At growing ages, the progression of the idiopathic scoliosis with a curve under 25° outlines many features related to the chaos theory. The image of the scoliosis calls to mind the “strange attractors” of the chaotic spine. We describe the 7 main characteristics of the dynamical scoliotic system classified as chaotic. It is an open set system, unpredictable, multi-factorial complex, discontinuous with thresholds that you can model, and it is an inter-phase between childhood and adult time. The chaotic model enables us to understand more the progression of the idiopathic scoliosis. It positively modifies the speech with the patient and its family as well as the therapeutic treatment.