In the 1860s, descriptions of boys who grew progressively
weaker, lost the ability to walk, and died at an early age became
more prominent in medical journals. In the following ten years,
French neurologist Guillaume Duchenne gave a comprehensive account
of 13 boys with the most common and severe form of the disease
(which now carries his name - Duchenne muscular dystrophy). It soon
became evident that the disease had more than one form, and that
these diseases affected males of all ages.
Nine diseases including Duchenne, Becker, limb girdle,
congenital, facioscapulohumeral, myotonic, oculopharyngeal, distal,
and Emery-Dreifuss are always classified as muscular dystrophy.