The primary objective of delayed primary wound closure in contaminated injuries is to minimize the risk of wound infection. This technique involves initially leaving the wound open to allow for adequate drainage and reduction of bacterial load through regular cleaning and debridement. Only once the wound is deemed clean, usually after 3-5 days, is it closed surgically, thereby reducing the chance of infection that could arise from closing a contaminated wound prematurely. This approach balances the benefits of primary closure against the risks of infection seen with immediate closure in contaminated wounds.

Reference: Bailey & Love’s Short Practice of Surgery, 27th Edition.