I can't remember who asked me about this last week, but you can read Weinstein and Ponseti's complete paper on progression in idiopathic scoliosis (in both immature and mature spines), here:
http://www.ejbjs.org/cgi/reprint/65/4/447.pdf
http://www.ejbjs.org/cgi/reprint/65/4/447.pdf
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