Scoliosis Causes

In most cases (85%), the cause of scoliosis is unknown (what doctors call idiopathic). The other 15% of cases fall into two groups:

• Nonstructural (functional): This type of scoliosis is a temporary condition when the spine is otherwise normal. The curvature occurs as the result of another problem. Examples include one leg being shorter than another from muscle spasms or from appendicitis.
  
  
• Structural: In this type of scoliosis, the spine is not normal. The curvature is caused by another disease process such as a birth defect, muscular dystrophy, metabolic diseases, connective tissue disorders, or Marfan syndrome.