A Comparative Study of Knee Systems

Inclusion Criteria: * must be scheduled to undergo TKA with no bilateral TKA planned within 6 weeks of the initial surgery date * must be 18 years of age or older * must be capable and willing to provide informed consent * must have flexion contracture less than 15 degrees. * must have ligament stability no more than 2 degrees instability in varus/valgus extension stress Exclusion Criteria: * medical condition or personal circumstances that will prevent participation and completion of the follow-up visits at 3 weeks, 6 weeks and 3 months post-op * currently participating in or has participated in (within 30 days prior to inclusion in this study) another clinical trial of an investigational drug, biologic, device, or procedure * known pre-operative systemic infections, uncontrolled diabetes, or diseases or conditions that are known to interfere with the wound healing process * Knee alignment deformities greater than 7 degrees varus or valgus * known prior knee revisions or previous surgeries deemed to compromise the TKA incision exposure * known medical conditions prohibiting the use of MRI or nickel allergy, sensitivity, or hardware in the region of the knee