Despite the considerable amount of knowledge on the physiopathology, epidemiology and risk model of musculoskeletal disorders (MSDs) accumulated the last 20 years, they remain a major cause of work-related diseases in many countries. Multidimensional ergonomic interventions, including a participatory approach and individual, technical and organisational measures, seem to be an appropriate strategy for reducing the physical demands and the symptoms of MSDs,1 2 but evidence of their efficacy is still limited.3 Nevertheless, the scientific understanding of the aetiology of MSDs and their work-relatedness is sufficient to implement effective preventive interventions,1 2 4 as demonstrated by the study of Jensen and Friche5 published in this issue (see page 20). The study provides interesting insights into the prevention of musculoskeletal (knee) disorders and the strategy to implement interventions in a specific trade—that is, floor and carpet fitters (floor layers)—in daily practice. The authors demonstrate that implementation of new working methods requires a …