The Neurosurgery Signal — Signal, Not Noise

Rapid review note

Journal Club is a rapid, AI-assisted appraisal layer. It highlights study design, effect estimates, and practice relevance, but it is still a briefing, not a replacement for the paper.

For education only. Not medical advice.

Paper snapshot

Rapid study overview

Open paper

DOI

10.1097/BRS.0b013e31818ed8f4

PMID

19018250

PICO

Population

Surgical candidates with imaging-confirmed lumbar intervertebral disc herniation and symptoms persisting at least six weeks

Intervention

Standard open discectomy

Comparator

Usual non-operative care (active physical therapy, education/counseling, NSAIDs if tolerated)

Outcomes

SF-36 Bodily Pain (BP) and Physical Function (PF) scales, modified Oswestry Disability Index (ODI), work status, patient-reported improvement, satisfaction, sciatica severity

Design

Type

Concurrent prospective randomized and observational cohort study

Randomized

Yes

Multicenter

Yes

Blinded

Not applicable: patients and clinicians not blinded due to surgical vs non-operative nature

Follow-up

4 years with assessments at 6 weeks, 3 months, 6 months, and annually

Primary endpoint

Change from baseline in SF-36 BP, PF, and ODI at 4 years

Secondary endpoints

Patient self-reported improvement
Work status
Satisfaction with symptoms and care
Sciatica severity index

Practice impact

What this means

SPORT 4-year results show surgery for lumbar disc herniation leads to greater improvements in pain, function, and disability compared to non-operative care. However, high crossover from non-operative to surgery (45% in randomized cohort) complicates interpretation. The as-treated analysis demonstrates clinically meaningful benefits of surgery, but work status was similar between groups.

Bottom line

Surgery provides significantly greater improvement in pain, function, and disability than non-operative care at 4 years for lumbar disc herniation patients, but work status similar

Strength of evidence

moderate

Recommendation

consider change

Why it matters

Consistent treatment effects across all primary outcomes with clinically meaningful differences
High crossover in randomized cohort limits strength
Observational data supports surgical benefit in real-world settings

What would change my mind

Randomized trial with minimal crossover and consistent results
Longer-term data showing convergence of outcomes
Subgroup analysis identifying patients who do equally well with non-operative care

Critical appraisal

How strong is the paper?

Methods critique

Risk of bias

High crossover (45% from non-operative to surgery by 4 years in randomized cohort) necessitated as-treated analysis; intent-to-treat underestimated effects

Confounding

Adjusted for baseline predictors of surgery and missing data in longitudinal models; observational cohort had stronger surgery preference and more disability

Missing data

65-87% follow-up rates at intervals; used stepwise logistic regression to identify predictors of missing visits and adjusted in models

Multiplicity

No adjustments for multiple comparisons; p<0.05 threshold for all tests

Notes

Combined randomized and observational cohorts in final analysis
Time-varying covariate in as-treated analysis accounted for variable surgery timing

Stats check

NNT

Not reported

Effect sizes

BP treatment effect 15.0 (95% CI 11.8 to 18.1)
PF treatment effect 14.9 (95% CI 12.0 to 17.8)
ODI treatment effect -13.2 (95% CI -15.6 to -10.9)

Absolute effects

Mean BP change: surgery 45.6 vs non-operative 30.7
Mean PF change: surgery 44.6 vs non-operative 29.7
Mean ODI change: surgery -38.1 vs non-operative -24.9
Working: surgery 84.4% vs non-operative 78.4%

Concerns

High crossover limits randomized comparison validity
No multiplicity adjustment increases type I error risk
As-treated analysis susceptible to confounding despite adjustments

External validity

Who it applies to

Surgical candidates with lumbar disc herniation and radiculopathy >6 weeks at US multidisciplinary spine centers

Who it does not

Patients with acute cauda equina, prior surgery, spinal stenosis, spondylolisthesis, or non-surgical candidates

Generalizability notes

13 centers in 11 states enhances geographic representation
Usual care non-operative protocol allows real-world application
Observational cohort reflects patient preferences in clinical practice

Evidence trace

Source trace and metadata

Citations (3)

claim_id

methods_critique.risk_of_bias

locator

p. 3 Results

quote

In the randomized cohort, 245 were assigned to surgical treatment and 256 to non-operative treatment. Of those randomized to surgery, 57% had surgery by 1 year and 59% by 4 years. In the group randomized to non-operative care, 41% of pat...

claim_id

stats_check.effect_sizes

locator

p. 2 Results

quote

BP (45.6 vs. 30.7; 15.0; 11.8 to 18.1), PF (44.6 vs. 29.7; 14.9; 12.0 to 17.8) and ODI (−38.1 vs. −24.9; −13.2; −15.6 to −10.9)

claim_id

practice_impact.bottom_line

locator

p. 2 Conclusion

quote

patients who underwent surgery for a lumbar disc herniation achieved greater improvement than non-operatively treated patients in all primary and secondary outcomes except work status

Metadata

Generated at

2026-03-06T13:41:29.251Z

Version

top 100 cited in past 20 years