Did You Know Shoes Can Permanently Damage The Nerves In Your Feet?
Buldt, A.K., Menz, H.B. Incorrectly fitted footwear, foot pain and foot disorders: a systematic search and narrative review of the literature. J Foot Ankle Res 11, 43 (2018). https://doi.org/10.1186/s13047-018-0284-z
Correct footwear fitting is acknowledged as being vitally important, as incorrectly fitted footwear has been linked to foot pathology. The aim of this narrative review was to determine the prevalence of incorrectly fitted footwear and to examine the association between incorrectly fitted footwear, foot pain and foot disorders.
A database search of Ovid MEDLINE and CINAHL yielded 1,681 citations for title and abstract review. Eighteen articles were included. Findings were summarised under the categories of (i) children, (ii) adults, (ii) older people, (iii) people with diabetes and (iii) occupation- or activity-specific footwear. Differences in footwear fitting between sexes were also explored.
Between 63 and 72% of participants were wearing shoes that did not accommodate either width or length dimensions of their feet. There was also evidence that incorrect footwear fitting was associated with foot pain and foot disorders such as lesser toe deformity, corns and calluses. Specific participant groups, such as children with Down syndrome and older people and people with diabetes were more likely to wear shoes that were too narrow (between 46 and 81%).
A large proportion of the population wear incorrectly sized footwear, which is associated with foot pain and foot disorders. Greater emphasis should be placed on both footwear fitting education and the provision of an appropriately large selection of shoes that can accommodate the variation in foot morphology among the population, particularly in relation to foot width.
Footwear has been used by humans for approximately 30,000 years . Although originally worn as a protective covering for the foot, modern footwear is designed to fulfil a range of purposes, the accomplishment of which is judged by three criteria: form, function and fit . Form relates to the aesthetic appeal of footwear, while function relates to the ability of footwear to accomplish its intended purpose, eg. to protect the feet of individuals who undertake activities that may present a risk of injury. Finally, fit pertains to how footwear can accommodate the morphology of the foot .
Footwear fitting is acknowledged as being vitally important as in most cases fit governs function . This means that footwear cannot fulfil its intended purpose if it does not fit the foot correctly . Furthermore, it has been suggested that incorrectly fitted footwear is a major contributor to the development of structural foot disorders, such as hallux valgus and lesser toe deformity [4, 5], as well as skin lesions, such as corns and calluses .
Correct footwear fitting is an inherently complex undertaking for two main reasons. Firstly, the footwear industry is currently unable to design and manufacture footwear that can conform to the three-dimensional morphology of all feet in the population [7, 8]. This is because foot morphology is highly variable between individuals, and there is limited variety in the shape of lasts used to construct footwear [9,10,11,12]. Secondly, footwear selection is not purely based on quantitative measurements of footwear shape and size, but may be influenced by qualitative factors [13, 14]. It is therefore probable that a substantial proportion of the population are wearing incorrectly fitted footwear. With this in mind, the aim of this review is to determine the prevalence of incorrectly fitted footwear and to examine the association between incorrectly fitted footwear, foot pain and foot disorders.
An electronic database search was conducted in March 2018, using the online databases Ovid MEDLINE (1946-present) and CINAHL (1980-present). A set of search terms were derived, and to broaden the search, some terms were truncated with wildcard symbols. The following keywords search terms were used: foot OR shoe* OR footwear AND size* OR fit* OR length OR width OR ‘footwear fit*’ OR ‘shoe fit*‘AND pain* OR disorder* OR ‘foot pain’. Results were limited to human studies published in peer-reviewed journals. The electronic database search was supplemented by cross-checking citations and reference lists from relevant published studies.
A single reviewer (AKB) assessed all studies that were yielded from the search by title and abstract. Studies that fulfilled one or both of the following two criteria were included: (i) studies reported the prevalence of participants wearing incorrectly fitted footwear, and (ii) studies reported the association between wearing incorrectly sized footwear and foot pain or foot disorders.
The search strategy yielded 1681 citations. Following title and abstract review, 18 articles were included and a narrative summary of the findings is provided. A summary of all included studies including participant characteristics, method of analysis and main findings are presented in Table 1.
