Central spinal stenosis

The left figure shows a constricted central spinal canal. The x-ray right shows a constricted spinal canal in cross-section.

In a central spinal stenosis, the central spinal canal itself is constricted. The nerves within the spine become compressed, causing specific symptoms such as a restricted ability to walk. After walking a certain distance, which is not always the same, pain is experienced in one or both legs. The patient can walk no further, and typically has to sit bending forward to ease the pain. Cycling in a forward-leaning posture is usually possible without any limitations whatsoever.

Once the diagnosis is clear and therapy is indicated, less severe cases can be alleviated by placing a prosthesis between the spinous processes (the bumpy projections down the spine). This creates more room within the spine, and the pain usually disappears. This procedure can also be carried out on an outpatient basis, and is less drastic.