Degenerative stenosis of the lumbar spinal canal with compression of neural elements arise as a result of bony, disk, capsular or ligament structures. Depending on localization and spread, they can lead to classic symptoms in the lower extremities. Pain in the back tends to be attributed to secondary degenerative phenomena, e.g. segmental instability or deformity.
There is no clear correlation between the extent of the stenosis shown by imaging and the clinical symptoms. Apart from spinal disk herniations, lateral and central spinal canal stenoses form the most frequent causes.