Anatomic Congruent Prosthetic Knee Design

Inclusion Criteria: * Informed and written consent. * Primary knee osteoarthritis in capable men and women. * Indication for cruciate-retaining total knee arthroplasty. Exclusion Criteria: * Patients who do not speak and read Danish. * Patients who are pregnant or at risk of becoming pregnant during the project. * Patients with active cancer and/or radiation or chemotherapy. * Patients who are alcoholics or have some form of abuse that impede information and follow-up. * Patients with severe psychiatric disease that might complicate compliance with follow-up. * Patients with surgically implants in the affected leg and/or pace maker. * Patients with greater thigh circumference then 60 cm. * Patients cannot perform the described exercises. * Patients with knee instability due to multiligament injury. * Patients with conditions that severely compromise their gait other than knee osteoarthritis in the affected knee. * Patients with severe fracture sequelae or severe malalignment at knee level. * Patients with osteosynthesised fractures using bone graft at knee level. * Patients with need of an augmentation and/or stem-elongation. * Patients with metabolic bone disease. * Patients with rheumatoid arthritis.