The Foot & Ankle Disability Index, or FADI, is a patient-reported outcome measure used to assess foot and ankle function, pain and activity limitation. It can help monitor how a client’s foot or ankle problem affects daily activity and sport, but it does not diagnose a condition, confirm injury or clear someone for sport on its own.
Foot and ankle conditions can affect walking, stairs, running, sport, work tasks, balance confidence and daily activity.
The Foot & Ankle Disability Index, commonly called the FADI, is a patient-reported outcome measure that asks the client to rate difficulty with daily activities and pain related to their foot or ankle.
The FADI is often discussed alongside the FADI Sport subscale, which captures higher-demand activities such as running, jumping and sport-specific function.
It is commonly used for:
ankle sprain
chronic ankle instability
post-injury ankle function
sport-related foot and ankle limitations
return-to-running monitoring
return-to-sport progress tracking
general foot and ankle disability assessment
comparison with other foot and ankle outcome measures
Systematic review evidence has identified the FADI and FAAM as appropriate patient-assessed tools for quantifying functional disability in people with chronic ankle instability, while also noting that measurement properties and meaningful change values vary across instruments and populations.
Outcome measure: Foot & Ankle Disability Index
Abbreviation: FADI
Related scale: FADI Sport
Body region: Foot and ankle
Type: Patient-reported outcome measure
Main purpose: Assess foot and ankle-related disability, pain and function
FADI items: commonly described as 26 items
FADI Sport items: commonly described as 8 items
Scoring direction: Higher percentage scores indicate better function
Lower scores mean: Greater perceived disability or limitation
Best used for: Baseline assessment, reassessment, sport function monitoring and progress tracking
Key limitation: FADI does not diagnose a specific condition or determine return-to-sport readiness on its own
The FADI is a foot and ankle patient-reported outcome measure.
It is designed to assess how a foot or ankle problem affects:
daily function
pain
walking
stairs
standing
personal activities
work or routine activity
higher-level function when FADI Sport is used
The FADI is commonly described as having:
26 total items in the main FADI
22 activity-related items
4 pain-related items
a separate 8-item FADI Sport section for higher-level activity
The main FADI and FADI Sport are usually scored separately.
The Foot and Ankle Ability Measure, or FAAM, was later developed from the FADI framework, with changes including removal of some pain-related items from the activities scale while retaining the Sports subscale structure.
The FADI is used because physical testing alone may not show how a client is experiencing their foot or ankle problem.
A client may have improving range of motion or strength but still report:
difficulty walking longer distances
pain during stairs
poor confidence with uneven ground
difficulty running
reduced sport participation
pain after activity
fear of recurrence
difficulty with work or recreational tasks
The FADI may help professionals:
establish a baseline
measure self-reported disability
monitor change over time
identify daily activity limitations
identify sport-related limitations through FADI Sport
support client education
guide reassessment conversations
combine subjective and objective findings in Measurz
It should be used to support assessment reasoning and progress tracking, not as a stand-alone diagnostic tool.
The FADI measures the client’s perceived difficulty and pain related to foot and ankle function.
It may provide insight into:
daily activity difficulty
walking tolerance
stair function
standing tolerance
pain during functional activity
sport and recreation limitations
higher-level physical function when FADI Sport is included
The FADI does not directly measure:
ligament integrity
tendon structure
joint damage
fracture healing
swelling volume
strength
balance
range of motion
readiness to return to sport
The FADI may be useful for:
exercise professionals
rehabilitation practitioners
strength and conditioning coaches
sport and performance coaches
allied health support teams
movement assessment professionals
students learning outcome measures
professionals using Measurz or MAT for structured progress tracking
It may be relevant for clients with:
ankle sprain
chronic ankle instability
foot pain
ankle pain
post-injury foot or ankle symptoms
sport-related ankle limitations
functional instability symptoms
persistent pain after ankle injury
post-operative foot or ankle rehabilitation, where appropriate
Most published FADI measurement-property research has focused heavily on chronic ankle instability and athletic or active populations, so interpretation should be cautious when applying it to other foot and ankle conditions.
Use the FADI when you want to understand how a foot or ankle problem affects the client’s perceived function and pain.
It may be useful at:
initial assessment
onboarding
post-injury baseline
reassessment
return-to-run planning
return-to-sport planning
after a training block
after a rehabilitation phase
discharge or progress review
Use FADI Sport when the client has higher-level sport or recreation goals.
