Lower mobile portion of the spine, usually comprising five vertebrae between the thorax and sacrum.
mikeingram1; recoloration : MJL — CC0 1.0. Image source.
Understanding the structure and its role
Lumbar vertebrae are substantial bones that transfer trunk loads to the pelvis. Discs permit small movements that add together; facet joints and muscles guide them. L4–L5 and L5–S1 commonly appear in imaging reports. Below the end of the spinal cord, the canal mainly contains cauda equina nerve roots.
Symptoms and assessment
Low back pain may remain local or accompany leg symptoms. Pain alone, sensory loss and motor weakness have different implications. Hip, gait and neurological examinations help distinguish referred pain, radiculopathy and symptomatic stenosis.
Assessment considers symptom onset, distribution, restricted activities and medical history. Imaging findings must be compared with the clinical examination: a visible abnormality does not, on its own, establish the source of pain.
Management and outlook
Care emphasizes useful movements, graded loading and a realistic plan for recurrent episodes. No single exercise is appropriate for every cause of low back pain.
For a mechanical problem without concerning findings, care aims for a gradual return to activity, individually selected exercises and measurable functional goals. Manual care may complement this approach when the examination supports it. Progress is judged through walking, sleep and daily tasks, as well as symptoms, rather than through an image alone.
When to seek prompt assessment
New or progressive weakness, newly impaired walking, loss of sensation around the saddle region, or new bladder or bowel control problems require urgent medical assessment.
Frequently asked questions
Does L5–S1 name a nerve?
It primarily names the level between two vertebrae; several structures occupy that level.
Does low back pain mean a herniated disc?
No. Low back pain does not automatically identify its source.
Can imaging establish the diagnosis alone?
No. Findings must fit the clinical history and examination before they guide treatment.
Should all activity stop?
Usually not: loading is adjusted and gradually increased according to tolerance and the diagnosis.
How should progress be monitored?
Track functional abilities, neurological symptoms and resumed activities so care can be adjusted.
Concept diagram showing key relationships; this is not a scan or an anatomical drawing to scale.
Role of TAGMED care
At TAGMED, this information helps clarify your history, guide assessment and determine whether conservative care is appropriate or medical referral is needed. An anatomical structure, sign or test result is not, by itself, an indication for decompression, laser, shockwave or manual treatment. Care selection depends on the cause of symptoms and your clinical circumstances.
Medical references
- OpenStax, Rice University. Anatomy and Physiology 2e — The Vertebral Column.
- NIAMS, National Institutes of Health. Back Pain: Diagnosis, Treatment, and Steps to Take.
- American Association of Neurological Surgeons. Cauda Equina Syndrome.
References document the topic; their inclusion does not imply endorsement of TAGMED services by those organizations.
Educational information from The Spine Page. This entry does not replace an individual assessment. Documentary version: October 12, 2026. Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath.
TAGMED clinic contact details
For non-urgent consultations and information about available services.
Clinique TAGMED — Terrebonne
1150, rue Lévis, Suite 200
Terrebonne (Québec) J6W 5S6
450‑704‑4447
Clinique TAGMED — Montréal
1140, avenue Beaumont
Mont-Royal (Québec) H3P 3E5
1‑877‑672‑9060