Goulart Neto et al.
Journal of Orthopaedic Surgery and Research
https://doi.org/10.1186/s13018-022-02925-9
(2022) 17:38
RESEARCH ARTICLE
Open Access
Validation of Foot and Ankle Ability Measure
(FAAM) and the Foot and Ankle Outcome
Score (FAOS) in individuals with chronic ankle
instability: a cross-sectional observational study
Antonio Manoel Goulart Neto1, Nicola Maffulli2,3,4, Filippo Migliorini5* , Fábio Sprada de Menezes1 and
Rodrigo Okubo1,6
Abstract
Background: Ankle sprain is the most common lower limb injury in physically active individuals. Loss of function,
decreased postural control (PC), strength deficit, and reduced range of motion (ROM) are common after acute lateral
ankle sprains. Some patients experienced long lasting symptoms, with recurrent sprains, and episodes of giving-way:
a condition known as chronic ankle instability (CAI). Evaluating the function in patients with CAI in the clinical environment is important to identify the severity of the condition, in addition to allowing to assess the effectiveness of a
given treatment. The aim of this study was to investigate the validation of the Foot and Ankle Ability Measure (FAAM)
and the Foot and Ankle Outcome Score (FAOS) in terms of muscle strength, PC and ROM in adults with CAI.
Methods: This is a cross-sectional study. Individuals with CAI aged between 18 and 45 years were eligible. Individuals
with CAI were identified using the Identification of Functional Ankle Instability (IdFAI). All patients filled in the FAAM
and FAOS scores. Muscle strength was assessed by manual dynamometry, ROM by the Lunge test, PC by computerized posturography, modified Star Excursion Balance Test (mSEBT) and modified Balance Error Score System (mBESS).
Results: 50 participants were enrolled in the present study. The mean age of the patients was 27.2 ± 6.3 years, and
the mean body mass index was 26.4 ± 4.8 kg/m2. 58% (29 of 50) were men and 42% (21 of 50) women. 18 individuals had unilateral (36%) and 32 bilateral (64%) CAI. The results of FAAM were associated with MCT, mSEBT, invertor
muscles strength, plantar flexor muscles strength, dorsiflexor muscles strength, and external hip rotator muscles
strength (P < 0.05). The results of FAOS were associated with mSEBT, invertor muscles strength, plantar flexor muscles strength, dorsiflexor muscles strength, evertor muscles strength, and external hip rotator muscles strength, and
mBEES (P < 0.05).
Conclusion: Both the FAAM and FAOS demonstrated validity to evaluate postural control and muscle strength in
patients with CAI, while no association was found in relation to ankle dorsiflexion.
Keywords: Ankle, Joint instability, Postural control, Chronic ankle instability
*Correspondence: migliorini.md@gmail.com
5
Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH
University Clinic Aachen, Pauwelsstraße 30, 52074 Aachen, Germany
Full list of author information is available at the end of the article
Background
Ankle sprain is the most common lower limb injury
in physically active individuals [1]. About 70% of the
population experienced one lateral ankle sprain during
lifetime [2, 3]. This injury is associated with high costs
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Goulart Neto et al. Journal of Orthopaedic Surgery and Research
(2022) 17:38
and long absence from work and recreational activities
[1, 4]. Swelling, pain, loss of function, decreased postural control (PC), strength deficit, and reduced range
of motion (ROM) are common after an acute lateral
ankle sprain [1, 5]. Normally, these symptoms last up
to some months [6]. However, some patients experienced long lasting symptoms, with recurrent sprains,
and episodes of giving-way: a condition known as
chronic ankle instability (CAI) [7–9]. Patients with
CAI present alterations of motor patterns, impaired
the quality of life (QoL), and may develop early onset
osteoarthritis [2, 6, 10–13]. After the development
of CAI, 72% of individuals do not return to physical
activities at the same previous level, and 6% are unable
to return to work [14]. Some studies show decreased
function in individuals with CAI compared to those
without, in addition to a higher risk of developing
posttraumatic osteoarthrosis, lower quality of life and
decreased physical activity [2, 4, 15]. Evaluating physical function in patients with CAI in the clinical environment is extremely important to identify the severity
of the condition and plat the treatment, in addition to
allowing to assess the effectiveness of a given treatment [12].
