title: The International Knee Documentation Committee (IKDC) Subjective Short Form: a validity and reliability study.
abstract: OBJECTIVE
  The purpose of the present research was to translate the original English version of International Knee Documentation Committee (IKDC) Subjective Short Form to Persian and to assess validity and reliability of it in Iranian patients with ACL injury.
  
  
  METHODS
  The Persian version of the IKDC Subjective Short Form was administered to 145 patients including 111 men (76 %) and 34 women (24 %) with the clinical diagnosis of knee ACL tear that were referred to our Knee and Shoulder Center at Mashhad University of Medical Sciences, Mashhad, Iran. The Persian IKDC Subjective Short Form and Persian SF-36 questionnaire were completed by patients in the clinic before beginning any treatment intervention. Patients filled out the Persian IKDC 72 h again before receiving a major treatment; we were then able to use the test-retest method to calculate reliability.
  
  
  RESULTS
  The average age of the subjects was 30.9 ± 10.4 years. The calculated ICC with 95 % confidence interval was 0.845. In this study, Cronbach's alpha was 0.845. There were significant correlations between mean total score of the Persian IKDC and all items of the SF36 (P < 0.05) except for MCS (P = 0.055).
  
  
  CONCLUSIONS
  Cronbach's alpha and correlation of IKDC Subjective Short Form and SF-36 demonstrated that the Persian version of IKDC has both strong reliability and validity. The Iranian version of IKDC has favourable validity and reliability and therefore can be used to assess Persian-speaking patients with cruciate ligament injuries.
  
  
  METHODS
  Level II.
authors: Orthopaedic and Trauma Research Center, Ghaem Hospital Medical School, Mashhad University of Medical Sciences, 99199-91766, Mashhad, Iran.
authors: Mohammad Hosein
authors: MH
authors: Ebrahimzadeh
authors: Orthopaedic and Trauma Research Center, Ghaem Hospital Medical School, Mashhad University of Medical Sciences, 99199-91766, Mashhad, Iran. makhmalbafh@mums.ac.ir.
authors: Hadi
authors: H
authors: Makhmalbaf
authors: Orthopaedic and Trauma Research Center, Ghaem Hospital Medical School, Mashhad University of Medical Sciences, 99199-91766, Mashhad, Iran.
authors: Farideh
authors: F
authors: Golhasani-Keshtan
authors: School of Behavior and Brain Science, The University of Texas, 800 West Campbell Road, Richardson, TX, 75080-3021, USA.
authors: Shadi
authors: S
authors: Rabani
authors: Orthopaedic and Trauma Research Center, Kamyab Hospital Medical School, Mashhad University of Medical Sciences, 99199-91766, Mashhad, Iran.
authors: Ali
authors: A
authors: Birjandinejad
mesh_terms: D000328:Adult; D000070598:Anterior Cruciate Ligament Injuries; D065246:Culturally Competent Care; D005260:Female; D006801:Humans; D007492:Iran; D007718:Knee Injuries / Q000175:diagnosis*; D008297:Male; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D014175:Translating; D055815:Young Adult
keywords: ACL; IKDC; Iran; Persian; Persian Version; Reliability; Validity