The relationship between experience of knee pain and physical activity participation: A scoping review of quantitative studies.

Objectives: Physical activity (PA) in people with knee pain can help to relieve pain and prevent health problems. However, engaging in regular PA is challenging for them due to chronic musculoskeletal pain. An understanding of how the experience of knee pain affects PA is important to minimize the negative effects of knee pain on participation in PA among this population. We examined the quantitative evidence describing the relationship between the experience of knee pain and participation in PA. Methods: We conducted a scoping review based on the PRISMA-ScR process across 27 items and Peters' methodological framework. Searches using keywords were performed in Medline, PsycINFO, CINAHL and Scopus. Results: Nine studies were included in this review. While one study clearly showed that increased knee pain increased PA, four studies indicated that knee pain decreased PA among individuals with knee pain. One study revealed that increased knee pain decreased moderate PA, but no significant difference with light intensity PA. Three studies showed that knee pain had no impact on PA. Moreover, psychological factors (catastrophizing and pain-related activity interference) and certain activities of daily living were risk factors for insufficient PA among people with knee pain. Conclusions: The limited quantitative evidence on the relationship between the experience of knee pain and PA participation highlights a gap in the knowledge base. The review findings found mixed results, with a negative, positive or no relationship between knee pain and levels of PA among individuals with knee pain. The findings also suggest that the relationship can be affected by psychological factors and different levels and types of PA. Therefore, practitioners should consider multi-component interventions which aim to increase PA levels of individuals with knee pain, after considering the above mediating factors.