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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...

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Updated: Jun 23, 2026

Full-Endoscopic Interlaminar Approach for Decompression of Lateral Recess Stenosis
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Single-Level versus Two-Level Decompression for Adjacent Segment Spinal Stenosis: A Spinal Canal Area Matched

Josh Zhang1, Tomoyuki Asada, Felipe Colon

  • 1Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA.

Spine
|October 16, 2025
PubMed
Summary

For multi-level lumbar stenosis, single- and two-level decompression offer similar outcomes. Two-level decompression may reduce reoperation at the upper adjacent level, though further study is needed.

Keywords:
Adjacent levelLumbar decompressionPropensity score matchReoperationRevision

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Area of Science:

  • Neurosurgery
  • Spinal Surgery
  • Orthopedic Surgery

Background:

  • Surgeons debate single vs. multi-level decompression for multi-level lumbar stenosis.
  • Existing studies show similar outcomes for single- and two-level decompression.
  • No prior studies compared decompression groups considering upper adjacent level stenosis severity.

Purpose of the Study:

  • To compare clinical outcomes of lumbar decompression without fusion.
  • To match canal area between adjacent levels in one-level decompression and the upper level in two-level decompression.
  • To evaluate reoperation rates and patient-reported outcomes.

Main Methods:

  • Retrospective cohort study of 351 patients.
  • Preoperative imaging assessed dural sac cross-sectional area (DSCSA) and spinopelvic parameters.
  • 1:2 propensity score-matched analysis compared groups based on age, sex, comorbidity, and DSCSA.

Main Results:

  • Overall reoperation rates were identical between single- and two-level decompression groups (21.2%).
  • A trend towards higher reoperation at the upper adjacent level was observed in the single-level group (16.7% vs. 3.0%).
  • Both groups showed similar improvements in patient-reported outcome measures (PROMs) and recovery patterns.

Conclusions:

  • Single- and two-level decompression yield comparable clinical outcomes for patients with symptomatic single-level and adjacent radiographic stenosis.
  • Two-level decompression might offer a reduced reoperation rate at the upper adjacent level.
  • The findings suggest a potential benefit of two-level decompression in specific patient populations.