Foot Function Index (FFI)

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Original Editors - Xiomara Hernandez

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Intended Population

A Foot Function Index (FFI) was developed to measure the impact of foot pathology on function in terms of pain, disability and activity restriction. The FFI should prove useful for both clinical and research purposes. It has been shown to be a reasonable tool for use with low functioning individuals with foot disorders and patients with rheumatoid arthritis and non-traumatic foot or ankle problems. It may not be appropriate for individuals who function at or above the level of independent activities of daily living.

Method of Use

The FFI (questionnaire) consists of 23 self-reported items divided into 3 subcategories, namely: pain, disability and activity limitation. The patient has to score each question on a scale from 0 (no pain or difficulty) to 10 (worst pain imaginable or so difficult it requires help), that best describes their foot over the past WEEK. The pain subcategory consists of 9 items and measures foot pain in different situations, such as walking barefoot versus walking with shoes. The disability subcategory consists of 9 items and measures difficulty performing various functional activities because of foot problems, such as difficulty climbing stairs. The activity limitation subcategory consists of 5 items and measures limitations in activities because of foot problems, such as staying in bed all day. Recorded on a visual analogue scale (VAS), scores range from 0 to 100 mm, with higher scores indicating worse pain. Both total and subcategory scores are calculated.

Evidence

Responsiveness

FFI is an instrument that was rated positively (level 3) for responsiveness.

References

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