Define the term "Ballottement" in the context of wrist assessment.

Ballottement refers to a clinical assessment technique used to evaluate the integrity of the wrist joint and its components, particularly in assessing the presence of effusion or fluid accumulation around the joint. In this context, the correct choice describes how ballottement involves the passive movement of unengaged bones within the wrist. By gently pressing on the carpal bones or the wrist joint space, a clinician can detect subtle movements or changes that indicate whether structures are intact or if there is swelling. This technique allows the practitioner to assess the wrist's stability and the mechanical relationships between the bones, which is crucial for diagnosing various conditions such as wrist sprains or joint effusions.

The other options do not accurately encapsulate the concept of ballottement. Active movement pertains to voluntary muscle contractions and joint motions performed by the patient, rather than an assessment technique performed by a clinician. Direct manipulation of the carpal bones may suggest a more invasive intervention rather than the gentle, passive nature intended in ballottement. Finally, while assessing wrist extension is a part of evaluating joint function, it doesn't specifically relate to the ballottement technique.