Article

OBJECTIVE: To examine the convergent and factor validity of the Western Ontario
and McMaster Universities Osteoarthritis Index physical function subscale
(WOMAC-PF) using a battery of physical performance measures (PPMs) in patients
with non-end-stage hip osteoarthritis (OA).
DESIGN: Cross-sectional data.
SETTING: A university physiotherapy research center. PARTICIPANTS: Patients with
a clinical diagnosis of hip OA
(N=93) referred for participation in research.
INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Factor validity of the
WOMAC-PF was evaluated by using confirmatory factor analysis (CFA). Exploratory
factor analysis (EFA) was run to determine whether WOMAC-PF and PPMs were
capturing separate aspects of physical function. Covariates including pain,
depression, Pain Beliefs Screening Instrument, body mass index, hip flexion, use
of an assistive device, and lower-extremity strength were included in the EFA as
independent variables. RESULTS: CFA of the WOMAC-PF yielded a 1-factor solution
accounting for 84% of the variance in the data (eigenvalue=11). EFA yielded a
2-factor solution accounting for 68% of the variance in the data. The PPMs and
the WOMAC-PF loaded on separate factors. CONCLUSIONS: We were unable to confirm a
4-factor solution model of the WOMAC-PF as previously reported. This suggests
that the WOMAC-PF shows sufficient factor validity in capturing perceived
physical function in patients with non-end-stage hip OA but captures a different
construct than that of PPMs, confirming the need for both when evaluating
functional outcome. Furthermore, we suggest a new standardized battery of
physical performance measures to serve as the criterion standard against which
self-report measures could be compared.
CI - Copyright (c) 2010 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS