Saffari M, et al. - Authors assessed the effectiveness of an intervention based on a theory of planned behaviour (TPB) in improving health-related quality of life in middle-age and older adults with this condition. They recruited 120 patients diagnosed with knee/hip OA from a general hospital. At baseline, the measures administered were the SF-12, EuroQol (EQ-5D), Osteoarthritis Knee and Hip Quality of Life (OAKHQoL), and TPB questionnaire. As per data, in patients with knee/hip OA this TPB-based intervention was effective in improving HRQoL and several clinical parameters.