For all included studies, sample sizes ranged from 50 to 440 participants, with the median number of participants being 138. Mean or average age was reported in all but one study . One study recruited only children  and four studies recruited only older participants [17,18,19,20]. Three studies recruited only female participants [21,22,23], while two other studies recruited predominantly male populations, including underground coal miners  and war veterans . Participants with specific medical conditions were recruited in seven studies [15, 16, 25,26,27,28,29], including diabetes [25, 28, 29], diabetic peripheral neuropathy , Down’s syndrome , Alzheimer’s disease  and inflammatory arthritis . Specific ethnic groups were examined in three studies including participants of Japanese , Thai  or Singaporean  ethnicity. Finally, four studies recruited specific populations [24, 25, 30, 31], including war veterans , underground coal miners , rock climbers  and three different population groups from New York City (a foot specialist private practice, an academic diabetic foot and ankle clinic, and a charity centre serving homeless people) .
The majority of included studies were cross-sectional in design [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] and three studies were case-control in design [15, 31, 32]. All except one study reported the method for measuring the foot . The dimensions of the foot were measured during relaxed bipedal stance in all except two studies that measured the foot while the participant was in a seated position [18, 19]. It has been suggested that feet should be measured during standing to account for changes in dimensions due to splaying of the foot after the acceptance of bodyweight . The studies that measured the foot while sitting did not provide a justification for doing so.
All except three studies measured the length of the foot, with most using a manual device, including a measurement stick [18, 25, 29,30,31], Brannock® device [15, 17, 26, 27] or callipers [19, 21, 28]. Two other studies analysed the area of a foot tracing [16, 20], while another measured the dimensions of a 3-dimensional scan taken from a foot mould .
Two studies only measured foot width [22, 23] while 10 studies measured foot width in addition to foot length [16,17,18,19,20, 24, 26,27,28,29], using a variety of manual devices such as a tape measure , Brannock® device [17, 26, 27] or callipers [18, 28, 29]. Four studies measured foot width using measurements from foot tracings [16, 20, 22, 23] while one analysed a 3-dimensional scan of a foot mould .
All except one study measured the shoes brought by participants to the testing session. The only study that did not measure the participants’ shoes asked participants to report their usual shoe size . For all studies, footwear dimensions were measured using the same method as the measurement of the foot. Most studies used a manual device to measure footwear dimensions [15, 17,18,19, 21,22,23, 25,26,27,28,29,30,31]; two used measurements from a tracing of footwear [16, 20], and one study analysed a 3-dimensional mould of the internal dimensions of the shoe .
There were differences in the way that foot and shoe dimensions were compared and footwear fitting assessed. Several studies used a pragmatic approach guided by shoe sizing [15, 18, 19, 25,26,27,28,29, 31, 32]. For example, one study considered a shoe to be incorrectly fitted if it was at least half a British shoe size larger or smaller than the foot . In contrast, other studies considered shoe fitting to be incorrect if measurements such as overall area, length or width differed between footwear and the foot [16, 20,21,22,23,24, 30]. In these cases, even though footwear and the foot may be different dimensions, footwear size may be correct. This is particularly relevant for length, as it has been suggested that appropriately sized footwear should have a space of at least 10–20 mm between the end of the foot and the shoe [33, 34]. In presenting results related to particular participant groups in this review, a distinction will be made between studies that deemed shoes to be incorrectly fitted based on shoe sizing, and studies that measured differences between the dimensions of the foot and the shoe.
Prevalence of incorrectly fitted footwear
Most studies explicitly reported fitting variables such as length or width, or commented on overall footwear fit by reporting only one variable, usually length. However, there were five studies that reported the number of participants that were wearing incorrectly fitted shoes based on more than one variable [15, 18, 26, 27, 29]. Four studies reported that between 63 and 72% of participants were wearing incorrectly fitted shoes based on length and width [18, 29], while one study reported that 68% of participants wore incorrectly fitted shoes based on three measures (length, width and depth) . One study compared total foot and shoe area to determine footwear fit, finding that the total area of the footwear was smaller than total area of the foot in 47% of participants .
Among the studies that provided specific fitting details, the percentage of participants wearing footwear too long for the foot ranged between 14  and 73%  (median 38% ) and too short between 0.6  and 98%  (median 10% ). In terms of width, between 30  and 88%  (median 58% ) of participants wore footwear that were too narrow and one study found that only 1% of participants wore footwear that was too wide . One study examined depth, finding that 31% of participants wore footwear that was too shallow .
