Scorpio Non Restricted Geometry (NRG) Study in Japan

Inclusion criteria

• Patient who is candidate for primary total knee arthroplasty (TKA).
• Patient who has diagnosis of osteoarthritis or rheumatoid arthritis.
• Patient who is age 20 or over.
• Patient who signed an Institutional Review Board (IRB)-approved, study specific Informed Patient Consent Form.
• Patient who is willing and able to comply with postoperative scheduled evaluations.

Exclusion criteria

• Patient who has a bacterial infectious disease or has a risk high of a bacterial infection.
• Patient who requires revision surgery.
• Patient who is morbidly obese, defined as having a Body Mass Index (BMI) > 40.
• Patient who is or may be pregnant female.
• Patient who has a neuromuscular or neurosensory deficiency, which limits ability to evaluate the safety and efficacy of the device.
• Patient with diagnosed systemic disease (i.e. Paget's disease, renal osteodystrophy).
• Patient who is immunologically suppressed or receiving chronic steroids.
• Patient who is judged ineligible with specific reason by primary doctor.