Stenosis is common diagnosis in back pain clinic,Stenosis of the spinal canal is most often caused by a combination of loss of disc space, osteophytes and a hypertrophic ligamentum flavum.

But Not all patients with narrowing develop symptoms and lumbar spinal stenosis therefore refers to a clinical syndrome of lower extremity pain caused by mechanical compression on the neural elements or their blood supply.(Quote from Patent.co.uk)

Zak treated some "stensis"patient with zak acupuncture,most of them got successful results,but their MRI scan still same as used be.so I think that patient's back pain possibly are not due to "Spine channle narrowing". so we also can say that NOT all stenosis will lead to back pain or numbness.

What's your opinion?