This study being undertaken by Red de Terapia Cellular and the University Hospital of Salamanca to investigate whether stem cells from the patient's bone marrow can improve outcomes following back surgery. The study involves collecting mesenchymal stem cells from the patient’s bone marrow and expanding these cells in the laboratory. The cells are then transplanted during back surgery. Participation is by invitation only and restricted to patients lumbar intervertebral degenerative disc disease. The trial started in January 2010 and is expected to enrol 15 patients.