Several instruments measure the function of the
ankle/foot joint complex, but only two are suggested
by the International Ankle Consortium to evaluate
the functional limitations of individuals with CAI: the
Foot and Ankle Ability Measure (FAAM) and the Foot
and Ankle Outcome Score (FAOS). The FAAM has 29
items, scored between 0 and 4, divided into two subscales: activities of daily living (21 items) and sports (8
items) [16, 17, 42]. For score analysis, the percentage of
each subscale is used separately [17]. FAOS consists of
42 items, with scores between 0 and 4, subdivided into
5 subscales: pain (9 items), other symptoms (7 items),
activities of daily living (17 items), sports and recreations (5 items), and quality of life related to ankle and
foot (4 items) [17, 18, 45]. Although these measures
are subjective and based on the individual’s perception
of his or her condition, they provide important information regarding ankle-related physical limitation and
disability [19].
Currently, the variables associated with the development of CAI are still controversial. Greater knowledge
of predisposing factors for CAI is essential to previously identify patients and adopt prompt precautions.
The purpose of this study was to investigate the validation of the Foot and Ankle Ability Measure (FAAM)
and the Foot and Ankle Outcome Score (FAOS) in
terms of muscle strength, postural control (PC), and
range of motion (ROM) in adults with CAI.
Page 2 of 7
Methods
Study design
The present study was conducted according to the Consolidated Standards of Reporting Trials: the CONSORT
statement [20]. This study was approved to the ethics
committee and research on human beings at the State
University of Santa Catarina (ID 2.799.961), and followed
the principles expressed in the Declaration of Helsinki.
All patients were free to participate and able to understand the nature of their treatment, providing written
consent to use their data for research purposes.
Participant recruitment
An analytical, cross-sectional study was conducted
between January and November 2019 in individuals with
CAI at the Department of Physiotherapy of the State University of Santa Catarina, Santa Catarina, Brazil. Individuals were recruited through social networks and posters
in places of great circulation in the Florianopolis region,
Brazil. The criteria for sample selection followed the recommendations of the International Ankle Consortium
[21]. The inclusion criteria were: (1) age between 18 and
45 years, (2) history of ankle sprain, (3) symptoms longer
than 12 months, (4) physical activity interruption for at
least one day (5) last painful ankle episode within the past
3 months, (6) at last two episode of “giving-way” without resulting in sprain in the last 6 months, (7) instability confirmed by the Identification of Functional Ankle
Instability (IdFAI) questionnaire ≥ 11 points [43, 44]. The
exclusion criteria were: (1) previous lower limb surgery,
(2) previous fractures which required realignment, (3)
previous acute musculoskeletal injury to the lower limbs
in the last three months.
Study protocol
Patient demographic variables were collected: gender,
height, age, previous number of sprains, previous treatments, IdFAI questionnaire. Eligible patients were invited
to complete the functional evaluations using two questionnaires: the Foot and Ankle Ability Measure (FAAM),
which assesses the functional limitation of the foot and
ankle [16, 17], and the Foot and Ankle Outcome Score
(FAOS), which is based on the patient’s perception of
the difficulties encountered in relation to the ankle and
foot [18]. According to the International Ankle Consortium, values of the activities of day living < 90% and < 80%
of the sport subscales of the FAAM score, and < 75% of
FAOS score in at least three categories, were considered
as not satisfactory. Patients were invited to our institution to assess PC, muscle strength and ankle dorsiflexion. PC was evaluated by: (1) Motor Control Test (MCT)
using a dynamic computerized posturography (SMART
Goulart Neto et al. Journal of Orthopaedic Surgery and Research
(2022) 17:38
EquiTest, NeuroCom International Inc.); (2) modified Star Excursion Balance Test (mSEBT) to assess the
dynamic PC [22]; and (3) modified Balance Error Scoring System (mBESS) to assess the static PC [23]. To assess
the muscle strength of invertor, evertor, plantar flexors,
dorsiflexor and external hip rotators, a Lafayette® manual dynamometer (Lafayette Instrument, model 01,165,
Lafayette, US) was used. Participants were instructed
how to practice the tests with 50%, 75%, and 100% of
the muscle strength against resistance, and how to produce three valid attempts of isometric contraction for 5 s,
with a 15-s rest period between attempts [24]. Results
were expressed as the mean of the three attempts for
each muscle group in terms of Kilogram force (Kgf ). The
Lunge test was used to assess ankle dorsiflexion (Fig. 1)
[25]. Patients were invited to repeat the test three times.
