The concept of quality of life has been widely developed over the last two decades. As they provide subjective assessment of health, quality of life measures may be broadly and relevantly applied in many areas. Numerous measures are available today to perform discriminative, evaluative or analytical studies in the epidemiological, the therapeutic or the health economic fields. Such measures are increasingly used and may be added to clinical, biological or radiographical criteria to assess medical benefits and health outcomes in order to strengthen decisional choice in health.