There's a clinic in Japan run by a Ginza Kojima company. It's a form of non-surgical limb lengthening. According to a biology text book that I own soaking a bone in an acid for a period of time destroys the mineral content of the bone leaving only the collagen fibers. These collagen fibers are incredibly flexible and the bone can be lengthened in this de-mineralized state.
Now there's something to be said about dangerous versus worthless(like so-called height increase pills that are merely vitamin supplements). The Kojima procedure involves bathing the bone in green light(which I believe de-mineralizes the bone enabling it to be stretched) and then stretching the bone. The Kojima website discourages use of heavy weights after undergoing the procedure which is evidence that the Kojima method does in fact de-mineralize the bone.
The procedure works and the site has x-rays to prove it. The site claims that it works by enhancing your growth hormone levels but that makes no sense at all especially since the gains in height are almost instantaneous. The clinic must have found that the bone gains its mineral content back rather quickly. It only takes one four hour session to grow 2 cm. The bone must gain it's mineral back or after that four hours your bones would be like Gumby.
Now I can't speak as to the long term affects of radiation on your bones but we all know the horror stories of radiation poisoning(and Godzilla). Really Kojima's clinic is violating the patient's bill of rights by not giving people informed consent. At least with regular Limb Lengthening Surgery, you know the risks but with Kojima's method you don't know exactly what radiation you are being exposed to and how much.