title: Validation of the Dutch version of the Oxford Shoulder Score.
abstract: BACKGROUND
  The Oxford Shoulder Score (OSS) is an internationally-used patient-based outcome score. Up to now, it was not validated in Dutch. The purpose of this study was to produce a Dutch translation of the OSS and to test this version in terms of reliability and validity.
  
  
  METHODS
  Translation of the OSS was done according to the guidelines in literature. One hundred and three patients completed the Dutch version of the OSS. Additionally, the Constant-Murley shoulder score, the (Dutch) Simple Shoulder Test (DSST) score, and SF-36 were included into the validation process. Feasibility and patient-burden parameters were also tested.
  
  
  RESULTS
  One-hundred and three patients with general shoulder problems age 55 years (min-max: 21-81 +/- 13 yrs), sex ratio 2/3 (f/m) completed the Dutch version of the OSS and the SF-36. Internal consistency tested by the Cronbach's alpha (0.921) was high. Intra-class correlation coefficient was R = .981 (95% confidence interval: .961 - .993) and the mean difference between both tests was 2.7 points (0-8). Construct validity was also tested by the Pearson correlation coefficient and showed a significant correlation (P < .01) between the Dutch version of the OSS and the other scores (DSST 0.61; the Constant-Murley score 0.64 and with most of the SF-36 sub-scores, except for 2 psychometric subscales, namely, mental health (0.15 [P = .123]) and general health (0.10 [P = .316])
  
  
  CONCLUSIONS
  The instrument proved to be valid by demonstrating significant correlations predicted by standard clinical assessments (DSST and Constant-Murley scores) and a generic patient-based instrument (SF-36). Application and evaluation in clinical trial proved feasible and understandable.
authors.affiliation: Department of Orthopaedic surgery & Traumatology, Reinier de Graaf Hospital, Delft, the Netherlands. tdberendes@hotmail.com
authors.forename: Thomas
authors.initials: T
authors.lastname: Berendes
authors.forename: Peter
authors.initials: P
authors.lastname: Pilot
authors.forename: Jaap
authors.initials: J
authors.lastname: Willems
authors.forename: Hennie
authors.initials: H
authors.lastname: Verburg
authors.forename: Ron
authors.initials: R
authors.lastname: te Slaa
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003431:Cross-Cultural Comparison; D004185:Disability Evaluation; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D011446:Prospective Studies; D011594:Psychometrics; D015203:Reproducibility of Results; D012785:Shoulder Joint / Q000473:pathology*; D020069:Shoulder Pain / Q000145:classification / Q000175:diagnosis*; D011795:Surveys and Questionnaires; D055815:Young Adult