Conservative treatment of spine deviations is often prescribed without much enthusiasm or conviction. Many specialists believe that it is a waste of time and money. Encouraged by the results obtained applying the conservative treatment to deviations of the spine, we researched -first in animals (rabbits), later in human beings, both during their growth period- the effects of the conservative, dynamic and instrumentalized treatment: the F.E.D. method. We submit the results obtained with 174 scoliotic patients, of ages ranging 5 and 41, and an average age of 13.4. The average initial Risser was 2.21. Initially, all of them had structured scoliotic curves, with different etiologies, many of them evolutionary, with Cobb angles of between 6 and 66°, and an average Cobb of 23,07°. Vertebral rotation ranged from 2 to 41° (Raimondi). The treatment applied was based on electrotherapy, thermotheraphy (preparatory phase), vertebral traction, use of the F.E.D. unit (with tridimensional fixation of the spine, elongation, derotation and inflexion or inversion of the curves), as well as analytical kinesitherapeutic techniques, hyper and self-corrective kinesthetic consciousness of the orthostatic position, selective for each curve. The results drawn from this study and its analysis, allow us to assure that the therapeutic procedure employed -the F.E.D. method- is effective. The corrections achieved are permanent, it is non-aggressive, well tolerated, and affordable.