Taiwan Chang Gung University College of Medicine has done a research about "Adult degenerative scoliosis treated by acupuncture"

They found that Acupuncture was associated with a reduction in the degree of curvature in this case, after 2 years of conventional medical treatment had failed to stop the backache and curvature progression. This suggests that acupuncture not only plays an important role in pain control, but can also improve curvature progression for certain patients with degenerative scoliosis.
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Reference:J Altern Complement Med. 2009 Aug;15(8):935-7.