These authors sought to determine if there is a temporal relationship between corticosteroid injections and the risk of surgical site infection after arthroscopic rotator cuff repair.
They reviewed the PearlDiver database for patients undergoing arthroscopic rotator cuff repair from 2007 to 2016. Patients were stratified into 2 cohorts: those undergoing arthroscopic rotator cuff repair within 1 year of injection (n = 12,060), and those undergoing arthroscopic rotator cuff repair without prior injection (n = 48,763). Patients with preoperative injections were further stratified by the duration in months that the injection was performed prior to the surgical procedure.
There was no significant difference in the incidence of surgical site infection in patients receiving a shoulder injection at 0.7% compared with the control cohort at 0.8% (odds ratio [OR], 0.9 [95% confidence interval (CI), 0.7 to 1.1]; p = 0.2). However, patients receiving an injection within 1 month prior to operative management had a significantly higher rate of surgical site infection overall at 1.3% compared with the control group at 0.8% (OR, 1.7 [95% CI, 1.0 to 2.9]; p = 0.04). On multivariate analysis, male sex (OR, 1.7 [95% CI, 1.4 to 1.9]; p = 0.001), obesity (OR, 1.4 [95% CI, 1.2 to 1.6]; p < 0.001), diabetes (OR, 1.3 [95% CI, 1.1 to 1.5]; p < 0.001), smoking status (OR, 1.7 [95% CI, 1.4 to 1.9], p < 0.001), and preoperative corticosteroid injections within 1 month of the surgical procedure (OR, 2.1 [95% CI, 1.5 to 2.7]; p < 0.001) were independent risk factors for development of a surgical site infection.
The authors concluded that injections within 1 month of arthroscopic rotator cuff repair significantly increases the risk of surgical site infection. However, there is no increased risk of infection if the surgical procedure is delayed by 1 month following an injection.
Comment: This is an important study pointing to recent steroid injections as a risk factor for infection after arthroscopic cuff repair. It would be of interest to know the organisms responsible for these infections. As the authors point out, infections with Cutibacterium may not have been recorded in the database because of their subtle presentation (pain and stiffness).
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