DOS 2019

178 · DOS Abstracts Translation and cross-cultural adaptation of the Oxford Knee Score – Activity and Participation Questionnaire (OKS-APQ) into Danish Lina Holm Ingelsrud, Kirill Gromov, Anders Troelsen Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre Background: The Oxford Knee Score – Activity and Participation Questionnaire (OKS- APQ) was developed in 2014 as a supplement to the OKS, intended to measure higher levels of activity and participation of patients undergoing total knee replacement (TKR). Purpose / Aim of Study: The purpose of this study was to translate and cross- culturally adapt the 8-item OKS-APQ into Danish. Materials and Methods: Translation to Danish was performed according to international translation guidelines. The translation procedure included two for- ward- and two backwards translations by independent translators, followed by a consensus meeting. To ensure high face- and content validity, the translated version was pre-tested on seven patients attending orthopedic consultations either on the waiting list for a TKR or for a 3-months or 1-year postoperative control after TKR. Psychometric evaluations included Rasch analysis, Differential Item Functioning (DIF) and internal consistency evaluations. Analyses were per- formed on randomly extracted 1-year postoperative data from one hospitals’ arthroplasty database, from 400 patients (mean age 69.3, 61.5% female) un- dergoing primary TKR between August 2016 and February 2018. Findings / Results: The Danish OKS-APQwas found to be relevant and compre- hensive by patients in the pre-test, however some difficulty in interpreting the response options, resulting in reversing the response scale, was reported. Floor and ceiling effects were observed for 5% and 10%, respectively. A predefined hypothesis of convergent validity with the OKS was confirmed (Spearman cor- relation 0.76). Internal consistency was found high (Chronbachs alpha 0.95). Good fit to the Rasch model was observed when evaluating individual item fit statistics and no local dependence was found (Yen’s Q3 0.05). There was evi- dence of DIF for gender in two items and for age (>= 60 vs. < 60 years) for one item, however the impact on the total score was considered small. Conclusions: The Danish OKS-APQ show promising psychometric properties at 1 year after a TKR and can be used in conjunction with the 12-item OKS. Future psychometric analyses are needed to evaluate reliability and responsive- ness of the OKS-APQ. 134.