The diabetic foot constitutes a world scourge in perpetual increase. Contributing factors to its occurrence, such as neuropathy and arteritis, are present in more than 10% in the diagnosis of type 2 diabetes . The annual incidence of foot ulceration is 1% - 4% and its prevalence is 4% - 10%. This suggests that the lifetime risk can range from 15% to 25%  . Ignorance, poor care and lack of resources are situations with risk of frightening complications such as osteitis, gangrene or later amputation . About 80% of non-traumatic amputations of the lower limbs were performed in diabetic subjects  and more than 85% of them were precipitated by an ulcer .
The Marc Sankale Diabetes Center in Dakar is an international benchmark in the management of diabetes mellitus. Foot lesions, account for 2%, are responsible for 28% of amputations and 15% of mortality . An annual evaluation covering 37,173 treatment procedures, Diallo et al.  reported a limb injury in 93.9%, dominated by an ulcer (46.7%), hence the need to register in prevention. The podiatric risk assessment is an accessible tool for preventing injuries and amputation of the foot in diabetic subjects. Its application in diabetic subjects could prevent 50% of amputations . Since 2002, the gradation of podiatric risk has been adopted by the diabetic foot monitoring committee. It is based on the international classification developed by the International Working Group of the Diabetic Foot (IWGDF) . Given the magnitude of the scourge, we therefore undertook this study with the objective of assessing the podiatric risk in diabetic subjects followed at the Marc Sankale Center. The aim was to propose adequate prevention measures.
It was a cross-sectional, descriptive, analytical study, conducted from May 01, 2018 to May 01, 2019 at the Marc Sankale Center at Abass Ndao Hospital. Any type 2 diabetic patients, regardless of gender, age, ethnicity, or religion were included. They were received at the control consultation and regularly followed up. The patients received a full clinical examination, in addition to the assessment of glycemic balance and other cardiovascular risk factors. Patients who met the inclusion criteria were reviewed to complete the explorations. It was a complement to the neurological examination with the use of the monofilament, the biothesiometer and the realization of the Systolic Pressure Index (SPI). The patient was informed of the subject of our study and his consent sought for inclusion. He was also made aware of his diabetes status and the complications he would be exposed to. The data were collected on a pre-established individual questionnaire which was addressed to the objectives of the study, in strict compliance with medical confidentiality. Non-consent, reduced mobility, the existence of another cause of neuropathy was criteria for non-inclusion in the study. For the purposes of the study, the parameters studied were:
- socio-demographic data (age, sex);
- the profile of diabetes mellitus (seniority, ongoing treatment, balance on the basis of fasting blood sugar and glycated hemoglobin, chronic complications), cardiovascular risk factors associated with diabetes (hypertension, dyslipidemia, obesity, sedentary lifestyle, tobacco);
- the main podiatric risk factors: neuropathy, arteriopathy, deformity, history of amputation and ulceration of the foot;
- the associated podiatric risk factors: wearing unsuitable socks, wearing overly tight shoes, barefoot walking, gait disturbances, traumatic pedicure.
At the end of the data recording, a gradation of the risk of foot ulceration was carried out according to the model proposed by the IWGDF .
To determine the size of the sample, this formula: . n = sample size;
z = confidence level according to the normal centered reduced law (for a confidence level of 95%, z = 1.96, for a confidence level of 99%, z = 2.575); p = estimated proportion of the population with the characteristic (when unknown, p = 0.5); d = tolerated margin of error (for example, the actual proportion is to be 5%). The sample size that were calculated from the formula in our study equal 210.
Data entry and analysis was carried out using an electronic database developed with IBM SPSS 24.0 software. For the descriptive part, the data were presented as a percentage for the qualitative variables and as means (with standard deviation) for the quantitative variables. The bivariate analysis was done using Chi-square tests (Pearson and Yates) for the comparison of proportions. The difference was considered statistically significant for a p < 0.05. Variables with more than 10% missing data were not analyzed.
