Charcot-Marie-Tooth disease
Definition
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.
Alternative Names
Progressive neuropathic (peroneal) muscular atrophy; Hereditary peroneal nerve dysfunction; Neuropathy - peroneal (hereditary); Hereditary motor and sensory neuropathy
Causes
Charcot-Marie-Tooth is one of the most common nerve-related disorders passed down through families (inherited). Changes to any of at least 40 genes can cause different forms of this disease.
The disease leads to damage or destruction to the covering (myelin sheath) around nerve fibers.
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 most often begin between mid-childhood and early adulthood. They may include:
- Foot deformity (very high arch to feet)
- Foot drop (inability to point foot upward to hold it 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
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
Contact 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.
References
Katirji B. Disorders of the peripheral nerves. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 106.
Sarnat HB. Hereditary motor-sensory neuropathies. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 631.
Reviewed By: Anna C. Edens Hurst, MD, MS, Associate Professor in Medical Genetics, The University of Alabama at Birmingham, Birmingham, AL. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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