352 patients with knee osteoarthritis and scheduled to undergo total knee arthroplasty (TKA) were randomized to receive either a fixed or mobile bearing tibial component. Patients were further randomized to undergo patellar resurfacing or to have the patella retained. The purpose of this study was to compare these implants in terms of clinical outcomes. Results at 2 years indicated that patients who underwent TKA using mobile bearings displayed comparable knee function (i.e. Oxford Knee Scores, American Knee Society scores, and range of motion) and SF-12 health survey scores, versus those who received fixed bearings. Furthermore, these outcomes were also comparable whether or not the patient received patellar resurfacing.