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Construct Validity and Test Re-Test Reliability of the Forgotten Joint Score.
Simon M Thompson1, Lucy J Salmon1, Justin M Webb1
1North Sydney Orthopaedic and Sports Medicine Centre, The Mater Clinic, Suite 2, Wollstonecraft NSW, Australia.
The Journal of Arthroplasty
|June 2, 2015
Summary
The FJS questionnaire shows excellent reliability and validity for knee replacement patients. It may offer better discrimination than WOMAC or KOOS for assessing outcomes after total knee replacement (TKR).
Area of Science:
- Orthopedics
- Rehabilitation Medicine
- Biostatistics
Background:
- Knee arthroplasty outcomes require reliable and valid patient-reported measures.
- Existing instruments like WOMAC and KOOS may have limitations, including ceiling effects.
Purpose of the Study:
- To evaluate the test-retest reliability and construct validity of the FJS questionnaire.
- To compare the FJS with established measures (KOOS, WOMAC) in patients post-knee arthroplasty.
Main Methods:
- Consecutive knee arthroplasty patients completed FJS, KOOS, and WOMAC questionnaires.
- Test-retest reliability assessed via repeat questionnaires after 4-6 weeks.
- Convergent construct validity examined by correlating FJS scores with KOOS and WOMAC subscores.
Main Results:
- FJS demonstrated near-perfect test-retest reliability (ICC = 0.97) and high subdomain reliability (ICC > 0.8).
- Strong correlations were found between FJS and KOOS subscores (Quality of Life, Symptom, Pain, ADL) and total WOMAC score.
- FJS showed no ceiling effect, unlike WOMAC or KOOS pain scores, suggesting superior discriminatory ability.
Conclusions:
- The FJS exhibits high test-retest reliability and construct validity in knee arthroplasty patients.
- The FJS may be a more sensitive tool than WOMAC or KOOS for detecting changes in patient-reported outcomes after total knee replacement.
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