Comparing X-3 To N2vac Polyethylene With the Triathlon Total Knee System

Methodology: This study will be a randomized, multi-center evaluation comparing N2vac polyethylene inserts and patellas with X3 inserts and patellas when used in the Triathlon PS total knee system. Study Duration: 12-18 month enrollment period + 10 year follow-up for each case years total duration Multi-centre study Objectives Primary: To compare the 10 year implant survival of the Triathlon PS total knee system when X3 polyethylene components are used to the same knee system when N2Vac components are used. Secondary: To compare pain, function, radiographic outcomes, and health related quality of life of subjects in both treatment groups. Safety will be assessed by comparison of adverse events between the groups. Number of Subjects 384 cases (197 each group)