The crepitus - A grating sound or sensation caused by rough surfaces inside the body rubbing together. Crepitus may be felt or heard when the ends of a broken bone rub against each other, or when cartilage on the surfaces of a joint has worn away due to osteoarthritis.

Faint crepitus may be heard in the lung due to abnormalities such as inflammation in pneumonia. The term also describes the crackling sound made when an air pocket under the skin (see emphysema, surgical), or an area of gas gangrene, is pressed.


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