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Translation and validation of ‘The Knee Society Clinical Rating System’ into Spanish

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The Knee Society Clinical Rating System (KSS) is a questionnaire evaluating knee function itself and the patient’s ability to walk and climb stairs. The aim of our study is to present the validated translation of KSS into Spanish.

Methods

The validated method of translation–retrotranslation was used to translate KSS into Spanish. Three hundred and sixteen patients undergoing primary knee arthroplasty, before surgery and 6 months postoperative, completed the questionnaire (with an orthopedist’s help). Psychometric properties of feasibility (percentage of no answers), validity and sensitivity to change (test’s ability to detect change in patients’ functional status over time) were assessed. In the second part of the study, the translated version of KSS was compared with two already validated questionnaires (SF-36 and WOMAC).

Results

During the translation process, item 3 (ROM) presented low appropriateness and null comprehensibility. The alternative writing proposed was ‘for every 5°, we sum up 1 point, as if 8° were 1 point, to obtain the maximum scoring of 25 points you should bend more than 200°’. Feasibility: the item ‘malalignment’ obtained 15 % of missing item at visit 1. The percentage of invalid items was high in both visits (60 and 47 %). Validity: the coefficients of convergent correlation with WOMAC and SF-36 scales confirm the questionnaire’s validity. Sensitivity to change: significant differences were found in all cases between the mean scores comparing both visits.

Conclusion

The translated version 1.1 of KSS (final version) has shown to be feasible, valid and sensible to changes within the clinical practice of patients undergoing primary knees arthroplasty.

Level of evidence

Prognostic study, Level I.

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Acknowledgments

We thank Sociedad Española de Rodilla (SEROD; Spanish Knee Association) for their contribution to the completion of the manuscript.

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Authors and Affiliations

  1. Orthopedic Department, Hospital Clinic Barcelona, University of Barcelona, Villarroel st. 170, 08036, Barcelona, Spain

    Oscar Ares & Francisco Maculé

  2. Hospital Vall d’Hebron, Barcelona, Spain

    Enric Castellet

  3. Hospital de Cieza, Murcia, Spain

    Vicenç León

  4. Hospital Universitario Virgen de la Victoria, Malaga, Spain

    Elvira Montañez

  5. Complexo Hospitalario Universitario A Coruña, A Coruña, Spain

    Alicia Freire

  6. Parc de Salut Mar. Hospital de La Esperanza, Barcelona, Spain

    Pedro Hinarejos & Ferran Montserrat

  7. Hospital de Viladecans, Barcelona, Spain

    Juan Ramon Amillo

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  1. Oscar Ares
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  2. Enric Castellet
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  3. Francisco Maculé
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Corresponding author

Correspondence to Oscar Ares.

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Ares, O., Castellet, E., Maculé, F. et al. Translation and validation of ‘The Knee Society Clinical Rating System’ into Spanish. Knee Surg Sports Traumatol Arthrosc 21, 2618–2624 (2013). https://doi.org/10.1007/s00167-013-2412-4

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  • DOI: https://doi.org/10.1007/s00167-013-2412-4

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