The natural clinical course of lumbar spinal stenosis: a longitudinal cohort study over a minimum of 10Â years

This study showed that clinical symptoms of LSS did not develop in more than 60 % of patients who received conservative treatment, which was dependent on the severity of LSS. In patients with severe LSS and a dural sac cross-sectional area <50 mm2, the clinical course may deteriorate with conservative treatment, and surgery should be considered at an early stage.