NINDS Muscular Dystrophy Information Page

What is Muscular Dystrophy?

The muscular dystrophies (MD) are a group of more than 30 genetic diseases characterized by progressive weakness and degeneration of the skeletal muscles that control movement. Some forms of MD are seen in infancy or childhood, while others may not appear until middle age or later. The disorders differ in terms of the distribution and extent of muscle weakness (some forms of MD also affect cardiac muscle), age of onset, rate of progression, and pattern of inheritance.
Duchenne MD is the most common form of MD and primarily affects boys. It is caused by the absence of dystrophin, a protein involved in maintaining the integrity of muscle. Onset is between 3 and 5 years and the disorder progresses rapidly. Most boys are unable to walk by age 12, and later need a respirator to breathe. Girls in these families have a 50 percent chance of inheriting and passing the defective gene to their children. Boys with Becker MD (very similar to but less severe than Duchenne MD) have faulty or not enough dystrophin.
Facioscapulohumeral MD usually begins in the teenage years. It causes progressive weakness in muscles of the face, arms, legs, and around the shoulders and chest. It progresses slowly and can vary in symptoms from mild to disabling.
Myotonic MD is the disorder's most common adult form and is typified by prolonged muscle spasms, cataracts, cardiac abnormalities, and endocrine disturbances. Individuals with myotonic MD have long, thin faces, drooping eyelids, and a swan-like neck.

Is there any treatment?

What is the prognosis?

What research is being done?

• Workshop on Theraputic Approaches for Duchenne Muscular Dystrophy
  Summary of a May 2000 NINDS workshop on Duchenne muscular dystrophy.
• Conference on the Cause and Treatment of Facioscapulohumeral Muscular Dystrophy
  Summary of a conference, "The Cause and Treatment of Facioscapulohumeral Muscular Dystrophy," held May 8-9, 2000.
• Testimony on Muscular Dystrophy, February 27, 2001
  Congressional testimony on muscular dystrophy by Dr. Audrey Penn, Acting Director, NINDS, February 2001.