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Match the research to the question

The first useful question is “Does this study resemble my clinical situation?” Lower-back pain alone, lumbar leg pain, one-sided cervical arm pain and spinal-cord dysfunction are different research populations. A technique comparison among people already selected for surgery cannot decide whether another person needs an operation.

Guidelines combine evidence and judgment; consensus recommendations are not randomized trials. The joint lumbar nomenclature document standardizes words on imaging and does not prescribe treatment.1 NICE NG59 addresses low-back pain and sciatica; NG127 addresses recognition and referral.23 The WFNS 2024 papers are evidence reviews with expert consensus on lumbar conservative care, primary surgery and recurrence.456

StudyWho and whatWhat limits interpretation
SPORT, eight yearsLumbar disc herniation with leg pain; discectomy vs usual non-surgical careMany patients switched groups; randomized and as-treated analyses differ
PTED, 2022Endoscopic lumbar discectomy vs open microdiscectomyLeg pain at 12 months; early learning cases excluded from the main analysis
FACET, two yearsSingle-level cervical radiculopathy; posterior foraminotomy vs ACDFExcludes myelopathy
Mobi-C, ten yearsA cervical disc replacement vs ACDF at three centersSelected one- and two-level disease; losses to follow-up
AAN injection review, 2025Epidural steroid injection trials in radiculopathy and stenosisMostly lumbar; lasting pain relief and rare harms uncertain

Comparisons need their analysis labels

SPORT's randomized assigned-treatment analysis did not find a significant difference in its main pain/function outcomes; adjusted as-treated analyses pooling randomized and observational patients favored surgery. Substantial crossover complicates both interpretations, and the latter retains possible confounding. Improvement in pain or disability is not the same outcome as employment.7

PTED met a five-point noninferiority margin on a 0–100 leg-pain scale at twelve months. The main analysis omitted 125 PTED learning cases; sensitivity analyses included them. Small favorable differences were not necessarily clinically important, and this is not a verdict on every endoscopic method.8

FACET used a 10% noninferiority margin for its primary success/arm-pain questions. It supports posterior foraminotomy as an option in its selected single-level radiculopathy population, with complications and reoperations in both groups. It does not evaluate all cord disease or replacement.9 The primary Mobi-C continuation reported favorable comparative outcomes in selected patients, but a particular device and follow-up subset cannot guarantee protection from adjacent-level disease.10

Cord disease and injections need separate readings

The 2017 AO Spine/CSRS guideline separates clinical myelopathy severity from imaging compression without myelopathy.11 The 2025 and 2026 AO Spine publications critically review selected literature and offer clinical recommendations, including conditional judgments; they are not new universal replacement guidelines. The 2026 review does not support routinely using MRI parameters alone to predict deterioration or time surgery in mild disease.1213

The AAN review found probable short-term radiculopathy pain/disability benefits from epidural steroids, with predominantly lumbar evidence. Evidence for long-term pain relief is insufficient. Its safety discussion includes rare serious neurological injury; pooled benefit estimates do not provide an individual's risk.14

Sacrolumbar interbody fusion (SLIF)

Dr. Kamran Aghayev, who edits Disc Herniation Wiki, and colleagues published a 2024 study of sacrolumbar interbody fusion, a technique for fusing the L5–S1 level. It combined three cadaver spines, computer modeling and eight patients with varied L5–S1 conditions, including previous surgery. The patients' clinical scores improved, none had new neurological deficits, and CT showed fusion at six months. The clinical series had no comparison group, and fusion is not a routine treatment for a first disc herniation515.

References

  1. Fardon DF et al. Lumbar disc nomenclature: version 2.0. Spine J. 2014;14:2525–2545. DOI ↩
  2. NICE. NG59: Low back pain and sciatica in over 16s. Recommendations (updated 2020). Source ↩
  3. NICE. NG127: Suspected neurological conditions. Adult recommendations 1.7 and 1.10. Source ↩
  4. Yaman O et al. Conservative treatment in lumbar disc herniations: WFNS recommendations. World Neurosurg X. 2024;22:100277. Source ↩
  5. Costa F et al. Role of surgery in primary lumbar disk herniation: WFNS recommendations. World Neurosurg X. 2024;22:100276. Source ↩
  6. Zileli M et al. Lumbar disc herniation: prevention and treatment of recurrence. WFNS recommendations. World Neurosurg X. 2024;22:100275. Source ↩
  7. Lurie JD et al. Eight-year SPORT results for lumbar disc herniation. Spine. 2014;39:3–16. Source ↩
  8. Gadjradj PS et al. PTED versus open microdiscectomy: randomized non-inferiority trial. BMJ. 2022;376:e065846. Source ↩
  9. Simões de Souza NF et al. Two-year FACET randomized noninferiority study. J Bone Joint Surg Am. 2024;106:1653–1663. PubMed ↩
  10. Nunley PD et al. Mobi-C versus ACDF at 10 years: randomized trial continuation at 3 sites. Int J Spine Surg. 2023;17:230–240. DOI ↩
  11. Fehlings MG et al. AO Spine/CSRS DCM guideline. Global Spine J. 2017;7(Suppl):70S–83S. Source ↩
  12. Fehlings MG et al. AO Spine DCM critical review and recommendations. Global Spine J. 2025. doi:10.1177/21925682251331050. Source ↩
  13. Neal CJ et al. Mild DCM: contemporary concepts. Global Spine J. 2026 (online September 24). doi:10.1177/21925682261492222. PubMed ↩
  14. Armon C et al. AAN epidural steroid systematic review summary. Neurology. 2025;104:e213361. Source ↩
  15. Aghayev K et al. Sacrolumbar interbody fusion (SLIF). Spine Surg Relat Res. 2024;8:448–457. Source ↩