Deformations are due to abnormal intrauterine moulding and
give rise to deformity of structurally normal parts.
Deformations usually involve the musculoskeletal system and
may occur in fetuses with underlying congenital neuromuscular
problems such as spinal muscular atrophy and congenital
myotonic dystrophy. Paralysis in spina bifida also gives rise to
positional deformities of the legs and feet.
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