Background: Prosthetic joint infection (PJI) caused by Acinetobacter baumannii (Ab) has become a growing concern due to its overwhelming ability to express resistance to antibiotics and produce biofilm. Aim: This study aimed to identify independent risk factors (RFs) associated with Ab-PJI and its role in the treatment outcome. Methods: Single-center retrospective, cohort study of PJI patients diagnosed between January 2014 and July 2018. PJI diagnosis was based upon MSIS 2018 criterium. To estimate RFs associated with Ab-PJI, multivariate analyses with level of significance of p < 0.05 was performed. To evaluate treatment failure, the Kaplan–Meier (KM) analysis and log-rank test was performed.Results: Overall, 98 PJI cases were assessed, including 33 with Ab-PJI and 65 with PJI due to other microorganisms (Non-Ab-PJI). Independent RFs associated with Ab-PJI were revision arthroplasty (odds ratio [OR] = 3.01; 95% confidence interval [95% CI] = 1.15–7.90, p = 0.025) and non-elective arthroplasty (OR = 2.65; 95% CI = 1.01–7.01, p = 0.049). Ab-PJI was also more likely to be classified as a chronic late infection (OR = 5.81; 95% CI = 2.1–16.07, p = 0.001) than Non-Ab-PJI. Ab-PJI was not associated with treatment failure (p = 0.557). Conclusions: Late chronic infections, surgical revision, and non-elective arthroplasty are well-known predictors of PJI, but were also independently associated with Ab-PJI. High selective pressure imposed by misuse of antibiotics is likely to have played a role. Infections caused by Ab and surgical treatment with DAIR were not associated with PJI treatment failure. Trial registration: Study data supporting our results were registered at an open access virtual platform for registration of studies on humans performed in Brazil. The Brazilian Registry of Clinical Trials (ReBEC) http://www.ensaiosclinicos.gov.br/rg/RBR-6ft5yb/Register Number: RBR-6ft5yb