The number of knee total arthroplasty (ART) interventions has increased in the last 10 years in European countries, partly due to the aging of the population and partly because of the increase in the use of these interventions to improve the quality of life among elderly patients. According to the Organization for Economic Cooperation and Development (OECD) 2012, from 2000 to 2010 in Spain the percentage of knee ART has doubled in recent years. .~The role of citizens in decisions affecting their health is changing. Individual factors such as improving educational attainment and access to medical information, and collective factors such as training of patient groups and changes in legislation (informed consent, autonomy principle) have motivated the transition from a paternalistic model to a co-responsibility model. Shared decision-making (TDC) has been proposed in recent years as a model of care that promotes users' involvement in the decisions about their treatment, in those situations where there is uncertainty and / or the scientific evidence reports a balance between benefits and risks that is similar for two or more therapeutic options. Decision aids (DA) are tools designed to promote and facilitate patients' involvement in medical decisions concerning their health~Objectives:~To assess the effectiveness of a DA for patients with knee osteoarthritis candidates to ART~Methodology:~Randomized controlled trial to evaluate the effectiveness of the DA versus usual care in reducing decisional conflict, increasing knowledge of the disease/treatments, informed choice and the satisfaction with the decision making process, and decreasing decisional regret.
The main goal of this study is assess the effectiveness of a DA for patients with knee osteoarthritis candidates to ART