title: Validity and reliability of the Dutch translation of the VISA-P questionnaire for patellar tendinopathy.
abstract: BACKGROUND
  The VISA-P questionnaire evaluates severity of symptoms, knee function and ability to play sports in athletes with patellar tendinopathy. This English-language self-administered brief patient outcome score was developed in Australia to monitor rehabilitation and to evaluate outcome of clinical studies. Aim of this study was to translate the questionnaire into Dutch and to study the reliability and validity of the Dutch version of the VISA-P.
  
  
  METHODS
  The questionnaire was translated into Dutch according to internationally recommended guidelines. Test-retest reliability was determined in 99 students with a time interval of 2.5 weeks. To determine discriminative validity of the Dutch VISA-P, 18 healthy students, 15 competitive volleyball players (at-risk population), 14 patients with patellar tendinopathy, 6 patients who had surgery for patellar tendinopathy, 17 patients with knee injuries other than patellar tendinopathy, and 9 patients with symptoms unrelated to their knees completed the Dutch VISA-P.
  
  
  RESULTS
  The Dutch VISA-P questionnaire showed satisfactory test-retest reliability (ICC=0.74). The mean (+/-SD) VISA-P scores were 95 (+/-9) for the healthy students, 89 (+/-11) for the volleyball players, 58 (+/-19) for patients with patellar tendinopathy, and 56 (+/-21) for athletes who had surgery for patellar tendinopathy. Patients with other knee injuries or symptoms unrelated to the knee scored 62 (+/-24) and 77 (+/-24).
  
  
  CONCLUSIONS
  The translated Dutch version of the VISA-P questionnaire is equivalent to its original version, has satisfactory test-retest reliability and is a valid score to evaluate symptoms, knee function and ability to play sports of Dutch athletes with patellar tendinopathy.
authors: Center for Sports Medicine, University Center for Sport, Exercise and Health, University Medical Center Groningen, University of Groningen, PO BOX 30,001, 9700 RB Groningen, the Netherlands. j.zwerver@sport.umcg.nl
authors: Johannes
authors: J
authors: Zwerver
authors: Tamara
authors: T
authors: Kramer
authors: Inge
authors: I
authors: van den Akker-Scheek
mesh_terms: D001315:Australia; D003431:Cross-Cultural Comparison; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000175:diagnosis* / Q000503:physiopathology; D007719:Knee Joint / Q000503:physiopathology* / Q000601:surgery; D007802:Language; D008297:Male; D009426:Netherlands; D017847:Patellar Ligament / Q000503:physiopathology* / Q000601:surgery; D011237:Predictive Value of Tests; D025341:Principal Component Analysis; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D052256:Tendinopathy / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery; D054798:Volleyball / Q000293:injuries*; D055815:Young Adult