Clinical Scorecard: Can patient factors identify who benefits from fusion?

At a Glance

Key Highlights

• At 12 months, adjusted mean ODI scores were 22.3 after decompression alone and 20.0 after decompression with fusion; the difference did not establish a clear advantage for fusion.
• Adjusted risks of subsequent spine surgery within 12 months were 7% after decompression alone and 6% after fusion, with no clear difference.
• Estimated perioperative complication rates were 5% with decompression alone and 9% with fusion; the risk of subsequent surgery for complications was lower after decompression alone.
• Decompression alone was associated with operations about 85 minutes shorter and hospital stays 1.9 days shorter than fusion.
• Prespecified patient characteristics did not clearly modify comparative effectiveness; an exploratory finding in men with BMI of at least 30 kg/m² requires further investigation.

Guideline-Based Recommendations

Diagnosis

Management

• The study found no clear 12-month disability or reoperation advantage from adding fusion to decompression; it does not provide a clinical guideline or treatment recommendation.

Monitoring & Follow-up

• Study outcomes included disability measured by ODI and subsequent spine surgery within 12 months.

Risks

• Residual confounding was possible, particularly from unmeasured differences in vertebral slippage severity.
• ODI outcomes were missing for about 17% of patients at 12 months; sensitivity analyses produced similar findings.
• Follow-up was limited to 12 months, and findings from patients treated in Norway may not generalize to other health care settings.

Patient & Prescribing Data

Adults aged 18 to 80 years with degenerative lumbar spondylolisthesis and back or leg pain lasting at least 3 months; 1,446 underwent decompression alone and 806 underwent decompression with fusion.

The cohort study used target trial emulation and inverse probability weighting. It found no clear comparative advantage for fusion in 12-month disability, pain, quality of life, treatment satisfaction, or subsequent surgery; decompression alone was associated with fewer perioperative complications, shorter operations, and shorter hospital stays.

Clinical Best Practices

• Interpret the exploratory finding among men with BMI of at least 30 kg/m² cautiously; it arose from a post hoc analysis and requires further investigation.
• Consider the study limitations when applying its findings, including possible residual confounding, limited follow-up, and the Norwegian care setting.

Related Resources & Content

• Annals of Internal Medicine study described in the source article