A 4-year-old boy was seen two weeks ago by his pediatrician because his father was concerned about him being very clumsy lately. The boy also has a hard time running, climbing stairs and he walks on tiptoes. There is a strong family history of muscular dystrophy. They are here today to go over the results of a muscle biopsy and EMG results. A confirmed diagnosis of Duchenne muscular dystrophy was made. The pediatrician wrote a prescription for physical therapy, and leg braces.