Objective: Knee injury and osteoarthritis outcome score (KOOS) is a useful scale in evaluating
symptoms and functional status related to knee injury and knee osteoarthritis. This tool has five
subscales, namely pain, symptoms, daily living, sports and recreational activities, and quality of
life related to the knee. The purpose of this study was to evaluate the reliability and validity of the
KOOS Turkish version in patients with knee osteoarthritis.
Material and Methods: Fifty patients with osteoarthritis were included in the study. All patients
completed the KOOS and SF- 36 health questionnaire. The procedure was repeated within a week
only for KOOS. Reliability, validity and internal consistency of the KOOS Turkish version were
evaluated.
Results: KOOS subscales interclass correlations were calculated to assess reliability. Reliability
coefficients were between 0.85- 0.89. Internal consistency was calculated using Cronbach’s
alpha. Cronbach’s alpha range was 0.66-0.95. All relationships above 0.26 were significant
(p< 0.05).
Conclusion: A positive correlation was observed between the KOOS subscales and also between
the similar subscales of SF-36 and KOOS. The results of our study suggest moderate reliability
and validity of the KOOS Turkish version.
Key Words: Osteoarthritis, knee; validation studies