Delayed wound closure increases deep-infection rate associated with lower-grade open fractures: a propensity-matched cohort study.

BACKGROUND Primary closure of skin wounds after debridement of open fractures is controversial. The purpose of the present study was to determine whether primary skin closure for grade-IIIA or lower-grade open extremity fractures is associated with a lower deep-infection rate. METHODS We identified 349 Gustilo-Anderson grade-I, II, or IIIA fractures treated at our level-I academic trauma center from 2003 to 2007. Eighty-seven injuries were treated with delayed primary closure, and 262 were treated with immediate closure after surgical debridement. After application of a propensity score-matching algorithm to balance prognostic factors, 146 open fractures (seventy-three matched pairs) were analyzed. RESULTS After application of a propensity score-matching algorithm with adjustment for age, sex, time to debridement, American Society of Anesthesiologists (ASA) class, fracture grade, evidence of gross contamination, and a tibial fracture rather than a fracture at another anatomic site, the two treatment groups were compared with respect to the prevalence of infection. Deep infection developed at the sites of three of the seventy-three fractures treated with immediate closure (infection rate, 4.1%; 95% confidence interval [CI], 0.86 to 11.5) compared with thirteen in the matched group of seventy-three fractures treated with delayed primary closure (infection rate, 17.8%; 95% CI, 9.8 to 28.5) (McNemar test, p = 0.0001). CONCLUSIONS Immediate closure of carefully selected wounds by experienced surgeons treating grade-I, II, and IIIA open fractures is safe and is associated with a lower infection rate compared with delayed primary closure.