The measure used was the distance between the hallux
and the wall in cm of the longest range achieved during
the attempts.
Page 3 of 7
Fig. 2 Diagram of the enrolment process
Data analysis
The statistical analyses were performed using the software STATA /MP (StataCorp, College Station, Texas).
A multiple linear model regression analysis through the
Pearson Product-Moment Correlation Coefficient (r)
was used. The Cauchy–Schwarz formula was used for
inequality: + 1 is considered as positive linear correlation, while and − 1 a negative one. Values of 0.1 <| r |< 0.3,
0.3 <| r |< 0.5, and | r |> 0.5 were considered to have small,
medium, and strong correlation, respectively. The overall
significance was performed through the χ2 test, with values of P < 0.05 considered statistically significant.
Results
Patient recruitment
A total of 138 people registered themselves to the online
website recruitment. Of them, 57 presented to our institution. Seven people were excluded: no acute ankle injury
within the last 3 months (n = 1), previous lower limb surgery (n = 4), IdFAI questionnaire < 11 (n = 2). This left 50
participants in the present study (Fig. 2).
The mean age of the sample was 27.2 ± 6.3 years, and
the mean body mass index (BMI) was 26.4 ± 4.8 kg/m2.
58% (29 of 50) were men and 42% (21 of 50) women. 18
individuals had unilateral (36%) and 32 bilateral (64%)
CAI. Demographic characteristics are shown in greater
detail in Table 1.
Outcomes of interest
Fig. 1 Lunge test
FAAM—activities of daily living (ADL) was associated
with MCT (P = 0.01), mSEBT (P = 0.004), invertor muscles strength (P = 0.003), plantar flexor muscles strength
(P = 0.007), dorsiflexor muscles strength (P = 0.04),
and external hip rotator muscles strength (P = 0.04).
FAAM—Sports was associated with invertor muscles
strength (P = 0.002), plantar flexor muscles strength
(P = 0.03). FAOS—Symptoms was associated with
mSEBT (P = 0.03), invertor muscles strength (P = 0.006),
plantar flexor muscles strength (P = 0.01), dorsiflexor
muscles strength (P = 0.01). FAOS—Pain was associated with mSEBT (P = 0.002), invertor muscles strength
(P = 0.0002), evertor muscles strength (P = 0.04), plantar
flexor muscles strength (P = 0.001), dorsiflexor muscles
strength (P = 0.003), and external hip rotator muscles
strength (P = 0.03). FAOS-ADL was associated with
Goulart Neto et al. Journal of Orthopaedic Surgery and Research
(2022) 17:38
MCT (P = 0.002), mSEBT (P = 0.0001), mBEES (P = 0.04),
invertor muscles strength (P = 0.001), plantar flexor muscles strength (P = 0.005), dorsiflexor muscles strength
(P = 0.02), and external hip rotator muscles strength
(P = 0.03). FAOS—Sports and recreation was associated
with MCT (P = 0.02), mSEBT (P = 0.01), invertor muscles strength (P = 0.0006), plantar flexor muscles strength
(P = 0.006), and dorsiflexor muscles strength (P = 0.04).
