Your browser does not support javascript:   Search for gard hereSearch for news-and-events here.


Genetic and Rare Diseases Information Center (GARD)

Print friendly version

Miyoshi myopathy

Other Names for this Disease
  • Miyoshi distal myopathy
  • MM
  • Muscular dystrophy, distal, late onset, autosomal recessive
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.


Newline Maker

What are the signs and symptoms of Miyoshi myopathy?

The onset of signs and symptoms is typically in mid to late childhood or early-adulthood, with an average age at onset of 19 years. Young adults typically have muscle weakness and atrophy (wasting), most marked in the distal parts of the legs, especially the gastrocnemius (calf) and soleus (Achilles tendon) muscles. Early on, affected individuals are not able to stand on tiptoe, but retain the ability to stand on the heels. Over a period of years, the weakness and atrophy spread to the thighs and gluteal muscles, at which time climbing stairs, standing, and walking become difficult. The forearms may become mildly atrophic with decrease in grip strength; the small muscles of the hands are not affected. The weakness may eventually include the shoulder girdle muscles. The weakness and atrophy may be asymmetric (occurring more on one side than the other). Progression of the condition is typically slow.[1]
Last updated: 4/5/2011

  1. Masashi Aoki. Dysferlinopathy. GeneReviews. April 22, 2010; Accessed 4/4/2011.