Hyperqueratosis lesions (HL), also known as corns and calluses is one of the most common foot problems. Approximately, 90% of older people exhibit some form of HL, which do not receive early attention, leading to considerable dysfunction related with pain and deformity, foot ulcerate, gait abnormalities, high-risk to falls, overall reduced health-related quality of life. The frequency of impact of HL on the podiatric services is 75% and 84% of people will visit a podiatrist for treatment these problems on the foot.
Also, HL is the result of abnormal mechanical stresses on the skin which stimulate overactivity of the keratinisation process related are numerous etiologies related by mechanical stresses from faulty footgear, changes of the foot morphology, and high levels of activity.
These problems occur more frequently in women and than in men, a wide range of lesion distribution patterns, most can be classified into medial, central, or lateral groups  that often become both permanent and painful.[15,16]
The study of López López et al, with an older people showed that the use of differently sized shoes for each foot may be necessary to prevent the onset of foot conditions and deformities. Based on previous reports of this age group, the aim to study is to discover footwear preferences of older people, pain tolerance may favor presence of HL for the use of inadequate footwear in old age.
2.1 Design and sample
A total of 100 older people participated in the research. This descriptive observational study was carried out in a Clinic of Podiatric Medicine and Surgery that provides treatment of diseases and disorders of the foot at University of Extremadura in the city of Plasencia (Spain) between January and December 2015. A nonrandomized and consecutive sampling method was used to select the 117 participants in the age 65 or over were asked to participate. Two men and 15 women refused arguing personal decision making. Hundred participants gave consent and were recruited. Exclusion criteria: under 65 years of age, autoimmune diseases, previous foot trauma or foot surgery, have a neurodegenerative disorder (for example, Parkinson's disease), be unable to make daily living activities and unable to understand instructions relating to the study and/or carry them out.
At enrollment, patients were interviewed about general health, demographic characteristics (age and sex), and frequency with which they checked their feet. A single trained examiner performed a standardized clinical examination on all participants who first measured height, weight with the subject barefoot and wearing light clothing, and the body mass index (BMI) was calculated from the height (m) and weight (kg2), applying Quetelet equation follow BMI = weight/height2.
In the second place, to determine the examination foot sensitivity using a Semmes–Weinstein 5.07 monofilament nylon wire of 10 g. This test is a reliable and specific for identifying loss of protective sensation in older people (kappa = 0.74; rs = 0.89–0.93).
The instrument was pressed against perpendicular to the foot and with a smooth, steady motion, touched the skin until the monofilament bends the following areas of both feet, dorsal surface of the foot, between the base of the first and second toe, the plantar surface, on the ball of the foot (distal phalanges) of the first, third, and fifth toes, the first, third, and fifth metatarsal heads, the lateral and mid points of the internal and external longitudinal arches, and the heel.[20,21] The positive monofilament score result (insensitivity) was defined if the participant gave a negative response for a minimum of 4 out the 10 pressure points assessed on each foot.[22,23]
Lastly, to determine the severity of shoes using the Tovey criteria, life-size versions of the photographs in the original publication were printed and laminated.
This scale describes a noninvasive method of assessing the severity of shoes as optimal adequate, or dangerous. Optimal footwear was defined lace-up, forgiving materials with at least 3 to 4 eyes on each side, extra width across the metatarsal heads, extra depth in the toe box, low heels, and a padded tangue to firmly hold the foot. Adequate shoes were determined as a cushioned shock-absorbing outsole, flexible uppers, a reasonable toe box, laces, and accommodative features. Dangerous shoes were those with a shallow or narrow toe box, no laces, open toes or heels, and a heel height placing extra pressure on the ball of the foot.
2.3 Ethical considerations
This research was approved by the Research Ethics Committee at the University of A Coruña (Spain), case number CE 10/2015. All participants gave informed written consent before being included, and the ethical standards in human experimentation contained in the World Medical Association Declaration of Helsinki, the Council of Europe Convention on Human Rights and Biomedicine, the UNESCO Universal Declaration on the Human Genome and Human Rights, and those of the relevant national bodies and institutions were observed at all times.
