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Cross-cultural adaptation and validation of the Portuguese version of the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS)

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Abstract

The objective of this study was to cross-culturally adapt and validate the Portuguese version of the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS). This version was obtained with forward/backward translations, consensus panels and pre-testing. The Portuguese KOS-ADLS and Medical Outcomes Study, 36-item Short Form (SF-36) questionnaires, visual analogue scales (VAS) of pain, disability and discomfort, and a form for patient’s characteristics were administered to 168 subjects with knee osteoarthritis (OA). Reliability was acceptable (Cronbach’s alpha = 0.91; ICC = 0.97). There were significant correlations with SF-36 physical component subscales, all VAS, and duration of knee OA. The subjects with bilateral knee OA and that need walking aids obtained lower scores (p < 0.001). No floor/ceiling effects were detected. Responsiveness to physical therapy was showed (standardized effect size = 0.62; standardized response mean = 1.02). The Portuguese KOS-ADLS evidenced acceptable reliability, validity, floor/ceiling effects, and responsiveness.

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Acknowledgements

The authors would like to thank Dr. Nancy Hamilton (University of Northern Iowa, USA) for the English editing of the manuscript.

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Authors and Affiliations

  1. Faculty of Human Kinetics, Center for Research in Physiotherapy, Technical University of Lisbon, Lisbon, Portugal

    Rui Soles Gonçalves & Jan Cabri

  2. Superior School of Health Technology of Coimbra, Polytechnic Institute of Coimbra, Rua 5 de Outubro, S. Martinho do Bispo, Apartado 7006, 3040-162, Coimbra, Portugal

    Rui Soles Gonçalves

  3. Faculty of Medicine, University of Coimbra, Coimbra, Portugal

    João Páscoa Pinheiro

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  1. Rui Soles Gonçalves
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  2. Jan Cabri
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  3. João Páscoa Pinheiro
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Correspondence to Rui Soles Gonçalves.

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Soles Gonçalves, R., Cabri, J. & Páscoa Pinheiro, J. Cross-cultural adaptation and validation of the Portuguese version of the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS). Clin Rheumatol 27, 1445–1449 (2008). https://doi.org/10.1007/s10067-008-0996-8

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