title: Reliability and validity of the Tegner and Marx activity rating scales in Iranian patients with anterior cruciate ligament injury.
abstract: OBJECTIVE
  The aims of this study were to culturally translate and validate the Persian version of Tegner and Marx activity rating scales and to investigate their psychometric properties in a sample of patients (n = 100) with anterior cruciate ligament (ACL) injury.
  
  
  METHODS
  Four questionnaires were completed by the respondents: Tegner and Marx activity scales, Knee injury and Osteoarthritis Outcome Score (KOOS) and Short-Form 12 Health Survey (SF-12). The Tegner and Marx were re-administered to 45 patients in the retest session, with time interval of 2-6 days between the two sessions. Test-retest reliability and internal consistency were assessed using intra-class correlation coefficient (ICC) and Cronbach's alpha, respectively. To evaluate construct validity of Tegner and Marx compared to similar and dissimilar concepts of KOOS and SF-12, the Spearman's rank correlation was used.
  
  
  RESULTS
  Both Tegner and Marx activity scales have a high ICC level. The minimum Cronbach's alpha level of 0.70 was exceeded by Marx scale. In terms of construct validity, most of a priori hypotheses were confirmed.
  
  
  CONCLUSIONS
  The Persian version of Tegner and Marx seems to be suitable for Iranian patients with ACL injury. Future studies are needed to investigate the psychometric properties of these questionnaires for Iranian patients with different knee problems.
authors.affiliation: Musculoskeletal Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Negahban
authors.forename: Neda
authors.initials: N
authors.lastname: Mostafaee
authors.forename: Soheil Mansour
authors.initials: SM
authors.lastname: Sohani
authors.forename: Masood
authors.initials: M
authors.lastname: Mazaheri
authors.forename: Shahin
authors.initials: S
authors.lastname: Goharpey
authors.forename: Mahyar
authors.initials: M
authors.lastname: Salavati
authors.forename: Shahla
authors.initials: S
authors.lastname: Zahednejad
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Meshkati
authors.forename: Ali
authors.initials: A
authors.lastname: Montazeri
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D000070598:Anterior Cruciate Ligament Injuries; D044466:Asian People; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D007492:Iran; D007718:Knee Injuries / Q000503:physiopathology / Q000534:rehabilitation*; D007802:Language; D008297:Male; D009043:Motor Activity; D011594:Psychometrics / Q000379:methods* / Q000592:standards*; D011788:Quality of Life; D015203:Reproducibility of Results; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires / Q000592:standards; D055815:Young Adult