A
Adequate soft tissue coverage despite extensive laceration or flaps
B
Extensive soft tissue loss with periosteal stripping and bone exposure
C
Open fracture associated with an arterial injury requiring repair
D
Open fracture with a clean wound less than 1 cm long
Explanation:The correct option is 'a'. The Gustilo-Anderson classification is used to grade open fractures. Type IIIA is characterized by extensive soft-tissue laceration, adequate bone coverage, and segmental fractures, gunshots, or farm injuries, but importantly, there is adequate soft tissue coverage of the fractured bone despite the extensive laceration or flaps. Type IIIB (option b) involves extensive soft tissue loss requiring local or free flap coverage. Type IIIC (option c) involves an arterial injury requiring repair. Type I (option d) is a clean wound <1cm.
Reference: Gustilo RB, Anderson JT. Prevention of infection in the treatment of one thousand and twenty-five open fractures of long bones: retrospective and prospective analyses. J Bone Joint Surg Am. 1976;58(4):453-458.