Το ερωτηματολόγιο KOOS είναι ένα ερωτηματολόγιο αξιολόγησης λειτουργικότητας γόνατος. Αξιολογεί πόνο λειτουργικότητα σε καθημερινές δραστηριότητες, ποιότητα ζωης, ικανότητα συμμετοχής σε σπορ. Χρησιμοποιείται σε ασθενείς μετά από τραυματισμό γόνατος, σε οστεοαρθρίτιδα γόνατος ή έπειτα από χειρουργείο. Στην παρούσα διασκευή χρησιμοποιήθηκαν ασθενείς μετά από αρθροπλαστική γόνατος.

Αποτελέσματα Ελληνικής Έκδοσης: Internal consistency: Internal consistency was excellent with Cronbach’s a being 0.801 preoperatively, and 0.920 at discharge and at 2 weeks after TKR. Chronbach’s a for the 5 subscales of KOOS was found 0.785 preoperatively, 0.822 at discharge and 0.781 at 2 weeks. Test –retest reliability: ICCagreement (A-1) was used. KOOS’s score on reliability was very good (ICC= 0,746, 95% CI=-0.07-0.910) measured between the 2 post-operative occasions. KOOS’s reliability for the 5 subscales of the questionnaire post-operatively was also very good (ICC= 0.707, 95% CI=0.489-0.834). Measurement error: The SEM was found 5.027. Criterion-related Validity: A strong correlation was observed between KOOS score preoperatively and KOS-ADL (r=0.766), and moderate with SF-12 (Pearson’s r being 0.535 for the physical and 0.419 for the mental subscale). Post-operatively at discharge, correlations with KOS-ADL were weaker with r= 0.43. Correlations with SF-12 physical was weak (r= 0.372) and there was no correlation with SF-mental (r=0.044). Similar correlations were found at 2 weeks postoperatively, with r= 0.43 for KOS-ADL and r=0.333 for SF-physical and no correlation with SF-mental (r=0.023). Construct validity: Preoperatively weak correlations were found between KOOS pain subscale and SF-12 physical (r=0.34), SF-mental (r=0.23), and KOS-ADL (r=0.439). Moderate correlations were found between KOOS Function, daily living subscale and SF-12 physical r=.0509, and strong correlations were found between KOOS Function, daily living and Quality of life subscales with KOS-ADL (r being 0.778 and 0.771, respectively). At discharge, fair correlations were observed between KOOS quality of life subscale and KOS-ADL (r=0.414), and KOOS symptoms subscale and KOS-ADL (r=0.473). Fair correlations were also found at 2 weeks after TKR between KOOS quality of life subscale and KOS-ADL (r=0.442) and KOOS Function, daily living and KOS-ADL (r=0.455). Responsiveness: Effect size after TKR was considered medium (0.468). The SRM was found as 0,407 and the SDC (%) was 6,214 at individual level, where 10 has been considered as a clinically meaningful minimal improvement in KOOS score between measurements (Roos, 2003). No Floor and ceiling effects were observed.

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