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To investigate factors associated with the development of deep infection in patients with open fractures of the radius and/or ulna.

We retrospectively reviewed 296 open fractures of the radius and/or ulna. Of these patients, 200 had at least 6-month follow-up and were included in this study. The following variables were examined for each patient: time from injury to antibiotic administration, time from injury to operative debridement, Gustilo–Anderson classification, type of antibiotic received, and host characteristics such as age, diabetes, and tobacco use. Outcome parameters included the presence of deep infection and fracture union.

The overall rate of deep infection was 5% (10 of 200). No type 1 fractures (of 41) developed deep infection. In contrast, 4% (2 of 48) of type 2 and 7% (8 of 110) of type 3 fractures developed infection. Of 200 patients, 28 received antibiotics in less than 3 hours and …