title: [Reliability, validity and responsiveness of the Icelandic version of the knee injury and osteoarthritis outcome score (KOOS)].
abstract: The KOOS self-report questionnaire (Knee injury and Osteoarthritis 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 Icelandic translation of KOOS.
  
  
  
  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.
  
  
  
  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 ranged from 0.726 to 0.966 and significant correlations were found between all KOOS sub-scales and other outcome measures (p<0.001).
  
  
  
  The results indicate that the Icelandic 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 symptoms and impaired knee function.
authors.affiliation: Námsbraut sjúkrabjáffun, Læknadeild Háskóla Islands. kbriem@hi.is
authors.forename: Kristin
authors.initials: K
authors.lastname: Briem
mesh_terms: D000203:Activities of Daily Living; D000704:Analysis of Variance; D004185:Disability Evaluation; D006801:Humans; D007055:Iceland; D007717:Knee / Q000503:physiopathology*; D007718:Knee Injuries / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology / Q000628:therapy; D007802:Language; D020370:Osteoarthritis, Knee / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology / Q000628:therapy; D010147:Pain Measurement; D011237:Predictive Value of Tests; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D016896:Treatment Outcome