fluid pressure.

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If a quicker tap is felt, a larger fusion is present, also called the ballottable

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patella.