We read the article by Harding and colleagues [2] with great interest. Harding and colleagues examined the level of physical activity before and after total knee or hip arthroplasty in patients with osteoarthritis. We recognize the considerable efforts made by the authors of this study, including recruiting a large number of patients, and measuring physical activity before and 6 months after surgery using accelerometry. We are completely in line with the authors' view that physical activity after arthroplasty is crucial for reducing further risks of inactivity-related morbidity, and that surgery alone does not result in pronounced physical activity. There is growing evidence [3, 5, 6] that further efforts are needed as different research groups did not find a satisfactory increase of physical activity after arthroplasty.
展开▼
