Citation

Almangoush A, Herrington L, Attia I, Jones R, Aldawoudy A, Abdul Aziz A, Waley A. Osteoarthritis Cartilage 2013; 21(12): 1855-1864.

Affiliation

College of Health, Sport and Rehabilitation Sciences, University of Salford, Salford M6 6PU, United Kingdom.

Copyright

(Copyright © 2013, Osteoarthritis Research Society International, Publisher Elsevier Publishing)

DOI

10.1016/j.joca.2013.09.010

PMID

24095836

Abstract

OBJECTIVE: The objective of this study was to cross-culturally adapt and validate the Arabic version of the Knee injury and Osteoarthritis Outcome Score (KOOS) among a sample from Egyptian populace.

METHODS: This version was obtained with forward/backward translations, and pre-testing. The Arabic KOOS, the RAND 36-Item Health Survey (RAND-36) questionnaire, visual analogue scales (VAS) of pain and a form for patient characteristics were used. Test-retest reliability and internal consistency were assessed, using Intraclass Correlation Coefficient (ICC) and Cronbach's alpha, respectively. The dimensionality was assessed, by factor analysis and construct validity by using a priori hypothesized correlations with the RAND-36. Ceiling/floor effects and measurement error were tested as well.

RESULTS: No major difficulties were encountered during the translation and pre-testing stages. Reliability was acceptable with Cronbach's alpha coefficients between 0.80 and 0.95, and intraclass correlation coefficients (ICC) ranging from 0.88 to 0.96 for the KOOS subscales. Factor analysis was performed on the whole study population and the results indicated that all items of the Arabic KOOS loaded on one factor, which ranged from 0.34 - 0.89. Construct validity was supported by the confirmation of all priori hypotheses by the presence of higher correlations between similar constructs than between dissimilar constructs of the KOOS subscales, RAND-36 subscales and VAS. Floor/ceiling effects were considered not to be present.

CONCLUSION: The Arabic KOOS is a reliable and valid instrument that can be self-administered to Egyptian patients and provides a valuable basis for research and clinical projects focusing on patient-based assessments in ACL, meniscus and combined injures of knee. Further studies to validate the Arabic version of the KOOS using females and elderly population with different knee problems and various educational levels in other Arabic counties is highly recommended.

Language: en