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Diseases & Conditions

Charcot-Marie-Tooth Disease (CMT)

(Also Called 'CMT (Charcot-Marie-Tooth Disorder)', 'Hereditary Sensory Motor Neuropathy')

What is Charcot-Marie-Tooth Disease?

Charcot-Marie-Tooth disease (CMT) is one of the most common inherited neurological disorders, affecting approximately 1 in 2,500 people in the United States. CMT, also known as hereditary motor and sensory neuropathy (HMSN) or peroneal muscular atrophy, comprises a group of disorders caused by mutations in genes that affect the normal function of the peripheral nerves. The peripheral nerves lie outside the brain and spinal cord and supply the muscles and sensory organs in the limbs. A typical feature includes weakness of the foot and lower leg muscles, which may result in foot drop and a high-stepped gait with frequent tripping or falls. Foot deformities, such as high arches and hammertoes (a condition in which the middle joint of a toe bends upwards), are also characteristic due to weakness of the small muscles in the feet. In addition, the lower legs may take on an "inverted champagne bottle" appearance due to the loss of muscle bulk. Later in the disease, weakness and muscle atrophy may occur in the hands, resulting in difficulty with fine motor skills. Some patients experience pain, which can range from mild to severe.

Is there any treatment?

There is no cure for CMT, but physical therapy, occupational therapy, braces and other orthopedic devices, and orthopedic surgery can help patients cope with the disabling symptoms of the disease. In addition, pain-killing drugs can be prescribed for patients who have severe pain.

What is the prognosis?

Onset of symptoms of CMT is most often in adolescence or early adulthood, however presentation may be delayed until mid-adulthood. Progression of symptoms is very gradual. The degeneration of motor nerves results in muscle weakness and atrophy in the extremities (arms, legs, hands, or feet), and the degeneration of sensory nerves results in a reduced ability to feel heat, cold, and pain. There are many forms of CMT disease. The severity of symptoms is quite variable in different patients and some people may never realize they have the disorder. CMT is not fatal and people with most forms of CMT have a normal life expectancy.

What research is being done?

The National Institute of Neurological Disorders and Stroke (NINDS) conducts CMT research in its laboratories at the National Institutes of Health (NIH) and also supports CMT research through grants to major medical institutions across the country. Ongoing research includes efforts to identify more of the mutant genes and proteins that cause the various disease subtypes. This research includes studies in the laboratory to discover the mechanisms of nerve degeneration and muscle atrophy, and clinical studies to find therapies to slow down or even reverse nerve degeneration and muscle atrophy.

Organizations

Charcot-Marie-Tooth Association (CMTA)
2700 Chestnut Parkway
Chester, PA 19013-4867
info@charcot-marie-tooth.org
www.charcot-marie-tooth.org
Tel: 610.499.9264 800.606.CMTA (2682)
Fax: 610.499.9267

Muscular Dystrophy Association
3300 East Sunrise Dr
Tucson, AZ 85718-3208
mda@mdausa.org
www.mda.org
Tel: 520.529.2000 800.572.1717
Fax: 520.529.5300

Neuropathy Association
60 East 42nd Street, Suite 942
New York, NY 10165-0999
info@neuropathy.org
www.neuropathy.org
Tel: 888.PN.FACTS (888.763.2287)
Fax: 212.692.0668

Hereditary Neuropathy Foundation, Inc
1751 2nd Avenue, Suite 103
New York, NY 10128
info@hnf-cure.org
www.hnf-cure.org
Tel: 877.463.1287 212.722.8396

Source: National Institutes of Health; National Institute of Neurological Disorders and Stroke

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This information is provided by the Cleveland Clinic and is not intended to replace the medical advice of your doctor or health care provider. Please consult your health care provider for advice about a specific medical condition. This document was last reviewed on: 2/15/2011...#6009

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