What does "crepitation" refer to in a medical context?

In a medical context, "crepitation" refers specifically to the sound produced when the ends of a broken bone move against each other, often described as a crackling or popping noise. This phenomenon occurs when gas bubbles in the joint fluid collapse or when the rough surfaces of fractured bone rub together during movement. It can serve as an important diagnostic sign for healthcare professionals in assessing bone injuries. Understanding this term is crucial as it highlights the auditory clues that can indicate underlying structural problems, specifically in orthopedic assessments. The other listed options describe different medical terms and conditions but do not relate to the sound associated with fractured bones as "crepitation" does.