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ISSN: 2329-910X
Clinical Research on Foot & Ankle
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Economic Evaluation of a Soft Ankle Brace Compared to Tape in Acute Lateral Ankle Ligamentous Sprains

Ellen Kemler1*, Mark R Krist1, Ingrid GL van de Port1,2, Arno W Hoes3, G Ardine de Wit3,4 and Frank JG Backx1

1Rudolf Magnus Institute of Neuroscience, Department of Rehabilitation, Nursing Science and Sports, University Medical Centre Utrecht, The Netherlands

2Revant Rehabilitation Centre, Breda, The Netherlands

3Julius Center for Health Sciences and Primary Care, University Medical Centre Utrecht, The Netherlands

4National Institute of Public Health and the Environment, Bilthoven, The Netherlands

Corresponding Author:
Ellen Kemler
Rudolf Magnus Institute of Neuroscience
Department of Rehabilitation, Nursing Science and Sports
University Medical Centre Utrecht, W01.121
P.O. Box 85500, 3508 GA Utrecht, The Netherlands
Tel: + 31 6 16242309
Fax: + 31 88 7555450
E-mail: [email protected]

Received Date: May 02, 2016; Accepted Date: October 21, 2016; Published Date: October 28, 2016

Citation: Kemler E, Krist MR, Van de Port IGL, Hoes AW, Ardine de Wit G, et al. (2016) Economic Evaluation of a Soft Ankle Brace Compared to Tape in Acute Lateral Ankle Ligamentous Sprains. Clin Res Foot Ankle 4:212. doi:10.4172/2329-910X.1000212

Copyright: © 2016 Kemler E, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Background: Ankle sprains are common injuries, associated with high healthcare and societal costs. After sustaining an acute ankle sprain, ankle taping is the standard treatment in the Netherlands. Ankle braces are sometimes used as an alternative. The aim of the present study was to assess the costs-effectiveness of soft ankle bracing compared to ankle tape treatment in patients with an acute lateral ankle ligamentous sprain (ALALS).
Methods: We conducted an economic evaluation from a societal perspective alongside a controlled trial. In order of presentation, patients were alternately allocated to four week treatment with a soft ankle brace or four week treatment with ankle tape. Costs and clinical outcomes with respect to re-injuries were derived from online patient questionnaires at 5, 9, 13, 26, 39, and 52 weeks after inclusion. Univariate and probabilistic sensitivity analyses were performed. Cost-effectiveness was assessed using bootstrapping with 5000 replications.
Results: In total 157 patients with an ALALS were included, of which 151 (tape n=76, brace n=75) were analyzed. After one-year of follow-up, no significant clinical differences were found between both treatments groups. Mean total costs were €1,634 (SD 261) per patient in the brace group and €1,846 (SD 296) per patient in the tape group; mean difference -€212 (95%CI -854 to 436). The use of an ankle brace was less expensive in 71% of the bootstrap replications.
Conclusions: In patients with ALALS, soft ankle bracing compared to ankle taping had similar clinical effect. The costs of soft bracing were lower. However, this difference was not statistically significant.


Ankle sprain; Soft brace; Ankle tape; Cost-effectiveness; Re-injuries


The lateral ankle sprain is one of the most common injuries. Incidence rates of 1.5-7 per 1000 person-years have been reported in emergency departments in the general European population [1-3]. The total number of ankle injuries (medically and non-medically treated) related to sports activities and other activities of daily living increased from 19.0 to 26.6 per 1000 person-years over the period 2000-2010 [1]. In the Netherlands, the number of sports-related ankle injuries is estimated to be 650.000 each year [4].

The mean total costs of an ankle sprain were estimated at €360.60 [5], corresponding to a total cost of €234 million a year. These high direct healthcare costs are the result of medical consumption, (sometimes longstanding) rehabilitation [6,7], persistent residual symptoms [6-8] and high recurrence rates [6,9,10].

Furthermore, ankle sprains may cause sick leave, especially in the first period after the trauma [11]. The mean duration of sick leave of medically treated ankle sprains is 2.5 weeks in the Netherlands, with 90% having resumed work after 6 weeks [12].

After the acute phase, the current trend in treatment of ALALS is functional treatment [11,13-15], as it is shown to be more effective compared to treatment using immobilization [11,16,17].

