Pathognomic signs of fracture is

Pathognomic signs of fracture are Crepitation.
Crepitation refers to situations where noises are produced by the rubbing of parts one against the other. It is 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. It is a condition in which cartilage begins to rub away, leaving bones unprotected and creating inflammation.