Theoretical Model and Rasch Analysis to Develop a Revised Foot Function Index

Abstract

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.

Which Are the Most Frequently Used Outcome Instruments in Studies on Total Ankle Arthroplasty?

“…Second, the definitions of criterion validity and construct validity have been used rather confusingly in the different studies. Budiman-Mak et al [3,4], for example, defined the ''50 feet walking time test'' as a measure for criterion validity in their first paper on the FFI [4] but as a measure for construct validity in their last paper on the FFI [3]. The SF-36 and the WOMAC [2] also have been used to measure criterion validity [9], whereas the SF-36 was used to evaluate construct validity in another study [30].…”

Translation and cultural adaptation of the revised foot function index for the Portuguese language: FFI-R Brazil

“…18 The questionnaire was administered to a greater number of young, physically active women, which was similar to the method that had been used for the original questionnaire. 8 In the initial phase of translation into the Portuguese language, the term "five pounds" was replaced with 2 kg by the expert committee, since this is the measurement unit for mass that is used in Brazil, thereby allowing Table 2. Back translation phase.…”

“…The FFI-R has five domains containing 68 items, with questions relating to pain (11 items), stiffness (8 items), problems (20 items), activity limitation (10 items) and social issues (19 items). 8 Because of the importance of standardization when using evaluation measurements, questionnaires developed in foreign languages need to be translated and their psychometric properties evaluated, to create equivalence between studies. This process makes it possible for physicians and other professionals working in a given field to obtain a reliable tool for patient evaluations.…”

“…1,6,7 Subsequently, adjustments and new domains were added to broaden its scope, thereby creating the revised foot function index (FFI-R). 8 In this version, the visual analogue scale (VAS) was replaced with a Likert scale. The domains and items of the original questionnaire were maintained and others regarding psychosocial characteristics were added.…”

Stakeholders in Outcome Measures: Review From a Clinical Perspective

“…Ankle-Hindfoot Rating [54] Ankle Osteoarthritis Scale [26] Foot and Ankle Ability Measure [1,86] Revised Foot Function Index [14,78] Adult -Upper Extremity DASH [46] Oxford Shoulder Score [21,22] American Shoulder and Elbow Surgeons (ASES) Shoulder Form [77] Oxford Elbow Score [19,20] American Shoulder and Elbow Surgeons (ASES) Elbow Form [53] Adult -Spine AAOS / North American Spine Society (NASS) Spine Form [16] Oswestry Disability Index [30] Pediatric -Musculoskeletal Function Pediatric Orthopaedic Society of North America / Pediatric Outcomes Data Collection Instrument (PODCI) [17] KOOS -Child [70] Pedi-IKDC [55] Volume 471, Number 11, November 2013 Clinical Perspective on Outcome Measures 3429 research effort well before the study commences. Collecting data without a clearly defined research objective or specific questions always leads to a failed project and wasted time and resources.…”