Reviews and guidelines therefore recommend functional treatment of ALALS [18,19], although a short-period of immobilization might be desirable in the acute phase of severe ankle sprains to reduce pain and swollen ness [15,20].

Functional treatment consists of early-mobilization and weightbearing with semi-rigid external support, combined with neuromuscular training [6,21].

For external support an ankle brace or tape can be used. A recent review of Lin et al. concluded that the current evidence regarding costs-effectiveness of ankle sprain treatment is limited [22].

The aim of the present study was to compare the costs-effectiveness of soft ankle bracing and ankle tape treatment in patients with an ALALS.


Participants and setting

This economic evaluation was carried out alongside a pragmatic controlled trial. Details of the study design have been published elsewhere [23]. In summary, patients with an ALALS were eligible for the study. They were recruited from 20 general practitioner practices, 9 physiotherapist practices and 2 emergency departments (EDs). Patients (both athletes and non-athletes) had to be 18 years or older and diagnosed with an ALALS caused by an inversion trauma and were recruited between May 2006 and October 2008. Patients were excluded if they sustained an eversion ankle sprain, multilevel or complex injury, or previously had surgery of the same ankle. Patients diagnosed as having a mental illness or cognitive impairment were also excluded from this study.

Study design and procedure

All eligible patients were referred to the UMC Utrecht Department of Sports Medicine. The research assistant contacted the patients by phone and conducted the first screening for inclusion and exclusion criteria (age, multiple trauma, complicated trauma, history of surgery) by means of a short standard questionnaire. If patients were eligible for inclusion, the research assistant allocated them to the brace or tape group based on the order of presentation. To check if the patients were indeed eligible for inclusion, a sports physician conducted a baseline assessment. The protocol was approved by the medical ethics committee (Institutional Review Board) of the University Medical Centre Utrecht (UMCU) and was registered in the Dutch trial register (ISRCTN92030205). Written informed consent was provided by all patients.


All patients were treated with Immobilization, Compression, and Elevation (ICE) during the first 2-12 days after the onset of the ALALS. The duration of the ICE treatment depended on the swollenness of the injured ankle. The allocated intervention started as soon as possible, but at least within 14 days after the initial trauma [23].

Patients in the brace group received instructions from the sports physician about using and applying the soft brace. They were instructed to wear the soft ankle brace for four weeks, except at night and when taking a shower. The soft ankle brace (type Push; manufacturer NEA Int) is based on the principle of functional ankle tape bandage. The control group received the usual care in the Netherlands, namely four weeks of ankle taping [24]. According to daily practice, the athletic tape bandage was applied by the general practitioner, primary care assistant, physical therapist, or plaster technician. After 2 weeks the tape was replaced.

Sample size

The incidences of ALALS recurrences were expected to be similar in both treatment groups. However, a clinically worthwhile difference for interventions, (i.e., the difference or the ratio of the cumulative incidence of re-injury between the two treatments) was not available to use for an a priori sample size calculation. Thus, we aimed to include as many participants as possible in this study within a period of 30 months.

Data collection and outcomes

After informed consent was obtained, baseline data were obtained by the sports physicians. These data consisted of standardized history taking and a physical examination of the ankles. At fixed times after inclusion (5, 9, 13, 26, 39 weeks), patients received a (digital) questionnaire. Information was registered about ankle re-sprains, residual symptoms, compliance with the allocated treatment, absenteeism from paid- and unpaid work (hours) and from school, sport resumption, medical consumption (volumes of medical resources used) and costs of treatments (out-of-pocket costs). One year after treatment allocation, all patients were invited for a reassessment by one of the sports physicians.

All the sports physicians received a standardized training on assessing the outcomes. This assessment included the same physical examination as at baseline and completion of a final questionnaire as indicated above.

In this economic evaluation, the primary clinical outcome was the proportion of patients reporting re-sprains within one-year follow-up after the initial ALALS. A re-injury was defined as a new inversion trauma at the same ankle, as reported by the patient.

Economic framework

Economic analysis was performed from a societal perspective [25,26]. The economic evaluation was designed as a cost-effectiveness analysis (CEA) [25]. The difference in mean total costs per patient between both treatment groups and the mean difference in number of recurrent ankle sprains between the groups were calculated. Discounting was not applied as the time horizon of this study did not exceed 1 year.


