All Polyethylene Tibia-VEGA Kiel

Inclusion Criteria: * Patients requiring primary TKA because of severe knee joint conditions that cannot be treated through other therapies; * degenerative osteoarthritis; * rheumatoid arthritis; * posttraumatic arthritis; * symptomatic knee instability; * knee stiffness or deformation of the knee joint; * Age ≥ 18 years; * Patient signed informed consent Exclusion Criteria: * Age younger than 18 years * Any prior joint replacement at the index knee * Unable or unwilling to return for postoperative follow-up * Patient did not sign informed consent * Joint conditions that can be treated by reconstructive surgery (e.g. osteotomy) * Acute or chronic infections near the joint, or systemic infections * Secondary diseases that could influence joint implant functionality * Systemic diseases and metabolic disorders * Severe osteoporosis or osteomalacia * Severely damaged bone structures that could prevent stable implantation of implant components * Bone tumors in the region of implant fixation * Bone malformations, axial misalignments or other bone conditions that rule out implantation of a prosthetic joint * Expected overload on the joint implant, especially due to high patient weight or intense physical strain and activity * Dependency on pharmaceutical drugs, drug abuse, or alcoholism * Fever, infection or inflammation (systemic or local) * Pregnancy * Mental illness * Severe osteopenia (or any other medical or surgical finding) that would preclude any benefit from the implants…