Theoretical model and Rasch analysis to develop a revised Foot Function Index.
BACKGROUND
The Foot Function Index (FFI) is a widely used self-reported measure of health-related foot function. Several areas have been identified for potential improvement, and this study responds to such criticisms. The objectives of this study were to: (1) develop a theoretical model of foot functioning, (2) develop a revised FFI (FFI-R), and (3) field-test the FFI-R.


METHODS
A literature review was conducted to develop the theoretical model. The FFI-R items were developed from the original 23 FFI items, and more items were added as a result of the literature review. A focus group discussion with clinicians and pilot interviews with patients resulted in a final draft of the FFI-R. This draft consisted of four subscales and comprised 68 items with a six-point response scale. The FFI-R was field tested on 92 patients in the podiatry clinic of a Veterans Administration Hospital in the Midwest. Psychometric analyses were conducted with modern item response theory (IRT) methods.


RESULTS
A theoretical model of foot functioning was developed. The FFI-R response scale was revised from six to five categories since confusion was found between categories 4 and 5. Rasch analyses indicated a person reliability of 0.96 and item reliability of 0.93. The subscale reliability of pain and stiffness, psychosocial, and disability were all >0.80; the exception was assistive devices (>0.50). Construct validity of FFI-R was supported based on the correlation of 50-ft walk time with an FFI-R total of 0.306, p = 0.018, N = 59. Rasch analyses indicated several items with poor fit statistics and a short form with 34 items was developed.


CONCLUSIONS
The FFI was revised, and new items were added to compose the FFI-R. The chief theoretical change was adding a psychosocial scale. Both long and short forms had very good psychometric properties.
Budiman-Mak
Elly
E
VA Hines Hospital HSR & D and Loyola University Stritch School of Medicine, 5th Ave and Roosevelt Rd, Hines, IL 60141, USA. elly.mak@va.gov
Conrad
Kendon
K
Stuck
Rodney
R
Matters
Michael
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004185:Disability Evaluation; D005260:Female; D005534:Foot Diseases / Q000503:physiopathology* / Q000523:psychology; D006787:Hospitals, Veterans; D006801:Humans; D008297:Male; D008875:Middle Aged; D015146:Midwestern United States; D008962:Models, Theoretical; D010146:Pain / Q000503:physiopathology / Q000523:psychology; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*