Spinal stenosis

What narrows, and why it matters when you stand

Stenosis is narrowing of the space the spinal cord and nerve roots occupy. It develops slowly: disc height is lost, facet joints enlarge with arthritis, and the ligamentum flavum thickens and buckles inward. Each is a normal degenerative change; together they reduce the available canal.

Standing and walking extend the lumbar spine, which further narrows the canal and compresses the vessels supplying the nerve roots. Sitting or leaning forward flexes it, opening the canal again. That is why patients describe leaning on a shopping trolley, or finding that they can cycle for far longer than they can walk.

Distinguishing it from vascular claudication

Poor arterial circulation produces a similar picture, and the two are frequently confused. Vascular claudication is relieved by stopping, regardless of posture, and comes on at a predictable distance. Neurogenic claudication needs the posture change, not just the rest, and varies with the day. We check pulses and, where there is doubt, arrange vascular assessment before treating the spine.

Symptoms

• Heaviness, cramping or burning in both legs after a period of walking or standing
• Relief on sitting, squatting or leaning forward, often within a minute or two
• Progressive reduction in walking distance over months to years
• Numbness or unsteadiness, particularly on uneven ground or in the dark
• In cervical stenosis: clumsy hands, buttons and keys becoming difficult, altered gait

Assessment

We record a baseline walking distance, the single most useful outcome measure in this condition, and examine reflexes, power and sensation. 3D mapping quantifies segmental alignment and how load is distributed; existing MRI is reviewed for the level and severity of narrowing and whether it is central, lateral recess or foraminal, which changes what helps.

Cervical stenosis with signs of cord compression, brisk reflexes, gait disturbance, hand clumsiness, is assessed differently and may warrant surgical referral. We look for this specifically rather than assuming a conservative pathway.

Treatment at Activa

Stenosis cannot be reversed non-surgically; bone that has grown does not un-grow. What can change is how much of the available space is taken up by soft-tissue swelling and how well the patient tolerates the space they have.

Acoustic decompression reduces the paraspinal guarding and improves segmental mechanics, which in many patients meaningfully increases the distance walked before symptoms begin. Epidural steroid injection can reduce inflammatory swelling within the canal, buying a window in which rehabilitation becomes possible. That window is the point an injection alone tends to fade.

Flexion-biased conditioning is the durable part: cycling or recumbent work that trains cardiovascular capacity in a tolerated posture, hip flexor length, trunk endurance, and progressive walking intervals that push the tolerated distance upward week by week.

When decompression surgery is appropriate

Laminectomy or decompression is a reasonable operation where walking distance is severely limited despite proper conservative care, where there is progressive neurological deficit, or where cervical cord compression is demonstrated. We will refer you for that opinion rather than continue treating indefinitely.