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Superficial wound complications have been consistently implicated in the development of prosthetic joint infection. This cohort study aimed to determine perioperative risk factors associated with superficial wound complications. The study was performed over an 18-month period (January 2011 to June 2012) and included 964 patients undergoing prosthetic hip or knee replacement surgery. The factors associated with superficial wound complication differed according to arthroplasty site. In the combined cohort the following factors were associated with superficial wound complications: the use of 0.5% chlorhexidine in 70% alcohol for surgical skin preparation compared with 1% iodine in 70% alcohol (odds ratio (OR) 4.75; 95% confidence interval (CI) 1.42, 15.92; p = 0.012); increasing age (OR, 1.13; 95% CI, 1.06,1.19; p 0.18); increasing body mass index (BMI) (OR, 1.08; 95% CI, 1.05,1.12; p < 0.001); rheumatoid …