Which test specifically demonstrates the presence of edema?

The Patella Tap Test is designed specifically to assess the presence of effusion (edema) in the knee joint. During this test, a gentle tapping over the patella is performed, and the response is observed. If there is significant fluid accumulation in the joint capsule, the patella will float or move more than it would in a knee with normal synovial fluid levels. This test is particularly useful for clinicians to identify swelling, which can aid in diagnosing conditions such as arthritis or joint injuries.

The other tests mentioned in the options do not primarily focus on identifying edema. For instance, Appley's Test is used for assessing meniscal injuries, while the McMurray's Test evaluates the integrity of the meniscus as well, particularly through rotation and compression. The Heel Height Test is a more indirect measure typically related to leg length discrepancies rather than directly assessing edema in a joint. Thus, the Patella Tap Test is the most specific and effective in demonstrating edema in the knee.