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Loyola Medicine study finds high success rate for diabetic Charcot foot surgery

Loyola Medicine study finds high success rate for diabetic Charcot foot surgery

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Nearly four out of five diabetic patients with severe cases of a disabling condition called Charcot foot were able to walk normally again following surgery, a Loyola Medicine study has found.

The study by orthopaedic surgeons Michael Pinzur, MD, and Adam Schiff, MD, is published in Foot & Ankle International, the official journal of the American Orthopaedic Foot & Ankle Society.

The growing number of diabetics, combined with the obesity epidemic, is increasing the incidence of Charcot foot. The condition typically occurs in diabetics who have neuropathy (nerve damage), which impairs the ability to feel foot pain. Charcot foot usually develops following a minor injury, such as a sprain or stress fracture. Because the patient doesn’t feel the injury, he or she continues to walk, making the injury worse. This can cause a deformity, or malposition of the foot, which eventually can lead to ulcers and infections of the bone.

“Charcot foot is a debilitating condition that is very challenging to treat,” Dr. Pinzur said. “But with the proper surgical treatment, most patients will be able to walk normally again.”

Loyola Medicine has one of the leading programs in the country for treating Charcot foot, also called diabetic foot or Charcot arthropathy. Loyola takes an integrated approach, combining the expertise of orthopaedic surgeons, podiatrists, endocrinologists and other specialists.

Most patients can be treated successfully by immobilizing the foot. But a small percentage of patients, such as those in the Loyola study, develop severe deformities or bone infections.

Traditionally, a successful treatment for a severe case of Charcot foot was defined as clearing up the infection and preventing a foot amputation. The Loyola study used a stricter standard: in addition to resolving the infection and saving the foot, the patient had to be able to walk outside the home with the use of commercially available therapeutic footwear. Using this higher standard, 77.6 percent of the feet had favorable outcomes following surgery.

The study was a retrospective examination of 214 Charcot foot patients who underwent surgery by Dr. Pinzur over a 12-year period. (Nine patients underwent operations on both feet.) Overall, 173 of the 223 feet had good or excellent outcomes. An excellent outcome was defined as being free of ulcers and infections and able to walk outside the home using off-the-shelf therapeutic footwear and custom foot braces. A good outcome was defined as being infection- and ulcer-free and able to walk outside the home with either a custom shoe modification and/or a short ankle-foot brace.

Seven patients died of unrelated causes within a year of surgery and 15 underwent partial- or whole-foot amputations.

Success rates varied according to the type of Charcot foot deformity. Patients with a valgus deformity pattern had the highest success rate (87 percent). The success rate was 70.3 percent among patients with a dislocation pattern deformity and 56.3 percent with a varus deformity pattern.

A common treatment for severe Charcot foot is to put the patient in a cast. But bones can heal in deformed positions. It also is difficult or impossible for obese patients to walk on one leg when the other leg is in a cast. Patients typically have to use wheelchairs for as long as nine months, and after the cast comes off, they must wear a cumbersome leg brace.

However, traditional surgical techniques, in which bones are held in place by internal plates and screws, also are challenging. Bones already weakened by complications of Charcot foot could collapse under the patient’s weight.

Dr. Pinzur employs a technique that secures bones with an external frame, made of stainless steel and aircraft-grade aluminum. The device, called an Ilizarov circular external fixator, contains three rings that surround the foot and lower calf. The rings have stainless-steel pins that extend to the foot and secure the bones after surgery.

Following surgery, the device remains on the patient for 10 to 12 weeks. During that time, patients often are able to walk or at least bear some weight. After the fixation device is removed, the patient wears a walking cast for four to six weeks. The patient then progresses to a removable boot and finally to diabetic shoes.


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