2.4 Statistical analysis
Qualitative variables are shown as absolute values and percentages, while the quantitative variables described are the mean and standard deviation (SD) and maximum and minimum values. The fisher exact test was used to compare categorical variables. Independent t test was used to compare differences between groups. In all of the analyses, statistical significance was established with a P value <.05 with a 95% confidence interval. Statistical analyses were performed using IBM SPSS statistical software (Version 19.0; IBM Corp. Armonk, NY) for Windows.
3.1 Sample characteristics
A total of 100 older people completed all stages of the research process (50 men [50%] and 50 women [50%]). The mean age was 74.90 ± 7.01 years (range 65–89).
Table 1 shows the clinical and sociodemographic characteristics of the informants. As can be seen, most informants are overweight (BMI = 27.86 kg/m2).
A majority of the participants responses to the self-reporting questionnaire revealed that the frequency with which participants carried out foot health checks was relatively low, with only 12% (n = 12) checking their feet every day, versus 34% (n = 34) who check them once a month and 20% (n = 20) who do not typically check their feet. Older people suffering from neuropathy were more willing to perform a once a month foot health check than those who do not have this condition (see Table 2).
Also, older people suffered HL on the feet and a subsequent physical examination revealed that 12% (n = 12) had deformed toes, 61% (n = 61) had HL, and 19% (n = 19) had bunions.
Types of severity of shoes, measured with a Tovey criteria, revealed that 67% of patients were using inadequate footwear. Only 43 participants (43%) used optimal shoes for your feet (Table 3).
The purpose of this study was to discover footwear preferences of those older people, pain tolerance may favor presence of HL for the use of inadequate footwear in old age.
Footwear is essential for the elderly in managing HL, for the maintenance of foot health and mobility and it has long been recognized that suboptimal footwear can be detrimental.[27,28] Although several studies have been undertaken to assess the effectiveness of optimal footwear interventions in elderly, patients with rheumatoid arthritis, individuals with diabetes, foot pain, and other degenerative foot disorder,[17,29–34] none have focused on the relationships footwear preferences and HL.
The study outlined in this protocol is, therefore, novel in that it targets a footwear used by those older people and a history of hyperkeratotic lesions on the foot. In our study, 57% of the participants wearing incorrectly fitting shoes, and 61% presence HL in their feet. Our results are in line with a previous report of Schwarzkopf et al, indicating that proper footwear sizing is lacking among a large proportion of patients and this may be related to a higher number of foot injuries.[33–35]
Also, the majority of elderly who took part in the survey pay little attention to their feet, only 12% (12 of 100) of the total of our participants performed foot health checks daily. Only 16.22% (6 of 37) from the group with neuropathy which suffer HL performed foot health checks daily, and the HL, as a risk factor for foot ulcer, might have been preventable.[17,36] We think that population do not give adequate importance to maintain the foot health by using proper footwear to avoid keratosis lesions as a risk factor to develop further pathology.
One important finding is that very few any people without HL 15.38% (6 of 39) are using the category of dangerous footwear, while 60.65% (37 of 61) are using dangerous footwear category. We think that the presence of HL at toes or any other site of foot should be considered as a risk factor to develop further lesion in a short time for people at risk due to presence of neuropathy or at medium or large time for older people. The presence of HL should advise the people to avoid the use of this kind of shoes and clinicians should be aware patients with HL are using dangerous footwear and it could be promoted some actions, as change the footwear to improve healthy foot health in elderly population.
Also, in light of the results obtained in this study, we have identified that the presence of inadequate footwear is associated with HL equally in both men and women.
There are several limitations to the study that should be acknowledged. First this research excluded people who required custom shoes or custom inserts. Second, a larger and more diverse (individuals from various countries) sample size would be beneficial to improve the strength of the study. Third, expanding data collection to other countries may help to identify if there is a culture where this association does not exist and identify the mechanisms involved.
This highlights the need for further research on the presence and severity of shoes and how it influences on the presence foot disorders in order to improve patient's health, quality of life, and autonomy of senior citizens.
This study offers another proof that older people with HL are associated with inadequate footwear, loss of sensitivity, and low frequency of foot health checks. Therefore, proper care and control of the foot are extremely important to ensure healthy feet in order to prevent the appearance or development of lesions, pain, infections, or deformities along the process of controlling its functionality.
To all patients who had participate in the research.
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