Validity, reliability, and Rasch analysis of the orthotics and prosthetics users' survey: Turkish version of the lower-extremity functional status

Soyer K., Demirdel S., EROL ÇELİK S., TOPUZ S., KARAHAN S.

Prosthetics and Orthotics International, vol.47, no.3, pp.307-312, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 3
  • Publication Date: 2023
  • Doi Number: 10.1097/pxr.0000000000000198
  • Journal Name: Prosthetics and Orthotics International
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, CINAHL, EMBASE, MEDLINE
  • Page Numbers: pp.307-312
  • Keywords: function, lower-extremity, quality of life, questionnaire
  • Hacettepe University Affiliated: Yes


Background:It is well known that questionnaires and scales are easy to use, cheap, and provide fast results. In the clinical setting, it will be easier and more comfortable to evaluate lower-extremity functions in both prosthesis and orthosis users with a single questionnaire.Objectives:To study the Turkish version of the orthotics and prosthetics users' survey lower-extremity functional status (OPUS-LEFS) and investigate its reliability and validity in the Turkish prosthesis and orthosis users.Study design:After forward and backward translation process, test-retest, internal consistency, validity, dimensionality, and Rasch analysis were done for 139 participants.Methods:Participants with a lower-limb prosthesis or orthosis were recruited in this study. Test and retest of the survey was done 1-3 days apart. For convergent validity, Nottingham Health Profile was used. Pearson correlation coefficient was used to analyze test-retest reliability; Cronbach's alpha for internal consistency, Spearman's correlation coefficient for validity, exploratory factor analysis by means of Kaiser-Meyer-Olkin and Bartlett's value of sphericity for dimensionality, and Rasch analysis were used.Results:Test-retest reliability of OPUS-LEFS showed very strong correlation (0.994) and for internal consistency with Cronbach's alpha value 0.71 of the Turkish version of OPUS-LEFS. Analyses showed that OPUS-LEFS is valid (p < 0.001) and significant (p < 0.001).Conclusions:The Turkish version of the OPUS-LEFS has been shown to be a valid and reliable tool in evaluating both orthosis and prosthesis users with a self-administered questionnaire for LEFS.