This may include clients returning to:
running
jumping
cutting
pivoting
field sport
court sport
gym-based performance
recreational sport
Use caution when:
the client cannot understand the questionnaire
language or literacy affects responses
many items are not relevant to the client
the client has multiple body regions affecting function
the score is being used as a clearance decision
the client has not attempted sport but is completing FADI Sport
the wrong version or scoring method is used
missing items are not handled consistently
The FADI should not be used to:
diagnose a condition
confirm a ligament injury
confirm chronic ankle instability
determine tissue healing
explain symptoms on its own
replace physical assessment
replace professional judgement
clear someone for sport
FADI questionnaire
FADI Sport questionnaire, if relevant
Scoring guide or calculator
Measurz recording workflow
Client-reported symptom notes
Baseline and retest dates
Optional related physical measures, such as:
ankle range of motion
weight-bearing lunge test
calf raise testing
foot and ankle strength testing
single-leg balance
Y-Balance Test
hop testing
running assessment
pain score
Explain the purpose of the FADI before the client completes it.
Example wording:
“This questionnaire helps us understand how your foot or ankle is affecting your daily function, pain and activity. It does not diagnose the problem by itself, but it helps us track your progress over time.”
The FADI can be completed:
on paper
digitally
before a session
during reassessment
independently
with assistance if needed
The FADI Sport section should be used when higher-level activity and sport function are relevant.
Ask the client to:
answer based on their current foot or ankle condition
choose the response that best reflects their experience
answer every item where possible
avoid overthinking each response
ask for clarification if they do not understand an item
complete the same version at each retest
Record whether the FADI was completed:
independently
digitally
on paper
verbally
with assistance
This helps with repeatability and interpretation.
If assistance is needed:
explain the instructions without leading the answer
do not tell the client which response to choose
record that assistance was provided
use the same assistance approach at retest where possible
Do not guess missing responses.
If an item is missed:
record the missing item
use the scoring method supported by the version being used
avoid comparing scores if missing item handling differs between sessions
If too many items are missing, record the result as incomplete or interpret cautiously.
Each item is commonly scored on a 0–4 scale.
The main FADI raw score is commonly calculated out of 104 points.
The FADI Sport raw score is commonly calculated out of 32 points.
Scores are often converted to a percentage.
General scoring direction:
Higher percentage score: better function / less disability
Lower percentage score: more disability / greater limitation
Retest at meaningful points, such as:
baseline
after a rehabilitation phase
after a training block
when symptoms change
before return to running
before return to sport
at discharge or review
Record the client’s activity exposure at each retest because scores may change depending on whether they have actually returned to the activities being scored.
The FADI is a self-report questionnaire, so it does not create physical testing risk.
However, worsening scores may indicate the need for:
further assessment
review of training load
review of pain or swelling
referral where appropriate
additional physical testing
The FADI is usually scored as a percentage of the maximum possible score.
Common item count: 26 items
Common raw score range: 0–104
Converted score: percentage
Higher score: better function
Lower score: greater perceived disability
Common item count: 8 items
Common raw score range: 0–32
Converted score: percentage
Higher score: better sport function
Lower score: greater sport limitation
A high FADI score may suggest:
better perceived foot and ankle function
less difficulty with daily tasks
lower symptom impact
better walking or stair tolerance
greater confidence in daily activity
A high FADI Sport score may suggest:
better perceived sport function
better tolerance of higher-level activity
greater confidence with running, jumping or cutting
A low FADI score may suggest:
greater perceived disability
more pain or difficulty with activity
reduced walking or stair tolerance
higher symptom impact
lower confidence
A low FADI Sport score may suggest:
difficulty with high-demand tasks
reduced sport confidence
reduced tolerance of running, jumping or cutting
ongoing limitation despite daily activity improvement
A FADI score does not prove:
the diagnosis
the injured structure
severity of tissue damage
readiness to return to sport
whether the client is safe to progress
whether one intervention caused the change
Example wording:
“Your FADI score suggests your daily foot and ankle function is improving, but the Sport score shows higher-level activity is still more limited. This does not tell us exactly what tissue is involved, but it helps us track how your symptoms are affecting the activities that matter to you.”
For general fitness clients, the FADI may help show how foot or ankle symptoms affect:
walking
stairs
gym training
daily activity
work tasks
recreational exercise
Interpretation cautions:
some sport items may not apply
recent activity can influence answers
pain expectations may affect responses
For athletes, FADI Sport is often especially useful.
It may provide insight into:
running tolerance
jumping confidence
cutting confidence
ability to return to training
sport-specific limitations
Interpretation cautions:
high scores do not equal clearance
sport exposure must be considered
physical testing is still needed
For older adults, the FADI may help track how foot and ankle symptoms affect:
mobility
stairs
standing
confidence
participation
independence
Interpretation cautions:
other conditions may affect responses
general strength and balance may influence function
sport subscale may be less relevant
For youth clients, consider:
reading level
comprehension
parent or guardian assistance
sport exposure
whether all items are relevant
If assistance is provided, record it clearly.
