Patients who receive intra-articular knee corticosteroid injections within four weeks of simple knee arthroscopy could increase their risk for postoperative infection, according to a study published online in Arthroscopy. Researchers queried private payer (PP) and Medicare (MC) national insurance databases for patients who underwent simple arthroscopic knee procedures. A total of 5,533 patients were stratified into groups based on when they received an injection: within two (n = 725), four (n = 1,236), six (n = 1,716), or eight weeks (n = 1,856). Infection rates were significantly higher in the two-week group compared to the six- and eight-week groups in both the PP and MC datasets. The four-week group also had significantly higher infection risk compared to the six- and eight-week cohorts. There were no between-group differences in either dataset for the two- and four-week groups.