Scorpio NRG (eNeRGize) Cruciate Retaining (CR) Post-market International Outcome Study

Inclusion Criteria

• Patient is able to understand the meaning of the study and is willing to sign the Ethic Commission approved, study specific Informed Patient Consent Form.
• The subject is a male or non-pregnant female between 40 and 75 years of age.
• The subject requires a primary total knee replacement.
• Patients with osteoarthritis or posttraumatic arthritis (no rheumatoid arthritis)
• The subject has intact collateral ligaments.
• The subject is willing and able to comply with postoperative scheduled clinical and radiographic evaluations and rehabilitation.
• The subject is capable of understanding the patient scores in the national language.

Exclusion Criteria

• The subject is morbidly obese, defined as Body Mass Index (BMI) of > 40.
• The subject has a history of total or unicompartmental reconstruction of the affected joint.
• The subject will be operated bilaterally.
• Patients who had a Total Hip Arthroplasty (THA) on contralateral and/or ipsilateral side within the last year that is considered to have an unsatisfactory outcome (Patients with contralateral and/or ipsilateral THA > 1 year ago with good outcome can be included in the study).
• Patients who had a Total Knee Arthroplasty (TKA) on contralateral side within the last 6 months that is considered to have an unsatisfactory outcome. (Patients with contralateral TKA > 6 months ago with good outcome can be included in the study).
• Patients who will need lower limb joint replacement for another joint within one year.
• The subject has had a high tibial osteotomy or femoral osteotomy.
• The subject has a neuromuscular or neurosensory deficiency, which would limit the ability to assess the performance of the device.
• The subject has a systemic or metabolic disorder leading to progressive bone deterioration.
• The subject is immunologically suppressed or receiving steroids in excess of normal physiological requirements.
• The subject's bone stock in compromised by disease or infection which cannot provide adequate support and/or fixation to the prosthesis.
• The subject has had a knee fusion to the affected joint.
• The subject has an active or suspected latent infection in or about the knee joint.
• Proven or suspected hypersensitivity to one or more than one of the device materials (see Appendix 10 table of chemical composition).
• Female patients planning a pregnancy during the course of the study.
• The subject is a prisoner.
• severe deformities: varus/valgus deformity >10° (mech. axis), bowed femur > 20 degree, flexion contracture >10°