FADI has been studied in chronic ankle instability populations. A systematic review concluded that FADI and FAAM can be considered appropriate patient-assessed tools for quantifying functional disability in this group.
Interpretation should still include:
history of giving way
recurrent sprain history
balance testing
strength testing
hop or functional tests
confidence and sport demands
For clients returning after injury, FADI can help monitor whether perceived function is improving.
However:
high scores should not be used as clearance on their own
FADI Sport should be paired with physical testing
sport-specific exposure should be documented
changes should be compared with baseline
FADI may be used in some post-surgical or post-fracture contexts, but evidence is more condition-specific and should be interpreted cautiously.
Scores may be influenced by:
healing stage
surgical restrictions
pain medication
swelling
weight-bearing status
activity restrictions
medical advice
Meaningful change helps determine whether a score change is likely to matter.
Key terms:
MCID: smallest change that may be meaningful to the client or professional
MDC: amount of change likely needed to exceed measurement error
SEM: estimated measurement error around a score
Responsiveness: ability of the questionnaire to detect change over time
High-quality universal MCID, MDC or SEM values for the FADI across all foot and ankle populations appear limited.
A systematic review of chronic ankle instability outcome measures found that responsiveness was demonstrated for FADI, but reported that only FAAM had a minimal clinically important difference presented among the reviewed instruments.
A clinical resource summary also notes that no MCID had been calculated for FADI at the time of its review, and that many FADI studies were focused on chronic ankle instability, limiting generalisability.
When interpreting FADI change:
compare with the client’s own baseline
look for consistent improvement across daily and sport function
consider whether the client has increased activity exposure
check pain, swelling, strength, ROM and balance changes
use caution with small score changes
avoid treating one score change as proof of recovery
When no matching MCID, MDC or SEM is available, interpretation should rely more heavily on:
repeated measurement
baseline comparison
client goals
pain change
symptom behaviour
function change
sport exposure
related physical assessment findings
professional judgement
Exact normative values for the full FADI across broad populations appear limited.
However, related population-level reference data exist for foot and ankle outcome measures.
A 2020 study aimed to determine normative values for foot and ankle outcome measures, including FAAM ADL and FAAM/FADI Sport, in a sample representative of the normal adult United States population.
This provides useful context, but it is not the same as a universal full FADI reference value.
Practical comparison guidance:
Use the client’s own baseline as the most important comparison.
Compare daily function and sport function separately.
Consider age, sport, activity level and recent exposure.
Use broad reference values as context, not pass/fail criteria.
Avoid comparing full FADI and FAAM scores as if they are identical.
Record the version and scoring method used.
For most Measurz use cases, the best practical comparison is:
baseline score
retest score
activity exposure
symptoms
objective physical test results
client goals
The FADI has post-2000 evidence supporting its reliability and clinical usefulness, especially in chronic ankle instability populations.
A 2005 study examined the reliability and sensitivity of the FADI and FADI Sport in people with chronic ankle instability, supporting their use in athletic and active populations.
The 2007 systematic review of chronic ankle instability instruments reported that:
test-retest reliability was demonstrated for FAOS, FADI and FAAM
responsiveness was demonstrated for FADI and FAAM
FADI and FAAM were considered among the most appropriate patient-assessed tools for chronic ankle instability disability assessment
some measurement-property gaps remained, including limited MCID evidence for FADI
Reliability and validity are stronger when:
the correct version is used
the same scoring method is repeated
all relevant items are completed
FADI and FADI Sport are scored separately
retesting occurs at meaningful time points
results are interpreted alongside physical tests
Interpret cautiously when:
many items are missing
the client has not attempted sport
the score is used without activity exposure context
the score is applied to a population unlike the validation sample
the score is used as a stand-alone clearance decision
Common errors include:
treating FADI as a diagnosis
using FADI as return-to-sport clearance
mixing FADI and FAAM scoring methods
not recording whether FADI Sport was used
not converting scores consistently
ignoring missing items
not recording completion method
comparing scores without considering activity exposure
over-interpreting small score changes
using broad reference values as strict cut-offs
Limitations include:
most evidence is stronger for chronic ankle instability than all foot and ankle conditions
MCID, MDC and SEM values are limited for FADI
self-report is influenced by confidence, expectations and recent activity
