WOMAC Osteoarthritis Index

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WOMAC® 3.1 Index
Knee and Hip Osteoarthritis Index

Since its development in 1982, the WOMAC® Index has undergone several revisions and modifications. The Index is self-administered and assesses the three dimensions of pain, disability and joint stiffness in knee and hip osteoarthritis using a battery of 24 questions. The latest version of the instrument (WOMAC® 3.1) is available in over 90 alternate language forms, and in many languages is available in 5-point Likert, 100mm Visual Analogue and 11-box Numerical Rating Scale formats. The WOMAC® 3.1 has been linguistically validated and is widely used in the evaluation of knee and hip osteoarthritis. It is a valid, reliable and responsive measure of outcome, and has been used in diverse clinical and interventional environments. The index has been subject to numerous validation studies which have addressed the following specific clinimetric issues:

  • Reliability - stability, internal consistency
  • Validity - face, content, construct
  • Responsiveness - pharmacologic agents, devices, orthopaedic surgery, physical forms of therapy
  • Likert vs visual analogue scaling
  • Prior score availability
  • Time-frame dependency
  • Signal vs aggregate measurement
  • Parametric vs non-parametric analysis
  • Relative efficiency
  • Weighting and aggregation
  • Alternative forms of administration - telephone, mouse-driven cursor, touch screen, mobile phone
  • Benchmarking against responder criteria, state-attainment criteria and age- and gender-specific population-based normative values.

Use of the WOMAC® 3.1 Index is supported by the latest version of the User Guide - User Guide X. The User Guide contains information on index derivation, specific clinimetric issues, formatting, index presentation, score calculation, statistical issues and provides over 800 relevant references, the majority to previous studies employing the WOMAC® Osteoarthritis Index.

Consulting services are available from Professor Bellamy, to support use of the WOMAC® Index. These services include advice regarding clinical trial design, selection of WOMAC® Index measurement versions and scaling formats, parameters for sample size estimation based on the WOMAC® Index, and WOMAC® data interpretation with respect to the clinical importance of both the response achieved and the health state attained. 

WOMAC® User Guide

Click here to review the WOMAC® User Guide's Table of Contents.

WOMAC® 3.1 Alternate Language Forms

North America Canada
- English
- French
USA
- English
- Spanish
- Florida
Central America Costa Rica
Guatemala
Mexico
Puerto Rico

South America Argentina
Brazil
- Japanese
- Portugese
Chile
Columbia
Ecuador
Peru
- Japanese
- Spanish
Venezuela
Middle East Egypt
Israel
Jordan
Lebanon
Saudi Arabia
United Arab Emirates
- Arabic
- English

Asia-Pacific Australia
China
- Mandarin
Hong Kong
- Cantonese
India
- Bengali
- Gujarati
- Hindi
- Kannada
- Malayalam
- Marathi
- Punjabi
- Tamil
- Telugu
- Urdu
Japan
Korea
Malaysia
- Cantonese
- English
- Malay
- Tamil
New Zealand
Philippines
- Cebuano
- English
- Tagalog
Singapore
- Mandarin
- English
Taiwan
- Mandarin
Thailand
Europe Austria
Belgium
- French
- Flemish
Bulgaria
Croatia
Czech Republic
Denmark
Estonia
Finland
France
Germany
Greece
Hungary
Iceland
Ireland
Italy
Latvia
- Latvian
- Russian
Lithuania
Netherlands
Norway
Poland
Portugal
Romania
Serbia
Slovakia
Slovenia
Spain
Sweden
Switzerland
- German
- French
- Italian
Turkey
United Kingdom
 
Other Russia
South Africa
- Afrikaans
- English
Ukraine
- Ukranian
- Russian

WOMAC® is a registered trade-mark
(CDN No. TMA 545,986), (EU No. 004885235), (USA No. 3520667)

Page last updated: May 2012




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