1 in 5,000 males, X-linked recessive hereditary condition (1/3 sporadic, from spontaneous mutation). The diagnosis is usually obvious by the fourth year of life and the patient is severely disabled by 10 years of age. Delayed motor development first noticed from 18 months to 4 years of age 50% not walking before 18 months waddling … Continue reading Duchenne Muscular Dystrophy