i also have muscular dystrophy a more comon type known as facialscapularhumeral distrophy it mainly effects the face arms and legs i have had no difficulty with it what you will need to do however is get relatives tested such as aunts uncles cousins and siblings also yourself. i have the genectics for it and i may be passed over by the crippling effects. i like your son have alwase had trouble keeping up with classmates in physical activity. i have other diffaculties and they dont seem to effect me eather. lets see total i have fshd which i just talked about adhd scoliosis nf (neurofibermatosis) and the posibility of Syringomyelia. if your son has adhd there may be some hope adhd atention deficit hyperactivity disorder if he has it it may somewut compensete for the difficulties he is having.