The biomechanical etiology of the so-called idiopathic scoliosis [adolescent idiopathic scoliosis (AIS)] was the subject of research of author from 1984 to 2018. The basic observation comes from the years 1995 – 2007. In presented article is explained the biomechanical etiology of the so-called idiopathic scoliosis, is giving new classification and rules of causal prophylaxis and new treatment. Third group of spine deformity is also the subject for research and therapy for internists, gynecologists, neurologists and other specialists of medicine.
Keywords: Scoliosis. Symptoms. Stiffness of spine. Therapy.