Birch S, et al. - In this prospective observational cohort study, researchers explored the connection between preoperative pain catastrophizing and physical function one year after surgery, as well as differences in physical function, pain and general health in two groups of patients with high and low preoperative pain catastrophizing score. Between March 2011 and December 2013, 615 patients [mean age was 67.3 (SD: 9.7)] scheduled for knee arthroplasty (KA) were included. Compared with patients without elevated pain catastrophizing, those with high levels of preoperative pain catastrophizing have a lower physical function, more pain and poorer general health both before and after KA.