All costs within one-year related to the initial ALALS or a recurrent ankle sprain were registered. Costs were divided in intervention costs, direct healthcare costs (medical costs), direct non-healthcare costs (patient costs, i.e., related to use of complementary medicine and medical devices) and indirect non-healthcare costs.

The first contact moment (after onset of injury) with a general practitioner (GP), physiotherapist or visit to an emergency department (ED) was not reported by all patients. Intervention costs for patients in the brace group were therefore standardized to one ED visit and the costs of the soft ankle brace.

The intervention costs for patients in the tape group were determined as one ED visit, one GP visit (guideline directed refreshment of tape after two weeks) and ankle tape. The total costs were the sum of intervention costs, direct healthcare costs, direct nonhealthcare costs and indirect non-healthcare costs.

The mean costs per patient in both treatment groups were calculated. Cost calculations were performed according to the Dutch guidelines for cost calculations in healthcare [25]. All costs were calculated for the year 2009, the last year of data collection for the clinical study.

Direct healthcare costs

The direct healthcare costs consisted of costs for visiting the GP, medical specialist, physical therapist, and costs related to diagnostic testing (i.e., imaging, including ultrasound), and medication. Medication use was reported by the patient.

Medication costs were estimated on the basis of prices communicated by the Pharmacotherapeutical Compass (2009) as provided by the Dutch Healthcare Insurance Board [27]. Costs were computed by multiplying the volumes of use by standardized costs prices.

Direct non-healthcare costs

The direct non-healthcare costs consisted of costs for complementary medicine consultation and medical devices. These costs were analysed as reported by the patient.

Indirect non-healthcare costs

Costs related to absenteeism from (un)paid work and school were incorporated as indirect non-healthcare costs. In this study the maximum reported period of productivity-losses was 13 weeks. The costs per hour for productivity losses related to a paid job was based on age and sex dependent income of the Dutch population (see Appendix A). A shadow price of €12.50 per hour was applied to productivity loss for household and volunteer work [25]. To calculate the costs for absenteeism from school the costs price for employing someone at the age of 23 (net minimal youth wages) was used (set at €8.07 per hour) [25].

Statistical analysis

Differences in costs and effects were analysed according to the intention-to-treat principle. Baseline characteristics between both groups were analysed with Chi-square test or Fisher-exact test for dichotomous outcome and the independent student t-test or Mann- Whitney for continuous variables. The differences in the proportion of ankle sprains recurrences between the brace and tape two group were analyzed using Chi-square analyses, controlling for differences between the two groups at baseline.

Cost-effectiveness pairs were obtained by bootstrapping with 5000 replications. Cost-effectiveness planes were obtained by plotting the incremental costs (vertical axis) against the incremental effects (horizontal axis) of each single bootstrap [28]. Four sensitivity analyses were performed: 1) from a health care perspective, i.e., only including healthcare costs and excluding all costs outside health care; 2) with complete cases only (66 in the brace group and 68 in the tape group), excluding cases with missing data; 3) with exclusion of costs for absenteeism from unpaid work and school, i.e., only including productivity losses associated with paid work; and 4) with exclusion of seven participants who sustained other ankle injuries than an ankle sprain (e.g. ankle fracture or overload injury).

Participants were asked to fill out six questionnaires during one year follow-up. Eleven percent of the cases (n=17) in our study were not fully complete at the end of our clinical trial. Costs relating to missing health care resources use, out of pocket costs, and productivity losses (3.9% of all our data points) were imputed using the last observation carried forward. Multiple imputation was used to assess missing data (n=12) for ankle sprain recurrences.

The analyses were performed using IBM SPSS 23.0 for Windows and Microsoft Excel. All tests were two-tailed and a p value <0.05 was considered statistically significant.


Of the total 164 patients who were assessed for eligibility in this study, seven patients were excluded for different reasons (Figure 1). After allocation, another 6 participants were excluded because they were unwilling to complete any study questionnaire (brace=2, tape=4).


Figure 1: Flowchart of research groups.

The mean age of the 151 included participants was 31.1 years (range 18 to 64 years); 66 participants (44%) were female. The allocated treatment started on average 6.0 days (SD 2.3) and 5.9 days (SD 2.0) after the initial injury in respectively the brace and tape group. No significant differences were found between the two groups at baseline (Table 1).

