Does Marijuana Smoking Increase the Odds of Surgical Site Infection after Orthopaedic Surgery? A Retrospective Cohort Study

Abstract

Does marijuana smoking increase the risk of surgical site infection (SSI) after open reduction and internal fixation of fractures? Retrospective Single academic level 1 trauma center in Southern California Adult patients who underwent open treatment for closed fractures between January 2009 and December 2021, had hardware placed, and had at least 6 months of postoperative follow up. Risk factors associated with the development of SSI were compared between current inhalational marijuana users and non-marijuana users. Complete data was available on 4,802 patients after exclusion of 82 who did not have a complete variable set. At the time of surgery 24% (1,133 patients) were current users of marijuana. At final follow up (minimum 6 months), there was a 1.6% infection rate (75 patients). The average age of the infection free group was 46.1 ± 23.1 and the average age of the SSI group was 47.0 ± 20.3 (p=0.73). 2,703 (57%) in the infection free group were male compared to 48 (64%) in the SSI group (p=0.49). On multivariate analysis, longer operative times (OR 1.002 [95% CI: 1.001-1.004]), diabetic status (OR 2.084 [95% CI: 1.225-3.547]), and current tobacco use (OR 2.493 [95% CI: 1.514-4.106]) (p<0.01 for all) were associated with an increased risk of SSI; however, current marijuana use was not (OR 0.678 [95% CI: 0.228-2.013], p=0.48). Tobacco use, diabetes, and longer operative times were associated with the development of SSI after open reduction and internal fixation of fractures; however, marijuana smoking was not shown to be associated with the development of SSI. Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.