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. CONCLUSION: 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.
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. CONCLUSION: 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.
Authors: James S Wrobel; Adam E Fleischer; Jonathon Matzkin-Bridger; Jeanna Fascione; Ryan T Crews; Nicholas Bruning; Beth Jarrett Journal: PM R Date: 2015-09-25 Impact factor: 2.298
Authors: Jorge L Perez; Zachary A Mosher; Shawna L Watson; Evan D Sheppard; Eugene W Brabston; Gerald McGwin; Brent A Ponce Journal: Clin Orthop Relat Res Date: 2017-04-03 Impact factor: 4.176
Authors: I N Sierevelt; R Zwiers; W Schats; D Haverkamp; C B Terwee; P A Nolte; G M M J Kerkhoffs Journal: Knee Surg Sports Traumatol Arthrosc Date: 2017-10-12 Impact factor: 4.342
Authors: Alireza Mousavian; Ali Mohammadi; Seyed-Hadi Seyed-Hosseinian; Omid Shahpari; Nafiseh Elahpour; Arezoo Orooji; Mohammad H Ebrahimzadeh; Ali Moradi Journal: Arch Bone Jt Surg Date: 2019-05