Infraspinatus muscle hypertrophy and wasting of axillary folds as the important signs in Duchenne muscular dystrophy

Eighty-four patients with Duchenne muscular dystrophy (DMD) were examined clinically for hypertrophy and wasting in different muscles, parts of the muscles or muscle groups. Some muscles were examined under mild contraction to bring out any subclinical pseudohypertrophy. Findings revealed infraspinatus muscle hypertrophy to be significantly frequent (88%) and closely second to well known calf hypertrophy (94%). Infraspinatus hypertrophy was noted in 5 such DMD patients in whom calf hypertrophy was unremarkable. The wasting was consistently observed in the muscles forming anterior and posterior axillary folds. In conclusion, infraspinatus muscle hypertrophy and wasting of axillary folds are the important supportive clinical evidences during the examination of DMD patients.