A total of 200 questionnaires out of 210 were usable. The patients consisted of 61 men and 139 women, a sex ratio of 0.43. The mean age of the patients was 58.9 ± 10 years. The average age of diabetes was 6.4 ± 4 years. The average blood sugar was 1.6 ± 0.7 g/l and the glycated hemoglobin (HbA1c) was 8.1% ± 2.6%. Cardiovascular risk factors associated with diabetes were dominated by high blood pressure (44%), dyslipidemia (25%). Menopause was present in 105 women (75.5% of women). The epidemiological, clinical and paraclinical profile of our patients is summarized in Table 1.
Table 1. Epidemiological, clinical and paraclinical profile of our patients.
Clinical neurological exploration with the Semmes-Weinstein monofilament found hypoaesthesia in 120 patients (60%), 23 cases (11.5%) of anesthesia and 07 cases (3.5%) of hyperesthesia. On a biothesiometer, sensory neuropathy was found in 159 cases (79.5%) including 20 patients aged under 50 and in 139 patients aged over 50.
The posterior pedal and tibial pulse were not seen in 31 patients (15.5%). The systolic pressure index (PSI) was less than 0.9 in 53 patients (26.5%) and more than 1.3 in 10 patients (5%). Of the 63 patients (31.5%) with clinical arterial disease, 25 were able to have a lower limb Doppler ultrasound. It confirmed obliterating arterial disease of the lower limbs in all patients. The other foot lesions were dominated by inter-toe intertrigos (5%), followed by cracks (3%) and hyperkeratosis (2%). The deformations were found in 19.5% of the cases. These were claw toes (10%), hallux valgus (5%), gale (4.5%) (see Figure 1 and Figure 2).
Among the main podiatric risk factors, neuropathy was the most represented with 75.5%, followed by arteriopathy (31.5%) and a history of ulceration (24%) (see Table 2). In bi-varied analysis, a statistically significant link was established between neuropathy and HbA1c (p = 0.02). The same was true for arterial disease and factors such as age (p = 0.04), age of diabetes (p = 0.04), and dyslipidemia (p = 0.07). The deformities were associated with age (p = 0.01). Both ulceration and amputation history were associated with diabetes imbalance (p = 0.04, p = 0.05 respectively).
Figure 1. Cracks and hyperkeratosis of the toes.
Figure 2. Claw toes, Hallux valgus.
Table 2. Frequency of the main podiatric risk factors according to the IWGDF.
The distribution of patients by grade according to the IWGDF classification  is summarized in Table 3. Grades 1 and 2 were predominant in 32% and 34% respectively. Women had a higher podiatric risk (p = 0.03). Grade 1 was predominant in patients whose diabetes had progressed for less than 5 years (p = 0.01), while grade 2 was predominant in patients with diabetes aged 5 years or more (p = 0.001). Patients with an HbA1c level > 7% were the most represented in grade 3 (p = 0.02). Table 4 summarizes the correlation of the grade of podiatric risk according to gender, HbA1c and the duration of diabetes.
The factors associated with the risk of ulceration were: wearing unsuitable socks (46%), walking barefoot (42%), gait disturbance (39%), wearing tight shoes (26.5%), traumatic pedicure (3.5%). Among the associated podiatric risk factors, walking barefoot, wearing unsuitable socks and wearing sandals were the most frequently associated with a high podiatric risk.
Table 3. Distribution of patients by podiatric grade.
Table 4. Correlation of podiatric risk according to gender, HbA1c and the duration of diabetes.
We conducted this study on the evaluation of podiatric risk in type 2 diabetic patients over a 12-month period at the Marc Sankale diabetes center in Dakar. It presented limits because the vascular explorations were incomplete. Since patient care is expensive, especially financial difficulties were faced by patients in performing the most common exams.