FAOS—QoL was associated with mSEBT (P = 0.0001),
invertor muscles strength (P = 0.0002), evertor muscles strength (P = 0.02), plantar flexor muscles strength
(P = 0.0003), and dorsiflexor muscles strength (P = 0.005).
The results of the multivariate analyses are shown in
greater detail in Table 2.
Discussion
According to the main findings of the present study, both
the FAAM and FAOS demonstrated reliability to evaluate postural control and muscle strength in patients with
CAI, while no association was found in relation to the
dorsiflexion mobility test. The literature presents previous FAAM and FAOS validations, but only validations
related to reliability with others scales and/or associated
with cross-cultural translations [26–32]. In one of these
studies, Matheny et al. [26] showed that normative values of foot and ankle outcome measures did not reflect
100% function. Therefore, we decided to evaluate posturography, strength and mobility outcomes to validate
these functional scales, verifying whether some of them
are associated with the scores of CAI patients.
Frequently, studies on CAI use the assessments of
physical components to try to elucidate how their development and associated factors occur, and/or improve the
Table 1 Participant demographics
Participants (N = 50)
Age (years)
27.2 ± 6.3
Weight (kg)
79.0 ± 16.4
Height (cm)
BMI
172.4 ± 9.2
26.4 ± 4.8
IdFAI
27.2 ± 7.4
FAAM ADL
82.4 ± 15.4
FAAM sport
69.8 ± 19.6
FAOS symptom
69.2 ± 17.8
FAOS pain
81.1 ± 14.5
FAOS ADL
88.4 ± 14.0
FAOS sport
70.7 ± 24.9
FAOS quality of life
52.4 ± 24.2
BMI, body mass index; IdFAI, Identification of Functional Ankle Instability; FAAM,
Foot and Ankle Ability Measure; ADL, activities of daily life; FAOS, Foot and Ankle
Outcome Score
Page 4 of 7
therapeutic approach, and the use of tools that can measure the function of this population, as an outcome has
been growing [2]. Muscle strength, PC and ROM deficits
present in CAI contribute to worsening of function in
these individuals [2, 25]. In addition, several studies have
shown that it is possible to positively modify function in
individuals with CAI through interventions focused on
improving these deficits, especially with balance training [2]. In this study, we found that FAAM and FAOS are
reliabile measure dynamic postural balance, demonstrating moderate to strong association in most of FAAM and
FAOS domains. It is worth mentioning the strong association with the ADL and QoL subscales in FAOS, which
may be directly linked to the presence of sensory alterations, such as PC deficit [12].
In the literature, strength deficits are consistently present in individuals with CAI [7, 33], and many interventions are based on the improvement of this and other
dysfunctions aimed at improving the function of these
individuals [34], although there is no evidence to support
the use of muscle strengthening as an isolated strategy
to improve function in this population [2]. Our results
demonstrate reliability of FAAM and FAOS to evaluate functional muscle strength, since they demonstrate a
moderate association of muscle strength of invertor and
plantiflexors with all subscales of the questionaries and
to a lesser degree to the ankle dorsiflexor, external hip
rotators and ankle evertor. Even though there is an association between strength and function measures, some
studies hypothesise that muscle strength does not play
an important role in decreasing function in CAI [35–37],
and that more important would be proper activation during functional tasks [2, 35–37]. On the other hand, other
studies put forward the idea that the functional loss associated with CAI may result from the limitations imposed
by the various deficits present in this population, including the loss of muscle strength [12, 21].
Among the various factors investigated in the literature, ROM is listed as possibly associated with the onset
and maintenance of prolonged symptoms [2]. Although
some studies demonstrate an association between ROM
and function [25, 38] our findings corroborate another
study [33] that shows no association between ROM and
function (FAOS and FAAM).
CAI is a complex and multifactorial condition, and the
perception of function through questionnaires can be
influenced not only by biological factors, but also by the
social and psychological demands of each individual [7].
