http://www.sociology.su.se/cgs/Conference/Klein%20and%20Kuli
A must read dissertation...very informative
Silicone Injections - Bad for Ones Health
The use of silicone injections is still in the experimental stages in the United States and there are therefore only a few physicians who are liscenced to practice under some very strict guidelines. The procedure as I have been informed is limited in use and mostly involves injection under wrinkles to mimimize the appearance of lines. Some speculate that it should be tried in other applications, but to my knowledge this had not yet received approval either. The amount of silicone involved in this procedure is incredibly small compared to what would be needed to create some of the intended results in a transsexuals hip area. Some of the major problems with silicones have been mentioned. Silicones are inert, they cannot be eliminated by the body and are migratory (it moves). Medical grade silicone is virtually non-existant. The notion that there are appropriate materials that someone other than a physician could purchase is a falacy. Additionally it is likely that only the physician's liscenensed to practice the experimental procedure would be capably of appropriating the correct materials.
The people that make silicones are well aware that pumping silicones into humans in the manner described in some of these replies is not legal. Therefore, they do not make a product for this purpose. Don't expect that any of the products that you could purchase are even close to being fit for these purposes.