Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.
2 min synopsisUK scopeSources checked 13 Sept 2026Clinical review pending
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Compression or construct failure
Rapid neurological decline, cauda-equina symptoms, severe new mechanical pain, deformity, wound sepsis or postoperative deficit may reflect urgent neural compression or instability.
Action: Protect alignment where instability is possible, document neurology, obtain urgent cause-matched MRI and CT as needed, and involve spinal surgery immediately rather than debating elective fusion terminology.
Synopsis
Explain what spinal decompression and fusion each accomplish, recognise when instability changes the operation, and avoid treating instrumentation as the default response to degeneration.
Decompression removes pressure from neural structures; fusion aims to stop pathological movement and achieve a solid bridge between vertebrae. They solve related but different problems.
The worked case preserves clinical target, instability assessment, operative choice and postoperative verification in Rapid mode.
For lumbar stenosis with predominant leg symptoms and no instability, WFNS recommends decompression alone; stable spondylolisthesis does not automatically require fusion.
Key red flags
New motor loss, gait failure, saddle or bladder symptoms indicates threatened cord or cauda and requires emergency assessment independent of planned elective surgery.
Acute severe pain with deformity, translation, fracture, implant breakage or destructive infection or tumour suggests mechanical instability.
Postoperative weakness, wound swelling, fever, clear drainage or escalating radicular pain can indicate haematoma, infection, CSF leak, malposition or residual compression.
Progressive junctional deformity or loss of balance after long fusion can impair neurology or horizontal gaze and warrants specialist review.
Postoperative emergency
New deficit, sphincter dysfunction, fever, wound drainage or rapidly escalating pain after surgery needs urgent imaging and operative-team review.
Reasoning priorities
01
MRI for neural compression
Define stenosis, disc, ligament, cord or root compromise and select the minimum adequate decompression.
The level and side must match symptoms; incidental multilevel degeneration does not require multilevel surgery.
Worked reasoning
Worked caseLeg-dominant stenosis without instability
An adult has disabling neurogenic claudication, concordant lumbar stenosis and failed meaningful non-operative care but stable alignment.
Context: confirm leg-dominant exertional symptoms, exclude vascular and hip disease, document neurology and function, and show concordant stenosis without dynamic or clinical instability.
Reasoning: identify neural compression as the treatment target and absence of a separate mechanical target; WFNS therefore supports decompression alone rather than routine fusion.
Outcome: select the least destabilising adequate decompression, counsel on dural tear, infection, recurrent stenosis and incomplete recovery, and preserve facets where feasible.
Verification: monitor neurological function, walking and wound; compare outcomes with the preoperative goal and investigate new mechanical pain or deficit rather than assuming fusion was omitted incorrectly.
Decompression aloneStable stenosis or isolated disc
Symptoms arise from concordant neural compression and there is no symptomatic instability or reconstructive requirement.
National guidance is shown before implementation-dependent detail. Apply principles in context and verify current guidance when a decision affects care. Source check completed 13 Sept 2026; clinical approval remains outstanding.
WFNS fusion surgery for lumbar spinal stenosis recommendationsSharif et al., World Neurosurgery X 2020; evidence review and consensus statements read 13 September 2026. Decompression alone is recommended for predominant leg symptoms without instability; stable spondylolisthesis does not mandate fusion, while symptomatic unstable spondylolisthesis may require it. Chapter-specific use: spinal fusion and decompression concepts.
WFNS decompressive surgery for lumbar spinal stenosis recommendationsCosta et al., World Neurosurgery X 2020; evidence review and consensus on decompression, outcomes and complications read 13 September 2026. Applies to degenerative lumbar stenosis after failed conservative care; it does not determine management of tumour, infection, trauma or childhood deformity. Chapter-specific use: spinal fusion and decompression concepts.
WFNS lumbar disc herniation surgery recommendationsWFNS Spine Committee systematic review and Delphi guidance, World Neurosurgery X 2024; indications, timing, technique and fusion sections read 13 September 2026. Surgery is individualised for CES, progressive neurological impairment or severe motor deficit; fusion is not routine for isolated first-time disc radiculopathy. Chapter-specific use: spinal fusion and decompression concepts.
NICE NG59 low back pain and sciaticaNICE NG59, published 30 November 2016 and updated 11 December 2020; scope, self-management, exercise, medicines, imaging and spinal surgery recommendations read 13 September 2026. Covers people aged 16 and over with routine low back pain or sciatica and explicitly excludes progressive neurological deficit and cauda equina syndrome. Chapter-specific use: spinal fusion and decompression concepts.