Characteristics Brace (n=75) Tape (n=76)
Gender, male (%) 41 (55%) 44 (58%)
Age, meanyears (SD) 30.4 (11.1) 31.7 (12.2)
Severity of ankle spraina    
Mild (%) 26 (35%) 17 (22%)
Moderate (%) 38 (51%) 45 (59%)
Severe (%) 11 (15%) 14 (18%)
History of ankle sprain    
Yes, n (%) 32 (43%) 24 (29%)
No, n (%) 32 (43%) 42 (55%)
Unknown, n (%) 11 (15%) 12 (16%)
Sports participants 65 (87%) 63 (83%)
Time from injury to start of treatment (days) 6.0 (2.3) 5.9 (2.0)
Patients with paid jobb 66 (88%) 64 (84%)
Type of work (sitting n (%)) 35 (53%) 36 (56%)
Mean hours of paid work (SD) 28.4 (15.3) 25.9 (16.7)
Studentsb 17 (22%) 23 (30%)
Mean hours of study(SD) 23.9 (12.4) 26.4 (16.7)

Table 1: Baseline characteristics treatment groups.
aSee appendix B
b25 students had a paid job (brace=11, tape=14)

Effects of intervention

Within 52 weeks after the initial trauma, 16 of the 75 participants (21%) in the brace group compared to 17 of the 76 participants (22%) in the tape group reported a re-injury, corresponding to a risk difference of 1.0% (95% CI -12% to 14% and a relative risk of 1.0 (95%CI 0.5 to 1.8).

Cost effectiveness

Table 2 shows the unit costs, volumes of healthcare resources use and mean costs per patient for both treatment groups. The mean total costs were €1,639 (SD 2,271; brace group) and €1,846 (SD 2,624; tape group). After bootstrapping, the mean total costs were €1,634 (SD 261) per patient in the brace group and €1,846 (SD 296) per patient in the tape group (Table 3). The mean difference was not statistically significant (-€212 (95%CI -854 to 436). Direct healthcare costs with a mean difference of €94 (95%CI -116 to 341) and indirect nonhealthcare costs with a mean difference of -€315 (95%CI -846 to 198) were not significantly different between the groups. The direct nonhealthcare costs per patient were lower in the intervention group with a mean difference of -€31 (95%CI -49 to -15). The mean difference in total costs was mainly caused by a difference in indirect non-health care costs (€973 in the brace group compared to €1,289 in the tape group).

  Brace (n=75) Tape (n=76)
  Cost per Unit Volumes Mean costs (€;SD) Volumes Mean costs
(€; SD))
Intervention costs          
Accidents and Emergency (one visit)a 151.00 - 151.00 - 151.00
General practitioner (one visit)a 28.00 - - - 28.00
Braceb / Tapea 80.00/12.90 - 80.00 - 12.90
 Intervention costs per patient   - 231.00 - 191.90
Direct healthcare costs          
General practitioner (per visit)a 28.00 62 23.15 (55.50) 98 36.11 (61.14)
General practitioner (phone consultation)a 14.00 10 1.87 (7.39) 22 4.05 (15.00)
General practitioner (home consultation)a 43.00 3 1.72 (14.90) 5 2.83 (17.67)
Medical specialista 129.00 61 104.92 (244.29) 65 110.33 (285.52)
Therapista,c 36.00 531 254.88 (1028.34) 313 148.26 (289.85)
Hospital stay; day care (days)a 251.00 0 0(0.0) 1 3.30 (28.79)
Supplementary diagnosticsa          
- Ultrasound 48.30 3 1.93 (12.40) 2 1.27 (11.08)
- Radiograph 42.70 17 9.68 (29.43) 17 9.55 (24.75)
- MRI-scan 184.50 6 14.76 (78.86) 4 9.71 (41.47)
- CT-scan 180.77 1 2.41 (20.87) 1 2.38 (20.74)
- Bone scan 150.50 0 0 (0.0) 0 0 (0.0)
Medicationd Variabled 7 4.85 (10.95) 4 3.16 (13.32)
Total direct healthcare costs     420.80 (1,094.01)   326.57 (580.78)
Direct non-healthcare costs          
Complementary medicine (per visit)e According to
Patient specification
4 3.33 (21.31) 17 7.50 (65.38)
Medical devices (i.e., insoles, cold packs, wheelchair)c According to
Patient specification
0.2 6.39 (23.23) 0.9 32.66 (57.31)
Total direct non-healthcare costs     9.72 (30.83)   40.16 (84.04)
Indirect non-healthcare costs          
Absenteeism - paid workf See Appendix A 2547 844.50 (1514.89) 3090 1005.45 (2008.63)
Absenteeism - unpaid work 12.50 672 112.00 (205.43) 1564 257.24 (427.37)
Absenteeism – school 8.07 198 21.30 (117.33) 237 25.17 (69.51)
Total indirect non-healthcare costs     977.81 (1,600.44)   1287.86 (2284.50)
Total costs          
Total costs per patient     1,639.32(2,270.51)   1,846.49 (2,623.70)

