crepitation

noun
crep·​i·​ta·​tion | \ ˌkrep-ə-ˈtā-shən How to pronounce crepitation (audio) \

Medical Definition of crepitation

: a grating or crackling sound or sensation (as that produced by the fractured ends of a bone moving against each other or as that in tissues affected with gas gangrene) crepitation in the arthritic knee