Foot Function Index Clinical Workflow

Introduction

The Foot Function Index (FFI) was developed to measure the effect of foot problems on function in terms of pain and disability. The FFI is a self-administered index consisting of 23 items divided into 3 scales (Limitation, Pain, and Disability). All the items are rated on a visual analog scale (VAS) and have satisfactory clinimetric properties[1].

The Foot Function Index flow contains the Foot Function Index (FFI) - 5pt questionnaire and associated calculation. After form submission, the Foot Function Index calculation is executed automatically. It's easy to extend this flow with conditional logic based on the interpretation of the Foot Function Index calculation.

Foot Function Index (FFI) - 5pt questionnaire

Questions and Scoring

The items of the FFI-5pt are identical to those of the FFI, but are rated on a 5 point VRS, ranging from “never” (0) to “always” (4) on the Limitation scale, “no pain” (0) to “intense pain” (4) on the Pain scale, and “no difficulty” (0) to “impossible” (4) on the Disability scale. An additional "Not applicable" option is present for every item, however.

Link to see the Dutch items of the questionnaire.

Interpretation

The scores range from 0 to 100; the higher the score, the more limitation/pain/disability is present.

References

[1] Kuyvenhoven MM, Gorter KJ, Zuithoff P, Budiman-Mak E, Conrad KJ, Post MW. The foot function index with verbal rating scales (FFI-5pt): A clinimetric evaluation and comparison with the original FFI. J Rheumatol. 2002 May;29(5):1023-8. PMID: 12022318.