Lumbar Spinal Stenosis
What it is
“Stenosis” simply means narrowing. Your spinal canal is the bony tunnel that protects the nerves running down your lower back to your legs. In lumbar spinal stenosis, that tunnel narrows and crowds the nerves. The narrowing usually builds up slowly over years as the spine ages — the cushioning discs flatten, the joints enlarge, and a ligament inside the canal thickens. None of this happens because of anything you did wrong, and it is one of the most common reasons people over 60 see a spine specialist.
What it feels like
The classic pattern is heaviness, aching, burning, or cramping in the buttocks and legs that comes on when you stand or walk, and eases when you sit or lean forward. Many people notice they can walk much farther leaning on a shopping cart, or that they are comfortable on a bicycle but not on their feet. That is because bending forward opens up the narrowed canal and gives the nerves more room. Back pain may or may not be part of the picture; for many people, the leg symptoms are what limit them most.
How we diagnose it
Your story and a focused exam tell me most of what I need to know. An MRI confirms where and how severely the canal is narrowed. One important point: this kind of narrowing shows up on the scans of many people who feel completely fine — so I treat the patient in front of me, not the picture alone. Your symptoms and the scan have to match.
How we treat it
Most people start — and many stay — with non-surgical care:
- Physical therapy to strengthen your core and keep you moving
- Anti-inflammatory medication when appropriate
- An epidural steroid injection, which can calm an irritated nerve and provide real relief
Surgery is an option, not an obligation. The usual operation is a decompression (laminectomy): I remove the bone and ligament crowding the nerves to reopen the tunnel. Whenever I responsibly can, I do this without a fusion, because preserving the natural motion of the level is better for your spine over the long run. A fusion is added when a vertebra has also slipped or the spine is unstable and would become more so once I take pressure off. We make that decision together, based on how much the symptoms limit your life — not on the MRI by itself.
The science — for the curious
Lumbar stenosis is rarely an emergency. Left alone, most people stay about the same or change slowly, with symptoms that wax and wane rather than march steadily downhill. That is why it is reasonable to take your time with non-surgical care. The main reason to consider surgery is quality of life — being able to walk, stand, and do what you want. Decompression reliably relieves leg symptoms and walking limitation; it is less predictable for isolated back pain, which is worth knowing before you decide. When surgery is needed, I favor the least destabilizing operation that solves the problem: a fused level stops moving, which shifts extra load onto its neighbors and can speed their wear, so I avoid adding a fusion unless the spine truly needs it.
Learn more
American Academy of Orthopaedic Surgeons — OrthoInfo: orthoinfo.aaos.org
North American Spine Society — KnowYourBack: knowyourback.org
This handout is general education about a common condition and does not replace the personalized advice we discuss in clinic. If anything here does not match what we talked about, what we talked about wins — please ask me.