Where does duchenne muscular dystrophy usually appear?

Proximal muscles: Like most muscle diseases the proximal muscles are affected first duchenne is a sex linked congenital muscle disorder affecting boys and usually is symptomatic by the age of two.

Before age 3 years: Boys with Duchennes MD experience weakness in their lower extremities, especially the hip and erector muscles of the thighs, with frequent falling. The appear to have hypertrophy of the calf muscles.