Frequently Asked Questions - The FOOTSENSE^R Diabetic Foot Screen Test

Why is monofilament used for neuropathy testing?

Horse hair was the original material used to test tactile sensation. With the invention of nylon, Sidney Weinstein developed the Semmes-Weinstein Aesthesiometer, a set of instruments using monofilaments of varying diameters with constant lengths to test for loss of tactile sensation.

Monofilaments produce a characteristic force perpendicular to the surface with which they are in contact. The force can be reproduced each time the monofilament bends after contacting the skin. The standard for detecting loss of tactile or protective sensation on the foot is 10 grams of linear pressure.

The 5.07 monofilament bends at 10 grams of linear pressure. If the patient fails to detect the touch of the monofilament at the bending point, he has lost sensation in that area of the foot.

What does the number 5.07 represent on a monofilament?

The three-digit numbers represent the common log of the characteristic force in grams plus the constant four.

Why should I use the FOOTSENSE^R monofilament to perform neuropathy testing?

The FOOTSENSE^R monofilament is designed to test for loss of protective sensation (peripheral neuropthy), especially on the plantar surface of the foot. It will bend at the standard 10 grams of linear pressure. Patients who can not feel the application of the monofilament at the point it bends have lost their protective sensation. They are at increased risk for developing injuries that may lead to neuropathic ulcers.

Early detection of peripheral neuropathy may permit medical interventions that will prevent ulceration and reduce the risk of limb amputation.

How do I clean the monofilament?

It is critical that testing for protective sensation be conducted only on in-tact skin and in areas where no callus exists. Never test an area with a wound.

Monofilament may be wiped with alcohol or washed with detergent and water.

When do I need to replace the monofilament?

While monofilament is strong and reliable, nicks and cracks can occur over time. If your monofilament develops nicks or cracks, or if it should become bent, it must be replaced.

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