533 One Stage versus Two Stage Treatment for Prosthetic Joint Infection: A Prospective, Randomized Trial

534 Trends in Extended Oral Antibiotic Prophylaxis After Primary Total Knee Arthroplasty

536 Double DAIR for Acute-PJI: Positive Culture at Second Stage Increases the Risk of Subsequent Failure

537 Cefazolin in Total Knee Arthroplasty Provides Adequate Serum Levels but Insufficient Tissue Protection For All Pathogens: A Prospective Trial