488 Fifty Years of Progress: Trends in Survivorship and Failure Mechanisms in over 42,000 Primary THAs

517 PJI Risk Increases with Successive Aseptic Revision TKAs: 4000 Cases with Long-Term Follow-Up

520 Unexpected Positive Cultures in 183 Aseptic Revision TKA: Low Risk of PJI at Midterm Follow-Up

522 Two-stage Exchange TKAs for PJI After Failed DAIR were Associated with High Reinfection Rate: Long-term Outcomes In 246 Cases