_____ wounds are almost always contaminated because they are caused by external forces and often occur in environments that are mildly or grossly contaminated

• A. Trauma
• B. Cardiac/vascular
• C. Autograft
• D. Debridement

Answer: (A)

Traumatic wounds are exposed to the outside environment, so they are almost always contaminated by dirt, debris, bacteria, and other contaminants encountered during the injury. The mechanism—external forces that create an open wound—puts these wounds at high risk for contamination, sometimes mildly so and sometimes grossly so, depending on the surroundings and what the wound has contacted.

Other options don’t describe a wound type defined by external contamination. Cardiac/vascular injuries are about location and mechanism rather than the typical contamination load of the wound; they can be clean or contaminated but aren’t classified by environment-driven contamination. An autograft is tissue transferred from the patient to the same patient, which is a procedure or tissue type rather than a wound category. Debridement is the surgical removal of dead or nonviable tissue, not a description of a wound's likelihood of contamination.