The photo of the patient’s foot, sent from his campsite, included a cheeky note: “I remember you telling me that getting in trouble doing something was better than getting in trouble doing nothing. This lets me get out there and know that I have feedback.”
The “this” was the patient’s “foot selfie,” an approach that allows patients at a risk for diabetic foot ulcers (DFUs) to snap a picture and send it to their healthcare providers for evaluation.
This particular patient had an extensive history of previous wounds. Some had essentially kept him house-bound in the past, as he was afraid to get another one.
This time, however, he got an all-clear to keep on camping, “and we scheduled him in on the following Tuesday [for follow-up],” said the camper’s physician David G. Armstrong, DPM, MD, PhD, professor of surgery and neurological surgery, USC Keck School of Medicine, Los Angeles.
Dr. Armstrong is one of the researchers evaluating the concept of foot selfies. It’s a welcome advance, he and others said, and has been shown to help heal wounds and reverse pre-ulcer lesions. Research on foot selfies continues, but much more is needed to solve the issue of DFUs, diabetic foot infections (DFIs), and the high rates of reinfection, experts know.
Worldwide, about 18.6 million people have a DFU each year, including 1.6 million in the United States. About 50%-60% of ulcers become infected, with 20% of moderate to severe infections requiring amputation of the limb. The 5-year mortality rate for DFUs is 30%, but it climbs to 70% after amputation. While about 40% of ulcers heal within 12 weeks, 42% recur at the 1-year mark, setting up a vicious and costly cycle. Healthcare costs for patients with diabetes and DFUs are five times as high as costs for patients with diabetes but no DFUs. The per capita cost to treat a DFU in America is $17,500.
While the statistics paint a grim picture, progress is being made on several fronts:
- US Food and Drug Administration (FDA) guidance on the development of drugs for DFUs, under evaluation, is forthcoming.
- New treatments are under study.
- A multidisciplinary team approach is known to improve outcomes.
Anatomy of a DFU
When neuropathy develops in those with diabetes, they no longer have what Dr. Armstrong calls the “gift” of pain perception. “They can wear a hole in their foot like you and I wear a hole in our sock or shoe,” he said. “That hole is called a diabetic foot ulcer.”
A DFU is an open wound on the foot, often occurring when bleeding develops beneath a callus and then the callus wears away. Deeper tissues of the foot are then exposed.
About half of the DFUs get infected, hence the FDA guidance, said Dr. Armstrong, who is also founding president of the American Limb Preservation Society, which aims to eliminate preventable amputations within the next generation. Every 20 seconds, Dr. Armstrong said, someone in the world loses a leg due to diabetes.