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- See: myopathic disorders:
- Discussion:
 - congenital myopathies are a group of different conditions, w/ variable genetic patterns of inheritance, that lead to muscle weakness in infancy 
      and early childhood;
 - include central core disease, nemaline myopathy, myotubular myopathy, congenital fiber type disproportion, and centronuclear myopathy;
 - children w/ congenital myopathies present as "floppy" babies in whom weakness leads to failure to achieve normal motor milestones;
 - generally they improve with age, but children are never athletically adept, and they may deteriorate and die of respiratory failure

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Current Concepts Review.  The Diagnosis and Orthopaedic Treatment of Inherited Muscular Diseases of Childhood.