Idiopathic scoliosis remains a fascinating and enigmatic disease, and research in the area of spinal deformities involves a broad range of specialties, from etiology to molecular biology and growth regulation. The International Research Society of Spinal Deformities (IRSSD) promotes a multidisciplinary approach to scoliosis and spinal problems, with a strong emphasis on research in the field of etiology, as well as the clinical effectiveness of a wide range of interventions. The society has been active in one form or another for three decades, encouraging open discussion in all areas related to spinal deformities.This book presents the proceedings of the 9th biennial IRSSD meeting, held in Poznan, Poland, in July 2012. It includes peer-reviewed short papers or abstracts summarizing the 129 papers and posters included in the program, and covers all aspects of spinal deformity research, including etiology, genetics, biology, growth, metabolism, biomechanics, imaging technologies, innovations in treatment and treatment outcomes.This current overview of topics related to spinal deformities provides the opportunity for readers to learn more about the latest developments in this field, and it contributes to the advancement of study and research into spinal deformities for the benefit of patients.