What does a positive Piano Keys Test indicate?

A positive Piano Keys Test indicates instability of the distal radioulnar joint. This test is used to assess the integrity and stability of this particular joint, which connects the distal ends of the radius and ulna in the forearm. When performing the Piano Keys Test, if a significant movement or 'piano key' motion is observed, it suggests that the joint is unstable, likely due to ligamentous injury or a disruption in the joint structure.

In this test, the practitioner typically pushes down on the ulnar head and observes the degree of movement. If there is a pronounced shift or further mobility of the joint, it is indicative of a potential instability, which can affect overall wrist function and stability. The other options listed, while related to wrist and forearm injuries, do not specifically correspond to the implications of a positive result from the Piano Keys Test.