The path to the development of deficits in CAI is not well
understood, but it is present and may be the main reason
for making this population less physically active [11, 39].
Decrease in the level of physical activity may be one of
the factors that contribute to maintaining or worsening
Goulart Neto et al. Journal of Orthopaedic Surgery and Research
(2022) 17:38
Page 5 of 7
Table 2 Results of the multivariate analysis
Variables
FAAM
FAOS
ADL
Sports
Symptoms
Pain
ADL
Sports and
recreation
QoL
Postural control
MCT
− 0.35
0.01
− 0.18
0.2
− 0.22
0.1
− 0.26
0.06
− 0.43
0.002
− 0.34
0.02
− 0.28
mSEBT
0.40
0.004
0.28
0.05
0.31
0.03
0.43
0.002
0.51
0.0001
0.34
0.01
0.51
mBEES
− 0.26
− 0.19
0.2
− 0.02
0.9
− 0.27
0.06
− 0.30
0.04
− 0.18
0.2
− 0.26
0.1
0.05
0.0001
0.06
Muscle strength
Invertor
0.42
0.003
0.43
0.002
0.38
0.006
0.50
0.0002
0.44
0.001
0.47
0.0006
0.50
0.0002
Evertor
0.24
0.1
0.24
0.1
0.20
0.2
0.30
0.04
0.26
0.07
0.24
0.09
0.33
0.02
Plantar flexors
0.38
0.007
0.31
0.03
0.36
0.01
0.45
0.001
0.39
0.005
0.38
0.006
0.49
0.0003
Dorsiflexor
0.29
0.04
0.23
0.1
0.29
0.04
0.41
0.003
0.33
0.02
0.29
0.04
0.39
0.005
External hip rotators
0.30
0.04
0.16
0.3
0.21
0.2
0.31
0.03
0.30
0.03
0.26
0.06
0.23
0.1
0.19
0.2
0.11
0.4
0.13
0.4
0.21
0.1
0.20
0.2
0.19
0.2
0.22
0.1
Ankle dorsiflexion
Lunge test
FAAM, Foot and Ankle Ability Measure; ADL, activities of daily life; QoL, quality of life; FAOS, Foot and Ankle Outcome Score; MCT, Motor Control Test; mSEBT, modified
Star Excursion Balance Test; mBESS, modified Balance Error Scoring System
the deficits over the years [40]. In addition, Lee et al.
[41] reported that the unaffected contralateral ankles of
individuals with CAI also showed significant decreases
in postural stability and neuromuscular control, and one
should consider the non-injured limb and the activity of
these patients to prevent future events of contralateral
sprain. Within the multifactorial and not yet fully understood panorama of this condition, our study reinforces
the importance of using specific questionnaires for evaluation and follow-up of patients with CAI, demonstrating
that functional worsening is associated with a worsening
of muscle strength and PC.
This study has several limitations. Only individuals
with CAI aged 18–45 years were included, which potentially increases the risk of selection bias of the present
work. The level of physical activity and kinesiophobia,
or questionaries related to quality of life were not additionally administered. The outcome variables of interest
at the time of evaluation were not adjusted according
to the duration of symptoms. Moreover, participants
were recruited through social networks and posters in
places of great circulation in the Florianopolis region.
This methodology of recruitment process may have led
to increase the risk of selection bias. Moreover, no control group was included, which may enhance the risk of
detection bias.
Despite several studies over many years, the risk factors
in CAI are not fully understood. We were unable to identify additional studies which validated functional questionnaires in individuals with CAI. Current practice can
benefit from the FAAM and FAOS, as they demonstrated
to be valid and available tools to assess postural control
and muscle strength in patients with CAI. These questionnaires can be easily used in current clinical practice,
are easy to apply and free from specialised instrumentation and equipment.
