DOS 2020

DOS Kongressen 2020 · 99 Does preoperative pain catastrophizing influence objectively measured physical activity before and after total knee arthroplasty: a prospective cohort study Sara Birch, Torben Bæk Hansen, Maiken Stilling, Inger Mechlenburg Ergo og Fysioterapi afdelingen, Regionshospitalet Holstebro; Universitetsklinik for hånd-, hofte- og knækirurgi, Regionshospitalet Holstebro; Ortopædkirurgisk afdeling, Aarhus Universitetshospital Background: Pain catastrophizing is associated with pain both before and after a total knee arthroplasty (TKA). However, it remains uncertain whether pain catastrophizing affects physical activity (PA). Purpose / Aim of Study: The aim was to examine the influence of pain cata- strophizing on the objectively measured PA profile, knee function and muscle mass before and after a TKA. Materials and Methods: We included 58 patients with knee osteoarthritis scheduled for TKA. 29 patients had a score >22 on the pain catastrophizing scale (PCS) and 29 patients had a score <11. PA was measured with a tri-axial accelerometer preoperative, 3 and 12 months after TKA. Other outcome mea- sures consisted of the Knee Osteoarthritis outcome Score (KOOS) and Dual- energy X-ray absorptiometry (DXA) scans. Findings / Results: We found no difference in PA between patients with a high or a low score on the PCS and none of the groups increased their mean number of steps/day from preoperative to 12 months postoperative. Patients with low PCS scores had higher preoperative scores on the KOOS subscales: symptoms, pain and ADL and they walked longer in the 6MWT. Furthermore, they had lower BMI, lower percent fat mass, and higher percent muscle mass than patients in the high PCS group both before and after a TKA. Conclusions: Preoperative pain catastrophizing did not influence PA before or after a TKA. Although the patients improved substantially in self- reported knee function after TKA, their PA did not increase. A TKA alone is not enough to im- prove PA and this may be important to consider when the clinicians are inform- ing the patients about the expected benefits from the operation. 85.