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Health and Quality of Life Outcomes
Published in: Health and Quality of Life Outcomes 1/2017

Open Access 01-12-2017 | Research

Comparing the Chinese versions of two knee-specific questionnaires (IKDC and KOOS): reliability, validity, and responsiveness

Authors: Chien-Chih Huang, Wen-Shiang Chen, Mei-Wun Tsai, Wendy Tzyy-Jiuan Wang

Published in: Health and Quality of Life Outcomes | Issue 1/2017

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Abstract

Background

The International Knee Documentation Committee Subjective Knee Form (IKDC) and the Knee Injury and Osteoarthritis Outcome Score (KOOS) are knee-specific questionnaires that have been widely used and translated into numerous languages. However, the differences in the psychometric properties between the Chinese IKDC and KOOS remain unclear. The purpose of this study was to conduct a cross-cultural adaptation of the Chinese IKDC and Chinese KOOS and to compare the psychometric properties of these two measures in patients with various knee injuries from the acute stage up to 12 weeks after receiving treatment.

Methods

The original IKDC and KOOS were translated into Chinese based on the guidelines of cross-cultural adaptation and translation protocols. One hundred and seventy-three patients with various knee injuries were recruited in this study and completed both Chinese IKDC and Chinese KOOS as well as a generic health status questionnaire (Chinese Short Form-36 [SF-36]). The reliability, internal consistency, content validity, convergent and divergent validity and responsiveness of both IKDC and KOOS were assessed with appropriate indices.

Results

The Chinese IKDC showed excellent reliability (ICC = 0.97) and strong internal consistency (Cronbach alpha = 0.87). The Chinese KOOS also presented good reliability with ICCs ranging from 0.89 to 0.95 and internal consistency (Cronbach alpha coefficients ranging from 0.76 to 0.97). The content validity of these two questionnaires were excellent, yielding no floor or ceiling effects. Both the Chinese IKDC and KOOS were highly associated with the physical component summary (PCS) score and weakly related to the mental component summary (MCS) score of the SF-36. Responsiveness to change was large (effect size =0.95) for the Chinese IKDC and moderate (effect sizes = 0.49~0.60) at 12-week after physical therapy.

Conclusion

Both the Chinese IKDC and KOOS demonstrated good psychometric properties. However, the Chinese IKDC was more sensitive to changes over a period of 2, 4, 8, 12 weeks of physical therapy than the Chinese KOOS. The ROC analyses revealed a value of area under the curve (0.83 for the Chinese IKDC and 0.67–0.79 for the subscales of Chinese KOOS). Minimal clinically important difference values were 9.8 for the Chinese IKDC and 0.79, 0.76, 0.76, 0.76, 0.67 for the Symptoms, Pain, Activities of Daily Living, Sport/Recreation, and Quality of Life subscales of Chinese KOOS, respectively. The current study provides information for clinicians and researchers to use these appraisal tools for Chinese-speaking patients with various knee disorders.
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Metadata
Title
Comparing the Chinese versions of two knee-specific questionnaires (IKDC and KOOS): reliability, validity, and responsiveness
Authors
Chien-Chih Huang
Wen-Shiang Chen
Mei-Wun Tsai
Wendy Tzyy-Jiuan Wang
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Health and Quality of Life Outcomes / Issue 1/2017
Electronic ISSN: 1477-7525
DOI
https://doi.org/10.1186/s12955-017-0814-6

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