Charcot-Marie-Tooth disease

Charcot-Marie-Tooth disease is a group of disorders passed down through families that affect the nerves outside the brain and spine. These are called the peripheral nerves.

Causes

Charcot-Marie-Tooth is one of the most common nerve-related disorders passed down through families (inherited). Changes to at least 40 genes cause different forms of this disease.

The disease leads to damage or destruction to the covering ( myelin sheath) around nerve fibers.

Myelin

Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty ...

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Symptoms

Nerves that stimulate movement (called the motor nerves) are most severely affected. The nerves in the legs are affected first and most severely.

Symptoms usually begin between mid-childhood and early adulthood. They may include:

• Foot deformity (very high arch to feet)
• Foot drop (inability to hold foot horizontal)
• Loss of lower leg muscle, which leads to skinny calves
• Numbness in the foot or leg
• "Slapping" gait (feet hit the floor hard when walking)
• Weakness of the hips, legs, or feet

  Weakness

  Weakness is reduced strength in one or more muscles.

   

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Later, similar symptoms may appear in the arms and hands. These may include a claw-like hand.

Exams and Tests

A physical exam may show:

• Difficulty lifting up the foot and making toe-out movements (foot drop)
• Lack of stretch reflexes in the legs
• Loss of muscle control and atrophy (shrinking of the muscles) in the foot or leg
• Thickened nerve bundles under the skin of the legs

Nerve conduction tests are often done to identify different forms of the disorder. A nerve biopsy may confirm the diagnosis.

Genetic testing is also available for most forms of the disease.

Treatment

There is no known cure. Orthopedic surgery or equipment (such as braces or orthopedic shoes) may make it easier to walk.

Physical and occupational therapy may help maintain muscle strength and improve independent functioning.

Outlook (Prognosis)

Charcot-Marie-Tooth disease slowly gets worse. Some parts of the body may become numb, and pain can range from mild to severe. Eventually the disease may cause disability.

Possible Complications

Complications may include:

• Progressive inability to walk
• Progressive weakness
• Injury to areas of the body that have decreased sensation

When to Contact a Medical Professional

Call your health care provider if there is ongoing weakness or decreased sensation in the feet or legs.

Prevention

Genetic counseling and testing is advised if there is a strong family history of the disorder.