Study Design. Retrospective case series. Objective. We sought to identify risk factors associated with surgical site infection (SSI) after posterior long segment spinal fusion (PLSF). Summary of Background Data. Patients who undergo PLSF may be at elevated risk of SSI. Identifying factors associated with SSI in these operations can help risk stratify patients and tailor management. Methods. We analyzed PLSFs—seven or more levels—at our institution from 2000 to 2015. Data on patients' clinical characteristics, procedural factors, and antimicrobial management were collected. Multivariable analysis identified factors independently associated with outcomes of interest. Results. In 628 cases, SSI was associated with steroid use (P = 0.024, odds ratio [OR] = 2.54) and using cefazolin (P
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