This is a prospective, single-time point study that will be conducted in the US.To compare outcomes of these two study groups, this study will include routine office questionnaires such as the Knee Society Score (KSS) and the Knee Injury and Osteoarthritis Outcome Score (KOOS).The functional testing used in this study consists of tests that physical therapists use daily as objective methods to assess patients' functional status. The testing is designed to closely mimic daily activities with which the subjects are familiar.