The predominance of women is known in most African series   . It could be explained by a greater sedentary lifestyle, a risk factor for obesity and therefore the onset of type 2 diabetes. However, our study, like that of Leye A. et al.  did not find a significant correlation between gender and podiatric risk. The average age of our patients was comparable to the literature   and very close to the period of onset of type 2 diabetes . The age-related podiatric risk, found in our series, could be explained by the duration of progression of diabetes. Half of our patients had diabetes which progressed between 0 and 5 years or 52%. This can be explained by the fact that the Marc Sankale center, the national reference in diabetology, is the focal point for most new cases of diabetes. It is after the implementation of a first care plan that patients are redirected to decentralized care structures via a counter referral system. Despite a shorter history of diabetes (0 to 5 years), the complications were not negligible, confirming the progressive and silent nature of diabetes. Our data on the risk of developing arteritis according to the age of diabetes are already known from the literature . Among the cardiovascular risk factors found, hypertension was the most represented (65%) followed by dyslipidemia (25%). The association of type 2 diabetes and cardiovascular risk factors is well established . Their impact on the occurrence of arterial disease via atheroma plaque also remains widely reported. This would explain the high prevalence of arterial disease in our elderly patients at high cardiovascular risk.
With regard to podiatric risk factors, peripheral neuropathy was the most common with 75.5%. This result is higher than that of Traoré et al.  in Mali, Mbaye N.M et al.  and Diallo et al.  in Senegal. These authors reported frequencies of 55.6% and 13.3%, 72.3% respectively. This neuropathy is predominant among the risk factors for foot ulceration  and increased with the poor glycemic balance (p = 0.02) .
The frequency of arterial disease in our series was higher than the 15.5%, 21.6%, 12.8% respectively reported by Traoré et al.  in Mali, Raharinavalona et al.  in Madagascar and Hamonet et al.  in France. Our results can be explained by the systematization of SPI in the research of arteriopathy. The correlation of arterial disease with dyslipidemia and age is thought to be due to loss of vascular elasticity and atherosclerosis. These two parameters also evolve with the age of diabetes . Foot deformities were present in 19.5% of cases. This result is similar to the 20% reported by Raharinavalona et al. . Age was the only factor influencing the occurrence of deformity in our study (p = 0.01). According to the literature, elderly diabetic patients are particularly affected by complications of the foot. In fact, older subjects probably have a longer course of development of diabetes, so would be more at risk of developing complications linked to diabetes . Deformities of the foot accentuate the areas of hyperpressure and conflict in poorly fitted diabetic patients. This is being at the origin of the occurrence of ulceration or even amputation . The history of foot ulceration was 24% in this study. There was a statistically significant link between the glycemic imbalance and a history of foot ulceration (p = 0.04). Four patients (2%) had already had a lower limb amputation. This result is lower than in the African series where the amputation rate hovers around 46.3% to 50% . This low rate is explained by the fact that our evaluation was more targeted at patients in routine consultation.
Prevention of diabetic foot by screening for podiatric risk remains important. Hence the interest in gradation according to the IWGDF which allowed us to identify a foot at risk in 160 out of 200 patients, or 80%. Leye A. et al.  reported a rate of 58.7%. Grade 1 (isolated neuropathy) was present in 32% of our patients. This result is higher than that of Leye A. et al. serie  which found 9.8%. There was a statistically significant link between grade 1 and the duration of diabetes (p = 0.01). The frequency of grade 2 (Neuropathy and Arteriopathy or deformity) at 34% was comparable to data from the series of Raharinavalona et al. . As for grade 3 (history of ulceration and/or amputation) at 14%, its frequency seems intermediate compared to the 17.3% reported by Leye A. et al. . Grade 3 increased with dyslipidemia (p = 0.02). This high risk could be explained by the fact that the majority of our patients had unbalanced diabetes, which was sometimes overlooked for a long time. It is reported in the literature that the poor balance of diabetes increases the podiatric risk. Among the factors associated with podiatric risk, walking barefoot and wearing tight shoes were the most frequent with 46% each. These results are superior to those of Raharinavalona et al.  who found that 35% of their patients walked barefoot and 30% wore tight shoes. This result could be explained by the lack of awareness of the risk and the precarious socio-economic conditions in which our populations live. The latter would increase the risk.
The assessment of podiatric risk according to the gradation of the International Working Group on the Diabetic Foot (IWGDF) allowed us to identify the foot at risk in 80%. There is a statistically significant link between the gradation of podiatric risk, the age of diabetes, poor glycemic control and dyslipidemia, hence the need for systematic, early and annual evaluation in order to avoid late diagnosis. Associated with this is the strengthening of the education of diabetic patients in order to slow down the onset of complications, identify and early prevent feet at risk according to grade.
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