(Grafting or crackling sensation imparted to the examining fingers) may be present when the joint contain loose bodies. May communicate with the joints. It is also seen in the following conditions.
Subcutaneous emphysema (surgical emphysema) - gas present in the subcutaneous tissue
Four types :
a. Traumatic - fracture ribs, injury to nasal fossa, breach of continuity of larynx, tracheostomy, fracture skull involving sinuses.
b. Infective - Gas gangrene
c. After fluid administration, closure of surgical wound etc
d. Complicating rupture of oesophagus
Fracture of bones
Extravasation of gas in pneumoperitoneum
Pseudo gas gangrene ( air trapped in the subcutaneous tissue after laparotomy )