Treatment of the common condition lumbar stenosis (narrowing of the spinal canal in the lumbar region) needs to be handled better. With this aim in mind, Schulthess Klinik, Balgrist University Hospital and University Hospital Zurich have been conducting joint research for nine years now. The results from over 850 patients have appeared in over 20 studies up to the present day, with the aim of providing patients affected with optimal, knowledge-based and individual treatment.