Table 2: Mean (standard deviation) intervention costs, direct healthcare, direct non-healthcare costs, indirect non-healthcare and total costs (€) for both treatment groups.
aPrices according to Dutch guidelines for health care costs [26]
bPrice for the soft brace obtained from the manufacturer
cIncluding cost for consultations with the physiotherapist, manual therapist, occupational therapist and caesar therapist
dDrug prices according to the Pharmacotherapeutical Compass as provided by the Dutch Healthcare Insurance Board [27]
eOut-of-pocket costs for use of complementary medicine and medical devices were registered by the patient
fIndirect costs for paid work was calculated by age and sex specific income of the Dutch population [26]

  Brace(n=75) Tape (n=76) Mean difference 95% CI of difference
  Lower Upper
Intervention costs 231.00 191.90 39.10    
Direct healthcare costs 419.86(123.74) 325.64(65.76) 94.22 -116.37 340.54
Direct non-healthcare costs 9.75(3.52) 40.36(9.70) -30.61 -48.94 -14.81
Indirect non-healthcare costs 973.42(184.92) 1,288.53 (256.79) -315.12 -845.87 197.65
Total costsa 1,634.03(261.13) 1,846.43(295.54) -212.41 -854.20 436.45

Table 3: Mean (SD) of costs per patient in Euro and mean differences (95% confidence intervals)a between treatment groups in one year.
aobtained by calculating bootstrap confidence intervals

From a cost perspective, the ankle brace was associated with fewer costs in 71% of bootstrap replicates. The cost-effectiveness plane with all incremental cost effectiveness ratios (5000 bootstrap samples) is presented in Figure 2. The bootstrap analyses (Table 3) showed that treatment with a soft ankle brace was cost-saving and more effective in 38% of the bootstrap replicates and cost-saving but less effective in 33%.


Figure 2: Cost-effectiveness plane presenting costs and effect pairs after bootstrapping (5000 samples).

Sensitivity analysis

Four sensitivity analyses were performed (Table 4). Three of the four sensitivity analyses underline the results of the primary analysis showing that the soft ankle brace is less expensive (in 56% to 87% of the bootstrap replicates).

Analyses Δ Cost (€)
Δ Effect (€)
North East# South East? South West¥ North West?
Base case analysis:
Societal perspective
(-854 to 436)
(-0.0960 to 0.1167)
0.16 0.38 0.33 0.13
Sensitivity analyses:
Healthcare perspective
(-81 to 380)
(-0.0960 to 0.1168)
0.47 0.12 0.06 0.36
Complete cases -486
(-1,157 to 208)
(-0.0775 to 0.1448)
0.09 0.64 0.24 0.03
Only including productivity losses associated with paid work -55
(-660 to 552)
(-0.0963 to 0.1167)
0.26 0.31 0.25 0.18
Excluding patients with other ankle injuries than acute lateral ankle sprain -175
(-858 to 488)
(-0.1327 to 0.0770)
0.12 0.23 0.43 0.22

Table 4: Results of sensitivity analyses.
Δ Cost is the mean difference in the costs of 5000 bootstrapped samples
Δ Effect is the mean difference in the effect of 5000 bootstrapped samples
# Soft brace is more effective and more costly than tape
? Soft brace is more effective and less costly than tape
¥ Soft brace is less effective and less costly than tape
? Soft brace is less effective and more costly than ankle tape


In this study comparing the effect and costs of soft brace treatment and ankle tape treatment in ALALS, a non-significant injury reduction was accompanied by a non-significant cost saving. However, according to the cost-effectiveness analysis, treatment with a soft ankle brace was less expensive in 71% of the 5000 samples. In 29% ankle brace treatment was cost-saving and more effective. Three of the four sensitivity analyses underline the results of the primary analysis showing that the soft ankle brace is less expensive (in 56% to 87% of the bootstrap replicates). Importantly, this difference is mainly attributable to productivity losses which occur at the own expense of patients.

