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Scientific Articles   |    
Responsiveness of the SF-36 and WOMAC Following Periacetabular Osteotomy for Acetabular Dysplasia
Darin Davidson, MD, MHSc, FRCSC1; Yi-Meng Yen, MD, PhD1; Alan M. Jette, PT, PhD2; Sippy Olarsch, PT, ScD2; Young-Jo Kim, MD, PhD1
1 The Adolescent and Young Adult Hip Unit, Department of Orthopaedic Surgery, Children's Hospital Boston, 300 Longwood Avenue, Boston, MA 02115. E-mail address for Y.-J. Kim: young-jo.kim@childrens.harvard.edu
2 Health and Disability Research Institute, Boston University School of Public Health, 580 Harrison Avenue, Boston, MA 02118
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Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

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Investigation performed at the Adolescent and Young Adult Hip Unit, Department of Orthopaedic Surgery, Children's Hospital Boston, Boston, Massachusetts

Copyright © 2011 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2011 Dec 07;93(23):2214-2218. doi: 10.2106/JBJS.J.00687
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Abstract

Background: 

Periacetabular osteotomy is a relatively common reconstructive procedure for the adolescent or young adult with acetabular dysplasia. Although several measures have been used to characterize the outcome, the responsiveness of these measures in this population has not been determined. The purpose of this study was to estimate the responsiveness of the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and the Short Form-36 (SF-36) in patients with acetabular dysplasia treated with periacetabular osteotomy.

Methods: 

Eighty-three patients with acetabular dysplasia treated with periacetabular osteotomy between 2000 and 2005 completed the WOMAC and SF-36 both preoperatively and postoperatively. The scores on each domain of these outcome measures were calculated and analyzed to determine the parameters of responsiveness, including the minimal detectable change at the 90% confidence level.

Results: 

The mean duration of follow-up was 1.9 years. Comparison of the effect size, standardized response mean, and minimal detectable change for the SF-36 and WOMAC demonstrated that the WOMAC was more sensitive to change than the SF-36 was, particularly in the physical function domain (minimal detectable change, 9.1) and the pain domain (minimal detectable change, 5.5). Only one of the eight domains of the SF-36, bodily pain, demonstrated a change in outcome that exceeded the minimal detectable change, which was 2.38.

Conclusions: 

Both the WOMAC and the SF-36 demonstrated adequate responsiveness to change over time in patients with acetabular dysplasia treated with periacetabular osteotomy, although the WOMAC was more sensitive to change. These results indicate that the WOMAC is sufficiently responsive to be used as a joint-specific measure for assessing changes following periacetabular osteotomy for the treatment of acetabular dysplasia.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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