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ENGLISH SUMMARY
Reliability, validity and responsiveness of the lcelandic version of the knee
injury and osteoarthritis outcome score (KOOS)
Briem K
Purpose: The KOOS self-report questionnaire (Knee injury and Osteo-
arthritis Outcome Score) has 5 sub-scales, assessing knee symptoms
and function, and quality of life. It is widely used as it has been found
to be a valid and reliable measure. The purpose of this study was to
investigate the validity, reliability and responsiveness of the lcelandic
translation of KOOS.
Methods: A total of 145 were recruited for the study and in addition
to answering KOOS, knee pain was rated on a visual analog scale
(VAS), perception of knee function during activities of daily living on a
numerical rating scale, and some were tested with the timed up-and-go
test (TUG). Reliability was assessed by observing ICC-values, internal
consistency with Cronbach's alpha, and associations between KOOS
subscales and other outcome measures with Pearson's correlation
coefficient. A one-way ANOVA was used to assess differences between
groups of participants with different levels of knee dysfunction.
Results: A significant change in all KOOS subscales was found in
a group of individuals seeking treatment for their knee dysfunction
(p<0.001), while no change was seen in a group reporting stable knee
status (ICC-values ranging from 0.825 to 0.930). Cronbach's alpha rang-
ed from 0.726 to 0.966 and significant correlations were found between
all KOOS sub-scales and other outcome measures (p<0.001).
Conclusion: The results indicate that the lcelandic version of KOOS is
a valid and reliable measure that may be used as an outcome measure
assessing knee symptoms and function of individuals with knee symp-
toms and impaired knee function.
Key words; Knee, Questionnaire, Function, Symptoms, Self-report, KOOS.
Correspondence: Kristin Briem, kbriem@hi.is
Department of Physical Therapy, Faculty of Medicine, School of Health Sciences, University of lceland, Reykjavik, lceland.
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