Conclusion
Both the FAAM and FAOS demonstrated validity to evaluate the postural control and muscle strength in patients
with CAI, while no association was found in relation to
ankle dorsiflexion. This study demonstrated that function
assessment is an important measure in patients with CAI
in the clinical setting. The latter may be useful to identify
the severity of instability. Further studies should validate
the FAAM and FAOS as potential tools to monitor the
efficacy of rehabilitation and postoperative care (Additional files 1 [43], 2 [44], 3 [45], 4 [18], 5 [42], 6 [16]).
Abbreviations
PC: Postural control; ROM: Range of motion; CAI: Chronic ankle instability; QoL:
Quality of life; FAAM: Foot and Ankle Ability Measure; FAOS: Foot and Ankle
Outcome Score; CONSORT: Consolidated Standards of Reporting Trials; IdFAI:
Identification of Functional Ankle Instability; MCT: Motor Control Test; mSEBT:
Modified Star Excursion Balance Test; mBESS: Modified Balance Error Scoring
System; Kgf: Kilogram force; r: Pearson Product-Moment Correlation Coefficient; BMI: Body mass index; ADL: Activities of daily life.
Supplementary Information
The online version contains supplementary material available at https://doi.
org/10.1186/s13018-022-02925-9.
Additional file 1. Identification of Functional Ankle Instability (IdFAI) questionnaire- English version
Goulart Neto et al. Journal of Orthopaedic Surgery and Research
(2022) 17:38
Additional file 2. Identification of Functional Ankle Instability (IdFAI) questionnaire - Brazilian version.
2.
Additional file 3. Foot and Ankle Outcome Score (FAOS) questionnaire English version.
Additional file 4. Foot and Ankle Outcome Score (FAOS) questionnaire Brazilian version.
Additional file 5. Foot and Ankle Ability Measure (FAAM) questionnaire English version.
Additional file 6. Foot and Ankle Ability Measure (FAAM) questionnaire Brazilian version.
Acknowledgements
Not applicable.
Authors’ contributions
AMGN: Design of the study, acquisition of data, writing; FM: Statistical analyses,
revision, final approval; FSM: Design of the study; NM: interpretation of
results, final approval; RO: Design of the study, writing, revision, final approval.
All authors read and approved the final manuscript. All authors read and
approved the final manuscript.
Funding
Open Access funding enabled and organized by Projekt DEAL. This research
did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
3.
4.
5.
6.
7.
8.
9.
10.
Availability of data and materials
The datasets used and analysed during the current study are available from
the corresponding author on reasonable request.
11.
Declarations
13.
Ethics approval and consent to participate
This study was approved to the ethics committee and research on human
beings at the State University of Santa Catarina (ID 2.799.961), and followed
the principles expressed in the Declaration of Helsinki. All patients were free
to participate and able to understand the nature of their treatment, providing
written consent to use their data for research purposes.
Consent for publication
All the author approved the manuscript.
12.
14.
15.
16.
Competing interests
NM is the Editor in Chief of the Journal of Orthopaedic Surgery and Research.
17.
Author details
1
Department of Physiotherapy, State University of Santa Catarina, 358 Pascoal
Simone Street, Florianopolis, SC 88080350, Brazil. 2 Department of Orthopaedics, School of Medicine, Surgery and Dentistry, University of Salerno, 132 Via
Giovanni Paolo II, 84084 Salerno, Italy. 3 School of Pharmacy and Bioengineering, Faculty of Medicine, Keele University, Newcastle ST5 5BG, UK. 4 Centre
for Sports and Exercise Medicine at Queen, Mary University of London, Mile
End Rd, Bethnal Green, London E1 4NS, UK. 5 Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH University Clinic Aachen,
Pauwelsstraße 30, 52074 Aachen, Germany. 6 Physiotherapy Postgraduate
Program, State University of Santa Catarina, 358 Pascoal Simone Street, Florianopolis, SC 88080350, Brazil.
18.
19.
20.
Received: 20 November 2021 Accepted: 6 January 2022
21.
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