The trial will take place at the orthopaedic departments in four hospitals: Haukeland university hospital, Haugesund hospital, Haugesund sanitetsforening rheumatism hospital and Lovisenberg diakonale hospital.The aim is to compare the technical results (implant positioning and stability) for the Profix knee prosthesis, the perioperative morbidity and the clinical and functional results comparing the two strategies. We will also evaluate the health economical aspect through a cost-effectiveness analysis. To complete the project we will analyze data from the Norwegian arthroplasty register with respect to the two different strategies. A doctoral fellowship is part of the project.