Association between footwear fitting, foot pain and foot disorders
The association between incorrectly fitted footwear and foot pain or foot disorders was investigated in eight studies [17, 18, 20, 23, 25, 28, 30, 31], with all but one study  reporting significant associations between incorrectly fitted footwear and some form of foot pain or foot disorder.
There were five studies that reported an association between incorrectly fitted footwear and foot pain or impaired quality of life [17, 18, 23, 28, 30]. These studies reported a strong association between tight footwear and foot pain, with between 84  and 91%  of participants reporting generalised foot pain while shod. However, the characteristics of recruited participants influenced findings. For example, the study that found that 91% of participants described foot pain was conducted on rock climbers, who wear tightly fitted footwear to optimise contact with the climbing wall. There was also evidence that loose footwear was associated with foot pain, with 64% of participants reporting generalised foot pain while shod . Regarding quality of life measures, one study that recruited 65 older people in Spain found those with ill-fitting shoes displayed significantly poorer overall foot health using the Foot Health Status Questionnaire . In terms of specific regions of the lower extremity, one study reported that incorrectly fitted footwear was significantly associated with the presence of pain in the ankle in women .
There were three studies that investigated the association between incorrectly fitted footwear and foot disorders [18, 20, 25]. Among these there was evidence that incorrectly fitted footwear was associated lesser toe deformity in older people  and the presence of corns in older people . Importantly, there was also evidence of a strong association between current foot ulceration and incorrectly fitted shoes in older people with diabetes [18, 25] with participants with current foot ulceration up to 5 times more likely to be wearing incorrectly fitted shoes compared to individuals without foot ulceration .
Footwear fitting in specific populations
Footwear in children
Children’s feet are different to adult feet, both in shape and posture, and are constantly changing as the child grows . In addition, the morphology of children’s feet are more malleable than adult feet . Indeed, footwear has been used to correct pathological skeletal alignment and foot posture among children . Therefore, correct shoe fitting in children is of paramount importance.
Only one article addressed footwear fitting in children (under 18 years old). The study focused on children with Down’s syndrome, who are known to have flatter, shorter feet and are more likely to have hallux valgus compared to children without Down’s syndrome [38, 39]. This study recruited 50 children with all genetic variants of Down’s syndrome (mean age: 10.6, SD 3.9, range 5–18 years) and found that 58% wore footwear that was too narrow for their feet . This indicates that children with Down’s syndrome may be unable to acquire footwear that can accommodate the wider dimensions of the foot associated with the condition.
Footwear in adults
Five studies investigated healthy adults [21,22,23, 31, 32], with three recruiting young female participants [21,22,23]. Only one of the studies that recruited young females assessed footwear length. This study of young Japanese females found that in a sample of 51 students (average age 21 years), 75% were wearing footwear that was longer than their feet . However, the maximum difference was 14 mm, which falls in the range for correctly fitted shoes based on the recommendation of 10–20 mm clearance between the foot and the shoe . In contrast, 22% wore footwear that was shorter than their feet, thus indicating a potential issue with wearing footwear of inadequate length .
The two other studies that recruited young females only considered footwear width, specifically, width in the forefoot [22, 23]. The first study of 356 American women (average age 42, range 20 to 60 years) found that 88% were wearing footwear that was narrower than their feet, with the average discrepancy being 1.2 cm . Among these women, 37% were wearing high heeled shoes, 49% wore flats and 14% wore sneakers. This was followed by a subsequent study by the same authors, using the same methods, that recruited 255 American women (average age 41, range 20–60 years) and found 86% of participants were wearing footwear that was too narrow, with an average discrepancy of 0.88 cm . No information about shoe type was provided in this study. Both studies also reported that those with foot deformities such as hallux valgus displayed a greater discrepancy between footwear and foot width, however no information was provided as to whether this difference was significant [22, 23].
Two further studies recruited both female and male participants using convenience sampling of individuals that regularly attended foot and ankle clinics [31, 32]. These studies recruited participants of similar age (mean ages 44 and 49 years, respectively) and found that between 35 and 56% of individuals were wearing footwear of incorrect length [31, 32]. Only the study by Akhtar et al.  investigated width, and found that 64% of people were wearing footwear that was narrower than their feet.
