111 patients with knee osteoarthritis (Kellgren-Lawrence grade 2-4), were randomized to receive conservative treatment that either entailed behavioral-cognitive therapy in addition to general practitioner care or provided general practitioner care alone. The purpose of this study was to determine if behavioral-cognitive therapy was an effective adjunct to conservative therapy for treating pain, disability and psychological distress caused by knee osteoarthritis. The results indicated that there were no significant differences between the study groups in any of the assessed psychological or physical outcomes and that behavioral-cognitive therapy is not beneficial over standard general practitioner care.