Cross-cultural adaptation and validation of the Romanian Knee disability and Osteoarthritis Outcome Score for Joint Replacement (KOOSJR)

Abstract

Aim: To perform validation of the Romanian Knee disability and Osteoarthritis Outcome Score for Joint Replacement (KOOSJR). Method: 96 patients (101 knees) with advanced osteoarthritis (OA) scheduled for total knee replacement completed Romanian translations of KOOSJR and IKDC (International Knee Documentation Committee – subjective knee form) and Euroqol EQ-5D-5L, and the treating physician completed the original knee society score (KSS). Results: Average age was 66.4 (range 50-83) years and male to female ratio 1:3.76. There was moderate correlation between the test-retest (average 4 days) KOOSJR (r=0.618, n=45) and IKDC (r=-0.671, n=99), weak between KOOSJR and EQ-5D-5L Index (r=-0.431, n=100) and VAS (r=-0.364, n=99) and very weak to KSS score (r=-0.133, n=98) and function (r=-0.072, n=97) For the first KOOSJR, Cronbach's alpha was 0.816 and intraclass correlation coefficient (ICC) 0.816 (95% CI 0.755-0.866) for average measures. For the retest, Cronbach's alpha was 0.841 (95% CI 0.760-0.903) for averages. Conclusion: The Romanian Knee disability and Osteoarthritis Outcome Score for Joint Replacement (KOOSJR) is a valid, reliable, consistent and reproducible clinical score for patients with OA requiring arthroplasty.