The Foot and Ankle Disability Index (FADI) is a 26-item patient-reported outcome measure that assesses pain and functional limitations of the foot and ankle, originally developed by RobRoy L. Martin, James J. Irrgang, Edward A. Burdett, Debbie Conti, and John F. Van Swearingen in 1999. It was published in the Journal of Orthopaedic & Sports Physical Therapy. The FADI contains 4 pain-related items and 22 activity-related items, each scored from 0 (unable to do) to 4 (no difficulty at all), yielding a maximum total score of 104 points. The FADI is scored as a percentage: (total points earned ÷ 104) × 100, where 100% represents no dysfunction. A companion subscale, the FADI Sport (8 items, maximum 32 points), assesses sport-specific functional demands. Psychometric studies by Hale and Hertel (2005) confirm excellent reliability (ICC = 0.89–0.93) and sensitivity to functional deficits in chronic ankle instability (CAI). Zentake delivers the FADI digitally with automatic percentage score calculation.
To score the FADI, sum all item scores and divide by 104, then multiply by 100 to express as a percentage.
There are no established clinical cutoff thresholds; instead, scores are interpreted relative to baseline and normative data. Research shows that subjects with chronic ankle instability score significantly lower than healthy controls on both the FADI and FADI Sport. Zentake automatically calculates both FADI and FADI Sport percentage scores upon form submission.
Step 1: Identify the appropriate patient population. The FADI is validated for adults with foot and ankle conditions, particularly chronic ankle instability (CAI), ankle sprains, and post-surgical ankle rehabilitation. Both the FADI and FADI Sport may be administered; the Sport subscale is especially useful for athletic patients.
Step 2: Deliver the form digitally or on paper. With Zentake, send the FADI to patients via text or email before their appointment or therapy session. Patients typically complete all 26 items in 5–10 minutes without clinician assistance.
Step 3: Review the auto-calculated percentage scores. Zentake computes the FADI and FADI Sport percentage scores instantly upon submission, eliminating manual calculation and reducing scoring errors.
Step 4: Interpret scores in clinical context. Lower FADI percentages indicate greater disability. Use baseline scores to establish functional status, set rehabilitation goals, and benchmark progress. Compare FADI Sport scores separately for athletic patients to capture sport-specific deficits not reflected by general ADL items.
Step 5: Monitor rehabilitation progress longitudinally. Readminister the FADI at regular intervals throughout the rehabilitation program to track functional recovery. Zentake’s longitudinal tracking dashboard visualizes FADI score trends across treatment episodes.
Scoring: Paper requires manual summation of 26 items and percentage conversion. Zentake computes both FADI and FADI Sport percentage scores instantly and automatically.
Completion: Paper forms require in-office administration. Zentake sends the FADI to patients via text or email for pre-visit or home completion.
Delivery: Paper is limited to in-person settings. Zentake supports telehealth, remote rehabilitation monitoring, and home-based outcome tracking.
Data Storage: Paper responses require manual filing. Zentake stores all FADI results in a HIPAA-compliant cloud environment with full audit capabilities.
Longitudinal Tracking: Paper requires manual comparison across visits. Zentake’s dashboard displays FADI and FADI Sport score trends over the full rehabilitation episode.
Security: Paper forms risk physical loss or unauthorized access. Zentake encrypts all data at rest and in transit.
Integration: Paper cannot connect to EMR or practice management systems. Zentake exports FADI data directly to supported EMR platforms.
Cost: Paper printing, storage, and manual scoring consume staff time. Zentake’s per-provider pricing eliminates these overhead costs.
What does the FADI measure?
The FADI measures pain and functional disability of the foot and ankle. It assesses performance across 22 activities of daily living and 4 pain scenarios, scored as a percentage where 100% represents no dysfunction. Zentake delivers the full 26-item FADI digitally with automatic percentage score calculation.
How do you score the FADI?
Sum all 26 item scores (maximum 104 points) and calculate the percentage: (earned points ÷ 104) × 100. The FADI Sport is scored separately: (earned points ÷ 32) × 100. Zentake performs both calculations automatically upon form submission.
What is a normal FADI score?
Healthy adults without ankle pathology typically score near 100% on the FADI. Research by Hale and Hertel (2005) found that subjects with chronic ankle instability scored significantly lower than healthy controls, demonstrating the scale’s sensitivity to functional deficits. Scores should be interpreted in relation to baseline and functional goals.
How long does the FADI take to complete?
Patients typically complete the FADI in 5–10 minutes. When delivered through Zentake, patients complete it before their appointment or therapy session, saving in-clinic time for treatment.
What conditions is the FADI used for?
The FADI is validated for chronic ankle instability (CAI), acute and recurrent ankle sprains, post-surgical ankle rehabilitation, and other foot and ankle conditions. The FADI Sport subscale is specifically designed for athletes with higher functional demands.
Is the FADI free to use?
The FADI is available in the public domain through its original publication and the Rehabilitation Measures Database. Zentake provides a ready-to-use digital version with automated scoring. Start a free trial at zentake.com.
Who should administer the FADI?
The FADI is a self-report measure completed by the patient. Physical therapists, athletic trainers, orthopaedic surgeons, and sports medicine physicians typically administer and interpret the FADI as part of clinical assessment. No specialized training is required for administration. Zentake automates delivery and score calculation.
What is the difference between the FADI and the FADI Sport?
The FADI (26 items) assesses activities of daily living and pain relevant to general adult populations. The FADI Sport (8 additional items) assesses higher-demand athletic activities such as running, cutting, and jumping — tasks where general ADL items lack sensitivity in athletic populations. Both can be administered together; Zentake scores each separately.
1. Martin, R. L., Irrgang, J. J., Burdett, R. G., Conti, S. F., & Van Swearingen, J. M. (1999). Evidence of validity for the foot and ankle ability measure (FAAM). Foot & Ankle International, 26(11), 968–983.
2. Hale, S. A., & Hertel, J. (2005). Reliability and sensitivity of the foot and ankle disability index in subjects with chronic ankle instability. Journal of Athletic Training, 40(1), 35–40.
3. Eechaute, C., Vaes, P., Van Aerschot, L., Asman, S., & Duquet, W. (2007). The clinimetric qualities of patient-assessed instruments for measuring chronic ankle instability: A systematic review. BMC Musculoskeletal Disorders, 8, 6.
4. Plisky, P. J., Gorman, P. P., Butler, R. J., Kiesel, K. B., Underwood, F. B., & Elkins, B. (2009). The reliability of an instrumented device for measuring components of the star excursion balance test. North American Journal of Sports Physical Therapy, 4(2), 92–99.
Last updated: April 2026
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