title: Cross-cultural adaptation and validation of the International Knee Documentation Committee Subjective Knee Form in Greek.
abstract: BACKGROUND
  Patient-reported outcomes require validation in a particular language and culture before administration for clinical use.
  
  
  METHODS
  A systematic translation of the IKDC Subjective Knee Form was initially tested in 30 patients with various knee pathologies to develop the first Greek version (IKDC/SKF-GR). It was then administered to another 80 patients. The test-retest reliability (n = 35) and internal consistency (n = 80) were examined. Construct validity was tested by correlating the IKDC/SKF-GR with the SF-36 subscales (n = 80) and content validity by measuring floor/ceiling effects. Responsiveness was measured in patients with meniscus pathology (n = 24).
  
  
  RESULTS
  Patients filled the form without omissions/questions regarding the phrasing of items. Internal consistency was good (Cronbach's α = 0.87) and test-retest reliability very good (ICC2,1 = 0.95, SEM = 4.4 and SDC = 12.2). Correlations with the SF-36 subscales confirmed its construct validity. No floor/ceiling effects were recorded. The effect size was large (ES = 1.26).
  
  
  CONCLUSIONS
  The IKDC/SKF-GR has comparable measurement properties to the original form.
  
  
  METHODS
  Level II.
authors.affiliation: Department of Physical Therapy, 401 Army General Hospital of Athens, 1 Panagioti Kanellopoulou Avenue, 11525, Athens, Greece. g.koumantakis2@gmail.com.
authors.forename: George A
authors.initials: GA
authors.lastname: Koumantakis
authors.affiliation: 2nd Department of Anesthesiology-Pain Unit, ATTIKON University General Hospital, School of Medicine, University of Athens, Athens, Greece.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Tsoligkas
authors.affiliation: Orthopaedic Surgeon, Rethymno, Greece.
authors.forename: Antonios
authors.initials: A
authors.lastname: Papoutsidakis
authors.affiliation: Department of Orthopaedic Surgery, University General Hospital of Alexandroupolis, School of Medicine, Democritus University of Thrace, Alexandroupolis, Greece.
authors.forename: Athanasios
authors.initials: A
authors.lastname: Ververidis
authors.affiliation: Department of Orthopaedic Surgery, University General Hospital of Alexandroupolis, School of Medicine, Democritus University of Thrace, Alexandroupolis, Greece.
authors.forename: Georgios I
authors.initials: GI
authors.lastname: Drosos
mesh_terms: D003466:Cultural Characteristics; D004185:Disability Evaluation; D006115:Greece; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology*; D000071066:Patient Reported Outcome Measures; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014177:Translations
keywords: Cross-cultural adaptation; Greek; International Knee Documentation Committee (IKDC); Knee; SF-36; Validation