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Journal of Bone and Joint Surgery - British Volume, Vol 89-B, Issue 1, 50-56.
doi: 10.1302/0301-620X.89B1.17790  
Copyright © 2007 by British Editorial Society of Bone and Joint Surgery
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Validation of the short-form WOMAC function scale for the evaluation of osteoarthritis of the knee

K. G. Auw Yang, MD, Orthopaedic Resident, PhD Student1; N. J. H. Raijmakers, MSc, Orthopaedic Clinical Data Manager1; A. J. Verbout, MD, PhD, Orthopaedic Surgeon, Professor1; W. J. A. Dhert, MD, PhD, FBSE, Head of Orthopaedic Research1; and D. B. F. Saris, MD, PhD, Orthopaedic Surgeon1

1 Department of Orthopaedics University Medical Center Utrecht, P. O. Box 85500, 3508 GA Utrecht, The Netherlands.

Correspondence should be sent to Dr D. B. F. Saris; e-mail: d.saris{at}umcutrecht.nl

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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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General