The purpose of this study is to test whether an algorithm for systematic non-surgical treatment consisting of corrective insoles, neuromuscular training, weight loss, patient education and pharmacological treatment with paracetamol, non steroidal anti inflammatory drugs (NSAIDs) and Pantoprazole provides further improvement in pain, function and quality of life than standard non-surgical treatment (information on the disease and how to treat it) in patients with knee osteoarthritis. The H1-hypothesis is that the treatment algorithm results in a greater increase in quality of life and functional capacity and greater reduction in pain than standard treatment at the primary endpoint, which is follow-up 12months after the start of the treatment. See statistical analysis plan available under "Links" for further description of the study.