Study of Surgical Technique With Use of Single-radius Prosthesis in Total Knee Replacement

Inclusion Criteria: * Scheduled to undergo primary total knee arthroplasty performed by the principal investigator * Use of a single radius posterior-stabilized TKA prosthesis is planned * Spinal anesthetic is planned * Diagnosis of osteoarthritis * Has normal knee ligaments with no history of previous injury or surgery to ligaments, or other pathologic condition * Has at least 100 degrees knee flexion preoperatively (measured by long goniometer) * Gives valid informed consent * Age 18 years or older Exclusion Criteria: * Patient receives general anesthetic * Diagnosis other than osteoarthritis (e.g., rheumatoid arthritis, avascular necrosis, post-traumatic arthritis) * History of any prior knee ligament injury, or any surgery to ligaments * Any connective tissue disease affecting integrity of the ligaments (must have normal ligaments) * History of long bone fracture in the affected leg * Flexion contracture that would interfere with ability to establish extension gap reliably (judgment of investigator) * Maximum pre-operative knee flexion is less than 100 degrees. * Patient is non-ambulatory * Any preclusion or inability to use navigation * Treatment with single radius posterior stabilized TKA prosthesis is not indicated * Participation is not in best interest of patient for any reason * Cannot or does not give valid informed consent * Female patient who is currently pregnant * Age less than 18 years * Body mass index greater than 40 kg/(m\*m) * Incarcerated