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  • Title: Validation of the short-form WOMAC function scale for the evaluation of osteoarthritis of the knee.
    Author: Yang KG, Raijmakers NJ, Verbout AJ, Dhert WJ, Saris DB.
    Journal: J Bone Joint Surg Br; 2007 Jan; 89(1):50-6. PubMed ID: 17259416.
    Abstract:
    This study validates the short-form WOMAC function scale for assessment of conservative treatment of osteoarthritis of the knee. Data were collected before treatment and six and nine months later, from 100 patients with osteoarthritis of the knee to determine the validity, internal consistency, test-retest reliability, floor and ceiling effects, and responsiveness of the short-form WOMAC function scale. The scale showed high correlation with the traditional WOMAC and other measures. The internal consistency was good (Cronbach alpha: 0.88 to 0.95) and an excellent test-retest reliability was found (Lin's concordance correlation coefficient (rho(c)): 0.85 to 0.94). The responsiveness was adequate and comparable to that of the traditional WOMAC (standardised response mean 0.56 to 0.44 and effect size 0.64 to 0.57) and appeared not to be significantly affected by floor or ceiling effects (0% and 7%, respectively). The short-form WOMAC function scale is a valid, reliable and responsive alternative to the traditional WOMAC in the evaluation of patients with osteoarthritis of the knee managed conservatively. It is simple to use in daily practice and is therefore less of a burden for patients in clinical trials.
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