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Risk Factors for Failure After Lumbar Tubular Microdecompression Without Stabilization.

Ameen Barghi1, Anirudh K Gowd, Edward Beck

  • 1From the Wake Forest University School of Medicine (Glover, Sangio, McKinney, and Barr), and the Department of Orthopaedic Surgery and Rehabilitation, Wake Forest University School of Medicine, Winston-Salem, NC (Barghi, Gowd, Beck, Brown, Bullock, Birkedal, and O'Gara).

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Dynamic spondylolisthesis and facet effusions predict failure after lumbar tubular microdecompression (LTM). Consider stabilization for patients with these findings to improve outcomes and reduce revision surgery rates.

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Area of Science:

  • Spine surgery
  • Minimally invasive spinal procedures
  • Degenerative spinal conditions

Background:

  • Lumbar tubular microdecompression (LTM) is a minimally invasive surgical option for lumbar spine pathology.
  • Stabilization or fusion may be considered but can increase risks and costs.
  • Identifying predictors of LTM failure is crucial for optimizing patient selection and surgical planning.

Purpose of the Study:

  • To identify preoperative radiographic and MRI imaging markers associated with failure after LTM.
  • To determine if specific imaging findings predict the need for revision surgery or additional stabilization.

Main Methods:

  • Retrospective cohort study of 468 patients undergoing LTM for lumbar stenosis (2014-2023).
  • Preoperative imaging reviewed for static/dynamic spondylolisthesis, facet effusions, and synovial cysts.
  • Failure defined as revision LTM, open laminectomy, or fusion for recurrent symptoms.

Main Results:

  • Dynamic spondylolisthesis (OR 1.13, P=0.034) and facet effusions (OR 1.22, P=0.040) significantly predicted increased risk of LTM failure.
  • Static spondylolisthesis and spinal synovial cysts were not associated with failure.
  • Poisson regression controlled for age, sex, BMI, and smoking status.

Conclusions:

  • Preoperative dynamic spondylolisthesis and facet effusions are imaging markers indicating a higher likelihood of failure after LTM.
  • These findings suggest that patients with these imaging characteristics may benefit from the addition of stabilization procedures during LTM.
  • Consideration of stabilization in conjunction with decompression may reduce revision rates and improve long-term outcomes.