Footwear in older people
There is evidence to suggest that the feet of older people are broader in the forefoot region and have a flatter medial longitudinal arch compared young people [40, 41]. Furthermore, older individuals with foot pain display a greater number of foot deformities including hallux valgus and clawed lesser toes compared to older people without pain . These differences in foot morphology may pose a problem for fitting, as shoes are designed to have smooth contours, and are not designed to accommodate irregular bony shapes associated with foot deformity .
Three studies assessed footwear fitting in older people, with mean ages ranging between 69 and 80 years [18,19,20]. The literature indicated that footwear width was of particular concern in older people. For example, a study by Menz et al. of 176 older people (mean age 80.1, SD: 6.4, range 62–96 years) found that 78% wore outdoor shoes narrower than their feet . Similarly, a study by Chaiwanichsiri et al. of 213 older Thai people (mean age 68.7, SD 5.4 years) found that 50% of women and 34% of men wore shoes that were too narrow . In both cases, investigators compared width measurements between the widest region of the shoe and the forefoot. However, Chaiwanichsiri et al.  used a higher threshold to define an incorrectly fitted shoe (at least 5 mm difference between the foot and shoe) compared to Menz et al. who reported incorrect fitting if any discrepancy between shoe and foot width was recorded .
Burns et al.  provided additional context in relation to shoe width, finding that 33% of older individuals wore footwear that was the same width as the foot, but was too long, while 15% of individuals wore shoes that were simultaneously too wide and too long. This may indicate that, in order to accommodate a wider forefoot, some older people may be choosing shoes that are too long for their feet .
The majority of studies including older people have assessed the fit of shoes commonly worn outdoors [18,19,20]. However, the fitting of indoor shoes should not be overlooked, such is the relationship between indoor shoes and falls in older people . As was the case with outdoor shoes, indoor shoes are commonly too narrow for the foot. This was confirmed by Menz et al., which found that among a sample of 176 older people, 81% of participants wore indoor footwear that was narrower than their feet . Therefore, along with outdoor footwear it is apparent that indoor footwear is inadequately designed to accommodate the foot width of older people [44, 45].
The literature has suggested two reasons to explain the overall shoe fitting findings related to older people. Firstly, older individuals may be unable to select footwear to accommodate changes in foot morphology. For example, it may be difficult to acquire footwear that can accommodate a wider forefoot while also being appropriately fitted according to foot length . Secondly, older individuals may not be aware of their correct shoe size. Indeed, a survey of 128 older people found that 26% of men and 47% of women had not had footwear size measured over the past 5 years . If this is correct, then it is vital that health professionals ensure that all older patients are aware of their foot dimensions and appropriate footwear size for length and width.
Footwear in people with diabetes
The association between ill-fitting shoes and the development of foot ulceration in people with diabetes is well documented. Prospective studies have found that either ill-fitting footwear alone [48, 49], or minor trauma caused by footwear is the most common precipitating factor in the development of diabetic foot ulcers [50, 51].
Five studies have investigated shoe fitting among participants diagnosed with diabetes, with all using a similar approach to fitting analysis based on footwear sizing [15, 25, 28, 29, 31]. For example, two studies considered footwear fitting to be incorrect if there was half a size difference between the foot and footwear [29, 31] while one study applied a full size benchmark . Other studies deemed footwear size inappropriate if the difference between foot and footwear length was outside a range of 10–15 mm  or greater than 2 mm . All studies recruited similar samples of individuals with diabetes in terms of age (mean age range 55.6 to 67.2 years) however there was a large range of sample sizes (range 43 to 440). Among these studies, between 33  and 82%  of individuals with diabetes were wearing shoes of incorrect length. Of these, between 10  and 43%  were wearing footwear that was too short, while between 23  and 81% (diabetic men only)  wore footwear that was too long.
In terms of shoe width, there was evidence among a sample of 568 diabetic individuals with peripheral neuropathy that the forefoot of most individuals with diabetes is broader than the most common industrial shoe width references used by shoe manufacturers . This was supported by included literature in this review. For example, in a sample of 100 individuals (mean age 62.0 SD 14.9, range 24–89 years), 46% of individuals wore footwear that was too narrow . However, of these participants, 67% wore the correct length footwear, which may indicate that a large proportion of individuals with diabetes may be selecting footwear that is correctly fitted for length, but are not considering, or are not able to acquire, footwear of sufficient width .
