Despite the excellent benefits of knee replacement surgery for reducing pain and improving knee function, people are just as physically inactive after surgery as they were before. If it's not an issue of knee symptoms and function, then what's going on? Dr Daniel White, physical activity and osteoarthritis (OA) expert from the University of Delaware explains 3 common myths about physical activity with knee OA and shares up-to-date research to help you counter those myths when you're in the clinic. 2018 physical activity guidelines for Americans: https://health.gov/our-work/nutrition-physical-activity/physical-activity-guidelines/current-guidelines What's new in the 2018 physical activity guidelines: https://www.jospt.org/doi/10.2519/jospt.2019.0609