title: The international Hip Outcome Tool-33 (iHOT-33): multicenter validation and translation to Spanish.
abstract: BACKGROUND
  The international Hip Outcome Tool-33 (iHOT-33) is a 33-item self administered outcome measure based on a Visual Analogue Scale response format designed for young and active population with hip pathology. The aim of the present study is to translate and validate the iHOT-33 into Spanish.
  
  
  METHODS
  97 patients undergoing hip arthroscopy were included in this prospective and multicenter study performed between January 2012 and May 2014. Crosscultural adaptation was used to translate iHOT-33 into Spanish. Patients completed the questionnaire before and after surgery. Feasibility, reliability, internal consistency, construct validity (correlation with Western Ontario and McMaster Universities Osteoarthritis Index), ceiling and floor effects and sensitivity to change were assessed for the present study.
  
  
  RESULTS
  Mean age was 48 years old. Feasibility: 41.2 % patients had no blank questions, and 71.3 % of patients had fulfilled all but one or two questions. Reliability: ICC for the global questionnaire was 0.97, showing that the questionnaire is highly reproducible. Internal consistency: Cronbach's alpha was 0.98 for the global questionnaire. Construct validity: there was a high correlation with WOMAC (correlation coefficient >0.5). The Ceiling effect (taking into account the minimum detectable change) was 12.1 % and the floor effect was 21.6 %, for the global questionnaire. Large sensitivity to change was shown.
  
  
  CONCLUSIONS
  the Spanish version of iHOT-33 has shown to be feasible, reliable and sensible to changes for patients undergoing hip arthroscopy. This validated translation of iHOT-33 allows for comparisons between studies involving either Spanish- or English-speaking patients.
  
  
  METHODS
  Prognostic study, Level I.
authors.affiliation: Unidad de Hombro y Codo, Hospital Universitario Ramón y Cajal, Cta Colmenar Km 9.100, Madrid, 28046, Spain. drmri@hotmail.com.
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Ruiz-Ibán
authors.affiliation: Artroscopia GC - Fundación García Cugat - Hospital Quirón Barcelona, Barcelona, Spain. seijastraumatologia@gmail.com.|Anatomy Department, Universitat Internacional de Catalunya, Sant Cugat, Spain. seijastraumatologia@gmail.com.
authors.forename: Roberto
authors.initials: R
authors.lastname: Seijas
authors.affiliation: Hospital Vall d'Hebron, Barcelona, Spain. andreasallent@gmail.com.
authors.forename: Andrea
authors.initials: A
authors.lastname: Sallent
authors.affiliation: Artroscopia GC - Fundación García Cugat - Hospital Quirón Barcelona, Barcelona, Spain. arestraumatologia@gmail.com.|Anatomy Department, Universitat Internacional de Catalunya, Sant Cugat, Spain. arestraumatologia@gmail.com.
authors.forename: Oscar
authors.initials: O
authors.lastname: Ares
authors.affiliation: Hospital Universitario Infanta Leonor, Madrid, Spain. olivermarin@yahoo.es.
authors.forename: Oliver
authors.initials: O
authors.lastname: Marín-Peña
authors.affiliation: Unidad de Bioestadística Clínica, IRYCIS Instituto Ramón y Cajal de Investigación Sanitaria, Madrid, Spain. alfonso.muriel@hrc.es.|CIBERESP Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública, Madrid, Spain. alfonso.muriel@hrc.es.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Muriel
authors.affiliation: Hospital Universitario Donostia, San Sebastián, Spain. ricuellar@telefonica.net.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Cuéllar
mesh_terms: D000328:Adult; D005260:Female; D006621:Hip Joint; D006801:Humans; D007592:Joint Diseases / Q000150:complications / Q000503:physiopathology / Q000628:therapy*; D007802:Language; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D010147:Pain Measurement; D011446:Prospective Studies; D011788:Quality of Life; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires; D014177:Translations; D055815:Young Adult