Correct answer:

This is an alternative name for subcutaneous emphysema. In the context of rib fractures, the rib tears the overlying soft tissues and allows air to enter the subcutaneous tissues, resulting in subcutaneous emphysema. The skin over the trunk, neck and sometimes face gives a peculiar crackling feel to the examining fingers (crepitation) and, in severe cases, the face and neck may become grossly swollen. The alternative name, surgical emphysema, is misleading as it is rarely caused by surgeons.