What is characterized by involuntary, rapid irregular jerky movements involving multiple joints?

The characteristic of involuntary, rapid irregular jerky movements involving multiple joints is best described by the term "chorea." This condition is associated with Huntington's Disease, where the hallmark symptoms include these unintentional, dance-like movements that can affect various parts of the body.

Chorea arises from dysfunction in the basal ganglia, which is involved in the regulation of movement. The movements are often fluid and may appear to be abnormal, irregular, and unpredictable, leading to challenges in coordination.

While Huntington's Disease encompasses a broader range of symptoms, including cognitive decline and emotional changes, the specific aspect of rapid jerky movements directly aligns with the definition of chorea. Thus, although Huntington's Disease is the context for the movements, it is chorea that defines the specific movement pattern described in the question. Recognizing the distinction between the disease and the particular movement disorder is crucial for understanding the clinical picture.