Crepitus is a medical term to describe the grating, crackling or popping sounds and sensations experienced under the skin and joints.
The sound can be created when two rough surfaces in the human body come into contact - for example, in osteoarthritis when the cartilage around joints has eroded away and the joint ends grind against one another, or when the fracture surfaces of two broken bones rub together. This makes the presence of crepitus a useful and common (albeit painful) definitive symptom of bone fracture.
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