There was no evidence that a greater proportion of participants with diabetes wear incorrectly fitted footwear (according to length) compared to matched controls without diabetes [15, 25]. However, there was evidence of an association between incorrectly fitted shoes and the presence of diabetes-related foot lesions. For example, among a cohort of 440 male veterans with diabetes, those with current foot ulceration were 5 times more likely to be wearing incorrectly fitted shoes (at least one full shoe size difference) .
The overall findings suggest that, even though a similar proportion of individuals with and without diabetes wear incorrectly fitting footwear, the consequences of doing so for an individual with diabetes may be greater due to the potential development of diabetic foot ulceration.
Activity- or occupation-specific footwear
Footwear is often designed to fulfil a range of activity or occupational requirements. For instance, shoes may need protective or traction properties in order to allow the individual to safely and effectively carry out a required task . One such is occupation is mining, which requires workers to stand for long periods of time on sometimes uneven, wet or unstable surfaces . It was identified in a study of 208 mining workers that the boots worn by miners (both lace-up boots and gum boots) were significantly narrower than the foot but also significantly longer than the recommended 10–20 mm clearance . These findings could indicate an attempt by miners to select shoes of appropriate width by wearing excessively long shoes. This in turn may contribute to the high prevalence of foot pain reported in this population .
The only study that investigated activity specific footwear indicated that, among 56 rock climbers, all participants wore shoes that were smaller than the foot, with the mean difference being the equivalent of four British shoe sizes . However, despite the reported pain, these shoe-fitting habits were deemed necessary by rock climbing participants to attain enhanced performance by ensuring close contact between the foot and the climbing surface.
Footwear fitting differences between sexes
Women are more likely to suffer foot pain compared to men [54, 55]. Furthermore, females suffer more foot pain while wearing shoes compared to men, most likely due to the narrower toe box of women’s shoes . Of the studies that recruited both women and men, only one compared shoe fitting between sexes. In this study of older individuals, percentage difference between measures of length, width and total area was compared for both outdoor and indoor shoes . In all comparisons, women displayed significantly greater percentage differences compared to men, thus indicating that women were wearing relatively smaller footwear.
Three studies investigated footwear fitting among men and women, but did not carry out significance testing to compare fitting between the two sexes [19, 28, 31]. These studies provide some evidence that a greater proportion of women wear incorrect sized footwear compared to men. For example, one study reported a greater proportion of women wore shoes that were too narrow (difference greater than 5 mm between foot and shoe) compared to men (50% women, 34% men) . However, there is also some evidence that a greater proportion of men were wearing footwear that was too long compared to women. This was evident in a study of older individuals with diabetes, including 227 women and 172 men that found a greater percentage of men were wearing incorrectly fitted shoes (69% men, 48% women) . Of these 31% of men and 13% of women were wearing shoes that were at least 10 mm longer than their feet.
The available evidence indicates that a large proportion of the population (between 63 and 72%) are wearing inappropriately sized footwear based on length and width measurements, and that incorrect footwear fitting is significantly associated with foot pain, poorer overall foot health, corns and calluses in older people and foot ulceration in older people with diabetes. However, a limitation of the literature is that there are variations between studies in the way that footwear fitting is measured and defined. Hence, future work should adopt standardised approaches to assessing footwear fitting.
Of particular interest among the included literature are findings related to specific groups of participants that are more likely to display variations in foot morphology compared to the broader population. These participants include children with Down’s syndrome, older people, or people with diabetes. Fitting according to foot width was a particular concern among these groups with between 46 and 81% of participants wearing footwear that was too narrow. In addition, there is evidence that older people and people with diabetes may select footwear of inappropriate length in order to acquire footwear to accommodate forefoot width.
Overall, the high prevalence of incorrectly fitted footwear suggests that greater emphasis should be placed on footwear fitting education so people are more aware of their foot dimensions and appropriate foot size. Furthermore, footwear manufacturers should provide an appropriately large selection of shoes that can accommodate the variations in foot morphology among the population. In particular, a greater range of widths for each length sizing option should be made available in order to accommodate feet with wider dimensions.
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No funder played any role in the study design, collection, analysis or interpretation of data, writing of the manuscript or decision to submit the manuscript for publication.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
HBM is currently a National Health and Medical Research Council Senior Research Fellow (ID: 1135995).
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AKB is associate editor of the Journal of Foot and Ankle Research. HBM is editor-in-chief of the Journal of Foot and Ankle Research. It is journal policy that editors are removed from the editorial and peer review processes for papers they have co-authored.
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