title: Reliability of the Dutch translation of the Kujala Patellofemoral Score Questionnaire.
abstract: OBJECTIVE
  There are no Dutch language disease-specific questionnaires for patients with patellofemoral pain syndrome available that could help Dutch physiotherapists to assess and monitor these symptoms and functional limitations. The aim of this study was to translate the original disease-specific Kujala Patellofemoral Score into Dutch and evaluate its reliability.
  
  
  METHODS
  The questionnaire was translated from English into Dutch in accordance with internationally recommended guidelines. Reliability was determined in 50 stable subjects with an interval of 1 week. The patient inclusion criteria were age between 14 and 60 years; knowledge of the Dutch language; and the presence of at least three of the following symptoms: pain while taking the stairs, pain when squatting, pain when running, pain when cycling, pain when sitting with knees flexed for a prolonged period, grinding of the patella and a positive clinical patella test. The internal consistency, test-retest reliability, measurement error and limits of agreement were calculated.
  
  
  RESULTS
  Internal consistency was 0.78 for the first assessment and 0.80 for the second assessment. The intraclass correlation coefficient (ICCagreement) between the first and second assessments was 0.98. The mean difference between the first and second measurements was 0.64, and standard deviation was 5.51. The standard error measurement was 3.9, and the smallest detectable change was 11. The Bland and Altman plot shows that the limits of agreement are -10.37 and 11.65.
  
  
  CONCLUSIONS
  The results of the present study indicated that the test-retest reliability translated Dutch version of the Kujala Patellofemoral Score questionnaire is equivalent of the test-retest original English language version and has good internal consistency. Trial registration NTR (TC = 3258). Copyright © 2015 John Wiley & Sons, Ltd.
authors: Faculty of Health, Department of Physiotherapy, Zuyd University of Applied Sciences, Heerlen, The Netherlands.|Paramedic Centre Sittard Zuid, Sittard, The Netherlands.|Avans Plus Improving Professionals, Breda, The Netherlands.
authors: P E J
authors: PE
authors: Ummels
authors: Faculty of Health, Department of Physiotherapy, Zuyd University of Applied Sciences, Heerlen, The Netherlands.|Maastricht University Medical Center, Maastricht, The Netherlands.
authors: A F
authors: AF
authors: Lenssen
authors: Avans Plus Improving Professionals, Breda, The Netherlands.
authors: M
authors: M
authors: Barendrecht
authors: Faculty of Health, Research Centre Autonomy and Participation of patients with a chronic illness, Zuyd University of Applied Sciences, Heerlen, The Netherlands.|Maastricht University, Caphri School, Maastricht, The Netherlands.
authors: A J H M
authors: AJ
authors: Beurskens
mesh_terms: D004185:Disability Evaluation; D006801:Humans; D009426:Netherlands; D010147:Pain Measurement; D057071:Patellofemoral Joint / Q000503:physiopathology*; D046788:Patellofemoral Pain Syndrome / Q000175:diagnosis* / Q000503:physiopathology; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*
keywords: Anterior Knee Pain Scale (AKPS); Kujala Patellofemoral Score; Patellofemoral pain syndrome (PFPS); questionnaire; test-retest reliability