P0637 The Resurfaced Versus Unsurfaced Patella: A 7-Year Retrospective Analysis

P0638 Kinematics Comparisons of Patella Alta with the Normal Patella after Total Knee Arthroplasty

P0639 The Keel Plays a Role in Periprosthetic Fractures of the Tibial Component in Cementless Unicompartmental Knee Replacement

P0640 Tibial Stems in Primary Total Knee Arthroplasty for Obese Patients: Analysis of Data from a Large National Arthroplasty Registry

P0641 Minimum 5-Year Clinical Outcomes and Survivorship for a Single Revision Total Knee Arthroplasty System Using Hybrid Fixation and Press-Fit Stems