Side portion of the spinal canal through which a nerve root travels before exiting through a foramen.
OpenStax College — CC BY 3.0. Image source.
Understanding the structure and its role
The lateral recess is particularly important when interpreting lumbar MRI. It lies at the side of the canal, before the foramen. A root descends through it before exiting farther down. This explains why an abnormality at one disc level may affect a different root depending on its central, subarticular or foraminal position.
Symptoms and assessment
A posterolateral herniation or facet changes can reduce this space. For example, at L4–L5, recess involvement may affect the traversing L5 root, while the foramen at that level more often involves the exiting L4 root. Examination checks the match rather than treating this example as an absolute rule.
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
Treatment decisions depend on whether radiculopathy is present, its severity and its course. An isolated subarticular description does not automatically indicate traction, injection or surgery.
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 subarticular refer to this region?
Yes. In many lumbar reports, the terms describe overlapping locations.
Why can the nerve number differ from the disc level?
Roots descend before exiting, so lesion location and root pathway must be distinguished.
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
- NASS / ASSR / ASNR; The Spine Journal. Lumbar disc nomenclature: version 2.0 (Fardon et al., 2014).
- NIAMS, National Institutes of Health. Spinal Stenosis.
- American Association of Neurological Surgeons. Herniated Disc.
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