Clinical Study Evaluating the Outcomes of a New Knee System with a Physiological Rollback Mechanism

Inclusion Criteria: 1. Male and females 2. Age 22-80 years 3. Any race 4. Ambulatory patients 5. Patients who have a medical condition with over 5 years of life expectancy 6. Patients requiring knee prosthesis, suitable for the use of Physica KR 7. Patients with painful primary knee osteoarthritis 8. Patients with painful secondary knee osteoarthritis 9. Patients who are suffering from inflammatory arthritis (e.g. rheumatoid arthritis) 10. Patients who have undamaged and functional collateral and posterior cruciate ligaments 11. Patients with a flexion greater than or equal to 90° on the affected side 12. Patients with a fixed flexion contracture less than 10° 13. Patients who understand the conditions of the study and are willing and able to comply with the prescribed rehabilitation and to perform all scheduled follow-up visits 14. Patients who have signed the Ethics Committee approved study-specific Informed Consent Form prior to the surgery Exclusion Criteria: 1. Obese patients with BMI above 35 kg/m2 (severe obesity) 2. Previous partial knee replacement (unilateral, bicompartimental or patellofemoral joint replacement), patellectomy, high tibial osteotomy or femoral osteotomy in the affected knee 3. Primary Total Knee Replacement (TKR) in the affected knee 4. Varus or Valgus deformity greater than 20° 5. Patients with a fixed flexion contracture greater than 10° 6. Previous knee replacement on the contralateral side within the last year and whose outcome is achieving an KSS\< 70 points 7. Patients with symptomatic OA of the hips, spine, ankles, if it can interfere with the evaluation of the target knee 8. Patients with active or any suspected infection (on the affected knee or systemic) 9. Muscular insufficiency or absence of muscoligamentous supporting structures required for adequate soft tissue balance 10. Patients with known or suspicious metal hypersensitivity 11. Recurrent medical history of severe allergic or immune-mediated reactions 12. Vascular insufficiency of lower limbs severe enough to interfere with the study evaluation 13. Current treatment or treatment within the previous 2 years before the screening visit for malignant and life-threatening non-malignant disorders 14. Any clinically significant pathology based on clinical history that the Investigator feels may affect the study evaluation 15. Any intercurrent chronic disease or condition that may interfere with the completion of the 5-year follow-up, such as liver disease, severe coronary disease, alcohol or drug abuse, disordered mental state, or other clinically significant condition 16. Patients who have significant neurological or musculoskeletal disorders or disease that may adversely affect gait and compromise functional recovery and evaluation 17. Patients who have neuromuscular or neurosensory deficit which would limit the ability to assess the performance of the device 18. Patients with systemic or metabolic disorders leading to progressive bone deterioration 19. Patients who have a medical condition with less 5 years of life expectancy 20. Previous organ transplant surgery 21. Any psychiatric illness that would prevent comprehension of the details and nature of the study 22. Participation in any experimental drug/device study within the 6 months prior to the screening visit 23. Female patients who are pregnant, nursing, or planning a pregnancy