Dystrophy Affected Muscles Onset Age Duchenne Lower limb, hips, shoulders, cardiac Childhood (early years) Becker Lower limb, hips, shoulders, cardiac 5-15 years of age or adulthood Myotonic Facial, distal extremities Infants to adulthood Limb-girdle Proximal muscles of pelvis and shoulders Late adolescence to adulthood, sometimes childhood Facioscapulohumeral Facial, upper arm, shoulder Early adolescence, sometimes childhood

Table 1: Some Muscular Dystrophies (MDs) along with the muscles involved and the age of onset*. *A comprehensive description of other muscle dystrophies can be found in the following reference [3].