sport scores may be misleading if sport has not been attempted
FADI does not identify the exact physical cause of limitation
it should be paired with physical assessment and client goals
The FADI may help professionals:
document baseline function
monitor self-reported progress
compare daily function and sport function
support return-to-running discussions
guide return-to-sport planning
track chronic ankle instability symptoms
improve client education
strengthen Measurz reporting
For athletes, FADI Sport can help monitor higher-demand function during:
running progression
jumping progression
cutting and agility progression
return to training
return to competition
For general population clients, the main FADI may help track:
walking
stairs
standing
daily function
work or recreational activity
For Measurz users, FADI works best when combined with:
ankle dorsiflexion ROM
calf raise testing
single-leg balance
Y-Balance Test
hop testing
strength testing
pain and swelling records
Record:
outcome measure name: Foot & Ankle Disability Index / FADI
version used: FADI, FADI Sport or both
date completed
completion method: paper, digital, interview or assisted
language/version used
condition or presentation being tracked
side involved: left, right or bilateral
FADI raw score
FADI percentage score
FADI Sport raw score, if used
FADI Sport percentage score, if used
score range
direction of scoring: higher score indicates better function
missing items, if any
assistance provided, if any
current pain score, if relevant
current symptoms
current activity or sport exposure
key functional limitations
confidence or participation goals
baseline comparison
related physical assessment findings
interpretation notes
retest date
referral or further assessment notes where appropriate
Record whether the main limitation appears to be:
daily function limitation
sport function limitation
pain-limited function
confidence-limited function
mixed limitation
unclear due to incomplete responses
This improves:
repeatability
communication
client education
assessment reasoning
monitoring over time
team consistency
reporting quality
The FADI measures self-reported foot and ankle disability, including difficulty with daily activities and pain.
FADI Sport is a separate sport-focused section used to assess higher-level activity such as running, jumping and cutting.
The main FADI is commonly scored out of 104 and converted to a percentage. FADI Sport is commonly scored out of 32 and converted to a percentage.
Yes. Higher percentage scores indicate better perceived foot and ankle function.
No. FADI may help quantify functional disability in people with chronic ankle instability, but it does not diagnose the condition on its own.
High-quality universal MCID values for FADI appear limited. A systematic review found responsiveness evidence for FADI but noted that MCID was presented only for FAAM among the reviewed instruments.
FADI Sport can support return-to-sport reasoning, but it should not be used as the only clearance measure. It should be combined with physical testing, sport exposure and professional judgement.
Both can be useful. FADI is commonly used for disability and sport function, especially in ankle instability contexts, while FAOS includes five separate foot and ankle subscales including quality of life.
FADI is a foot and ankle patient-reported outcome measure.
It assesses perceived disability, pain and daily function.
FADI Sport assesses higher-level sport function.
Higher scores indicate better function.
FADI does not diagnose a condition or clear someone for sport.
Evidence is strongest in chronic ankle instability and active populations.
MCID, MDC and SEM values for FADI appear limited.
Measurz should record the version, raw score, percentage score, FADI Sport score, completion method, missing items, activity exposure, baseline comparison and related physical findings.
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. doi:10.1186/1471-2474-8-6
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. PMID:15902322
Houston, M. N., Hoch, J. M., & Hoch, M. C. (2015). Patient-reported outcome measures in individuals with chronic ankle instability: A systematic review. Journal of Athletic Training, 50(10), 1019–1033. doi:10.4085/1062-6050-50.9.01
Martin, R. L., Irrgang, J. J., Burdett, R. G., Conti, S. F., & Van Swearingen, J. M. (2005). Evidence of validity for the Foot and Ankle Ability Measure. Foot & Ankle International, 26(11), 968–983. doi:10.1177/107110070502601113
Matheny, L. M., Clanton, T. O., Rascoe, A. S., Lampley, A., Haytmanek, C. T., & McCarty, E. C. (2020). Patient reported outcome measures in the foot and ankle: Normative values do not reflect 100% full function. Knee Surgery, Sports Traumatology, Arthroscopy, 28, 1267–1273. doi:10.1007/s00167-020-06069-3
Picot, B., Hardy, A., Terrier, R., Tassignon, B., Lopes, R., & Fourchet, F. (2022). Which functional tests and self-reported questionnaires can help clinicians make valid return to sport decisions in patients with chronic ankle instability? A narrative review and expert opinion. Frontiers in Sports and Active Living, 4, 902886. doi:10.3389/fspor.2022.902886
Salar, N., Ghasemi, M. S., Razeghi, M., & Ghotbi, N. (2021). Translation, cross-cultural adaptation, reliability, and validation of the Italian version of the Foot and Ankle Disability Index. Acta Bio-Medica, 91(4), e2020144. PMID:32555091
