Erratum 1

摘要

On May 24，2012，‘Habitual physical activity after total knee replacement: analysis in 830 patients and comparison with a sex-and age-matched normative population’ by Kersten RFMR, Stevens M, van Raay JJAM, et al was published online ahead of print in Physical Therapy. In the June 2012 issue of Journal of Physiotherapy, ^fter total knee arthroplasty, many people are not active enough to maintain their health and fitness: an observational study5 by Groen JW, Stevens M, Kersten RFMR, et al was published. These two related articles, both of which reported on the same sample of subjects, were written and published each without recognizing the other.