crepitation

(medicine) A noise produced by the rubbing of fractured ends of bones, by cracking joints, and by pressure upon tissues containing abnormal amounts of air, as in cellular emphysema.

1. A rattling or crackling sound like that made by rubbing hair between the fingers close to the ear.
2. The sensation felt on placing the hand over the seat of a fracture when the broken ends of the bone are moved, or over tissue in which gas gangrene is present.
3. The noise produced by rubbing bone or irregular cartilage surfaces together, as in arthritis.

A dry, crackling sound or sensation, such as that produced by the grating of the ends of a fractured bone.

• respiratory c. — a dry, crackling sound.

The noun has one meaning:

Meaning #1: the sharp sound of snapping noises
  Synonyms: crackle, crackling