Validity, reliability and responsiveness of the Turkish Version of the Munich Knee Questionnaire

Abstract

Purpose Self-reported surveys are an important part of a comprehensive assessment of clinical outcome. This cross-cultural adaptation study aimed to develop a Turkish version of the Munich Knee Questionnaire (MKQ-TR). Methods A total of 200 participants including 112 people with various knee injuries (53.9 ± 14.3 years, 68 males) and 88 healthy participants (30.0 ± 11.9 years, 74 males) were recruited. We analyzed criterion validity with Pearson’s correlation coefficients and test-retest reliability with intraclass correlations coefficient (ICC). Standard error of measurement (SEM) and minimal detectable change (MDC) were investigated for absolute reliability. Results There were strong correlations between MKQ-TR and International Knee Documentation Committee (r = − 0.96, p < 0.001) and Knee Injury and Osteoarthritis Outcome Score subscales (range for r = − 0.66 to − 0.96, all p < 0.001). Reliability was excellent (ICC > 0.90). The SEM results showed that absolute reliability ranged from good to doubtful (5.8–15.9 %), hence acceptable. The MKQ-TR had an MDC of 6.14 and 29.7 as the cut-off point. The area under the ROC curve showed excellent (0.991) accuracy with 0.973 sensitivity and 0.977 specificity. Conclusion MKQ-TR demonstrated excellent validity, reliability and accuracy to evaluate symptoms, pain, daily life activities, sports activities, physical function and quality of life in people with various knee injuries.