Previous studies, on the cost-effectiveness [29] and cost-savings [30] of external supports in the treatment of ALALS, showed significant reduction of direct and/or indirect costs in favor of the ankle brace. Leanderson and Wredmark [30] found a significant reduction in sick leave, resulting in lower indirect costs, with an Air-Stirrup ankle brace treatment compared to compression bandage. In a study of Lamb et al. [15,29] regarding severe ankle sprains, the Aircast® brace and 10-day below-knee cast™ were more cost-effective, in terms of costs per quality adjusted life years (QALYs), compared to Tubigrip®. In the current study, the soft brace was not more cost-effective than an ankle tape after one year of follow-up. However, our study differs from the aforementioned studies with respect to the kind of ankle brace used, the reference treatment (tape versus compression bandage in other studies) and the severity of ankle sprains.

Verhagen et al. estimated the mean total costs (direct health care costs and indirect non-health care costs) of one ankle sprain at €360.60 [5]. The mean costs per patient in our study were much higher. In our study costs are reported per participant and not per ankle sprain. All 151 participants in our study had an ankle sprain (the initial ankle sprain), 33 participants (20%) had at least one ankle sprain recurrence.

Furthermore, all our participants sought medical treatment for their initial ankle sprain (inherent to the inclusion criteria), compared to 79% only in the study by Verhagen et al. [5]. In 2013 mean direct medical costs and indirect non-healthcare costs related to ankle injuries treated at ED’s in the Netherlands were €1,710 for patients aged 15-34 and €3,070 for patients aged 35 and older [31]. As the mean age of our study population was 31, these costs are more in line with our results.

As in the other studies [5,26,32], the majority of the costs were attributable to the costs due to productivity loss. From an employer’s perspective, the soft ankle brace might be preferred over ankle tape treatment: the soft brace tends to result in a quicker return to work or school. Patients might have benefit from the comfort and adjustability of the brace in the prevention of absenteeism. In a systematic review of Kemler et al. [33] no evidence for quicker return to work for the ankle brace was found. Further research should focus more specifically on the severity of the ankle sprain and type of work in relation to work absenteeism in the first period of an ankle sprain injury.

In this study, the information about recurrent ALALS and costs were collected by using structured online cost questionnaires. The use of self-reporting methods for recurrent ALALS has been used in previous trials on treatment and prevention of ankle re-sprains [34,35] and is common in economic evaluations alongside clinical trials. With respect to recall of volumes of resources used and out-of-pocket costs, it has been shown that the use of cost-questionnaires can replace cost dairies with a recall period up to 6 months [36]. We therefore feel confident that our economic evaluation is reliable.

Missing costs data were imputed according to the ‘last observation carried forward’ principle. Although multiple imputation is often the favorable technique, we assume that our method did not significantly influence the final results as only 3.9% of our data points was missing.

From a societal perspective, the use of a soft brace in the treatment of ALALS did not lead to additional costs despite of the higher purchasing costs for the ankle brace. These higher brace treatment costs seem to be negated by lower mean non-healthcare costs per patient treated with a soft brace compared to patients with ankle tape treatment. In this study, the costs for the soft ankle brace were regarded as intervention costs. In daily life, the costs of ankle braces are usually not or hardly ever reimbursed by health care insurance companies in the Netherlands. Treatment with a soft ankle brace will increase the direct non-healthcare costs (out of pocket costs for patients). Despite our finding that using the soft brace is associated with lower societal costs, these higher out of pocket costs might be a barrier for the use of ankle braces in treating ankle sprains. Other arguments, such as patient comfort and lifestyle activities may become important in the choice to go for brace or tape.




This study was partially funded by NEA International, manufacturer of the Push Med ankle brace.

Statement of financial disclosure and conflict of interest

The content of this report is solely the responsibility of the authors and does not necessarily represent the official view of NEA International. We declare that we have no conflict of interest. Prof. FJG Backx declares: Nea International has given unrestricted financial support to initiate and perform this study. Furthermore they offered the ankle braces (type Push Med) aimed at the intervention. We fulfilled this study without any influence or interference of the sponsor.


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