Risk Factors for Failure After Lumbar Tubular Microdecompression Without Stabilization

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.