418 Ultracongruent and Posterior-Stabilized Bearings Perform Similarly in Contemporary Total Knee Arthroplasties at Mid-term Follow-up

419 Long-term PROs for Medial and Posterior-stabilized Knee Implants: Concise 10-year Follow Up of a RCT

420 Radiographic and Clinical Comparisons of a Modern Symmetrical versus Assymetrical Implant Design in Primary Total Knee Arthroplasty

421 The Influence of Obesity on the Outcome of Unicondylar Knee Arthroplasty

422 Clinical Outcomes and Economic Implications of Hypoallergenic versus Standard Implants in Total Knee Arthroplasty: A Retrospective Cohort Study