Evaluating the Competency of Your Diabetic Foot Treatment Team: Essential Skill #2: Testing for Diabetic Peripheral Neuropathy in the Feet.

Evaluating the Competency of Your Diabetic Foot Treatment Team: Essential Skill #2: Testing for Diabetic Peripheral Neuropathy in the Feet.

In these discussions, we discuss each of the 7 essential skills that your diabetes treatment team must use in order to help you prevent an amputation related to your diabetes.

Today we will discuss essential skill number two.

2. Test for neuropathy to help determine the risk of ulceration and amputation.

In the simplest of terms, nerves are the wiring system of the body. They carry information from the outer reaches of the body (such as the hands and feet) all the way back to the brain where this information is processed. One thing that wires and nerves have in common is that they both transmit electrical signals. However, it is probably not a surprise that by comparison, electrical wiring system is significantly simpler than a nervous system.

There are a number of processes that happen within the body that can affect the function of nerves. In the diabetic patient in particular, this includes the way the body is using insulin, levels of blood sugar, levels of circulating lipids (or fats in the blood), blood supply to the nerves themselves, and energy metabolism with in the nerve cells that make up an individual nerve.

Although there are many different processes which can damage nerves, high circulating levels of blood sugar are likely the most damaging. In the United States, diabetic peripheral neuropathy (nerve damage in the feet related to high levels of blood sugar) is the most common type of sensory nerve damage.

Although the nervous system is very complex, checking for nerve damage can be remarkably simple. The most reliable test in order to evaluate whether or not a diabetic patient is at risk of developing neuropathic ulceration that might lead to hospitalization or amputation of the leg can be done in only a few minutes and at very low cost. Because of this, it is absolutely inexcusable that a doctor treating a diabetic would not evaluate the function of the nerves in the feet.

In addition to being low cost and simple to perform, there is one test that is the most useful of all exams in determining whether or not a patient is at risk of developing a problem that might lead to a diabetic foot amputation.

This test is called the Semme’s-Weinstein 5.07 monofilament test. In this test, a 5.07 mm diameter monofilament wire is used to apply precisely 10 grams of pressure to the skin of the diabetic foot in order to determine whether or not
the patient has what is known as “protective sensation”.

During this test, the doctor will ask you to close your eyes. He or she will then touch different parts of your feet with this monofilament asking you to say “right” or “left” whenever the doctor touches either of your feet.

If you can feel every area where the doctor touches your feet, you are at low risk of developing a diabetic foot ulceration that might lead to amputation.

If you do have some loss of sensation, the damage is usually at the ends of the longest nerves in the body. The longest nerves of course happen to go from the spinal cord all the way down the legs and out to the end of the toes. Because of this, the damage seems to appear in what doctors call a “stocking glove distribution pattern.” This means that the damage occurs starting the end of the toes and will usually stop in the same area on both feet as if one has rolled socks on to both feet at the same time.

For example, someone may have lost all of the sensation in the toes, but has all of the station present in the ball of the foot. This means that the patient is at risk of having an open sore develop in the toes but less likely in the midfoot or ball of the foot.

Because this can get worse over time, it provides a good baseline to determine if the diabetic foot problems are staying the same or getting worse.

The implications of this test are that if you have lost “protective sensation,” you are at high risk of starting to develop a blister and not being able to feel that there is a problem. The patients that have this sort of nerve damage will oftentimes step on foreign objects such as splinters, thumbtacks, or slivers of glass and never even noticed that anything has happened. It is this type of open sore that can rapidly develop into an infected diabetic ulceration and later lead to a diabetic foot amputations.

There are a number of other tests that can be used to evaluate the function of the nerves in the diabetic foot. Simply touching a specific type of vibrating tuning fork to the feet and ankles can get a great deal of information about early nerve damage that may be present but not yet concerning for the kind of damage that can lead to open sores.

Other screening tests that your doctor might use include checking hot/cold sensation, two-point discrimination, and evaluating light touch sensation. Nerve conduction velocity exams are more invasive tests and should be reserved for those with indications of problems such as tarsal tunnel syndrome.

Even if there is nerve damage, the open sores that result primarily from existing nerve damage are still mostly preventable. It just requires a little extra vigilance on the part of the patient and the doctor.

If there is only one screening test is performed your doctor evaluating your risk of foot problems that could lead to an amputation, it is the SWMF 5.07 test. For this reason, you must make sure that your diabetic foot doctor checks your feet initially to determine your risk of developing the sort of problems.

Only then will you know whether or not you are at imminent risk of and amputation.


Dr. Christopher Segler is an author, inventor and award winning diabetic foot surgeon. After discovering how diabetic leg amputations resulted from inadequate patient education, it became his passion to teach strategies to stop diabetic amputation. You can learn more by requesting your FREE report “No Leg Left To Stand On: The Secrets Insurance Companies Don’t Want You To Know About Diabetic Foot Amputation” at http://www.ineedmyfeet.com.