What causes diabetic foot ulcers?

Updated: Oct 15, 2020
  • Author: Tanzim Khan, DPM; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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Answer

The etiologies of diabetic ulceration include neuropathy, [16] arterial disease, [17] pressure, [6] and foot deformity. [18] Diabetic peripheral neuropathy, present in 60% of diabetic persons and 80% of diabetic persons with foot ulcers, confers the greatest risk of foot ulceration; microvascular disease and suboptimal glycemic control contribute.

A study by Naemi et al indicated that tissue mechanics may be associated with foot ulceration in patients with diabetic neuropathy, with an evaluation of 39 patients finding that the heel pad in nonulcerated feet tended to be stiffer than in ulcerated feet. [19] . These results were further elucidated in another study by Naemi et al, which reported that the risk of diabetic foot ulcer is higher in diabetic neuropathy patients who have greater plantar soft tissue thickness and lower stiffness in the area of the first metatarsal head. The investigators found that adding the mechanical properties of plantar soft tissue (stiffness and thickness) to commonly evaluated clinical parameters improved specificity, sensitivity, prediction accuracy, and prognosis strength by 3%, 14%, 5%, and 1%, respectively. [20]

The anatomy of the foot must be considered in risk calculation. A person with flatfoot is more likely to have disproportionate stress across the foot and may have an increased risk for tissue inflammation in high-stress regions.


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