Assessment of the structural validity of three foot and ankle specific patient-reported outcome measures

•The LEFS, the VAS-FA, and the WOMAC have relatively similar psychometric properties.•The LEFS had the least suitable properties of coverage and targeting for assessment of foot and ankle surgery.•The VAS-FA instrument seems to have the most suitable measurement properties in this patient sample. Th...

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Bibliographic Details
Published in:Foot and ankle surgery 2020-02, Vol.26 (2), p.169-174
Main Authors: Ponkilainen, Ville T., Tukiainen, Erkki J., Uimonen, Mikko M., Häkkinen, Arja H., Repo, Jussi P.
Format: Article
Language:English
Subjects:
LEFS
Measures
Outcome
PROM
Validity
VAS-FA
WOMAC
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Summary:•The LEFS, the VAS-FA, and the WOMAC have relatively similar psychometric properties.•The LEFS had the least suitable properties of coverage and targeting for assessment of foot and ankle surgery.•The VAS-FA instrument seems to have the most suitable measurement properties in this patient sample. The structural validity of the Lower extremity functional scale (LEFS), the Visual analogue scale foot and ankle (VAS-FA), and the Western Ontario and McMaster Universities osteoarthritis index (WOMAC) has not been compared earlier in patients after foot and ankle surgery. Altogether 165 previously operated patients completed the foot and ankle specific instruments, the 15D health-related quality of life (HRQoL) instrument, and general health (VAS). The LEFS, the VAS-FA and the WOMAC had slight differences in their measurement properties. The VAS-FA had the best targeting and coverage. All three foot and ankle measures accounted for mobility and usual activities when compared to the different aspects of generic HRQoL. The LEFS, the VAS-FA and the WOMAC have relatively similar psychometric properties among foot and ankle patients, yet the VAS-FA provides the best targeting and coverage.
ISSN:1268-7731
1460-9584
DOI:10.1016/j.fas.2019.01.009