Antioxidant-Loaded Highly Cross-Linked Polyethylene in Total Knee Arthroplasty: The Need for Radiostereometric Randomized Controlled Trials: Commentary on an article by Heather A. Prentice, PhD, et al.: " Antioxidant-Loaded Highly Cross-Linked Polyethylene May Reduce Revision Risk in Total Knee Arthroplasty. A U.S.-Based Cohort Study "