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