How can you cure a severe case of scoliosis without surgery?

You don't: Severe scoliosis, more than 40 degrees, is best treated surgically, and that's coming from a non-surgeon. However, there is the schroth method which is a form of spinal stabilization and postural restraining. Some of my patients have benefitted from it, but their scoliosis was less than 35 degrees. There haven't been any good studies showing benefit of chiropractic treatmer.