Duchenne Muscular Dystrophy shoulders and arms are held back awkwardly when walking belly sticks sway bac out due to weak bell 1. The most common and muscles weak butt (child is poor most severe form of md muscles(hip at sit-ups) straighteners thin, weak 2. X linked recessive→ thighs Knees may bend (especially DMD gene at xp21 back to take front part) weight. poor thick lower balance: Becker MD: similar but milder leg muscles falls (the 'muscle often mutation in the same gene is mostly fat, and not strong awkward clumsy if ki tight heel cord (contracture Weak muscles in child may walk front of leg cause on toes foot dropand tiptoe contractures.Duchenne Muscular Dystrophy 1. The most common and most severe form of MD 2. X linked recessive  DMD gene at Xp21 Becker MD: similar but milder mutation in the same gene