The method presented in this book is a minimally invasive operative technique that applies autologous bone plugs with unilateral oblique posterior intervertebral body fusion instead of foreign body fixation. It is a revolutionary technique for a lumbar fusion operation that uses material from the individual patient and therefore has no risk of rejection. Developed by Professor Soo-Young Oh after a long-term study, this alternative technique for lumbar fusion with pelvic bone transplants to the instable lumbar column, unilateral oblique posterior intervertebral body fusion, is also known as 'Ohs fusion', and has been acknowledged by the Swiss Ministry of Health. It is also highly recommended by insurance companies and complies with their '3Es' requirement: economy, efficiency and expediency. In this volume, all physicians, especially neurosurgeons, neurologists, orthopedists, surgeons, as well as public health professionals interested in new surgical developments will find valuable information about this revolutionary technology.