Intraoperative neuromonitoring during surgery for lumbar stenosis

Area of Science:

• Neurosurgery
• Spinal Surgery
• Neuromonitoring

Background:

• Lumbar stenosis surgery involves risks from patient positioning, surgical approach, neural decompression, and instrumentation.
• Co-morbidities like obesity and diabetes increase risks for positioning-related neuropathies (e.g., brachial plexopathy, femoral neuropathy).

Purpose of the Study:

• To define the indications and optimal modalities for neuromonitoring in lumbar stenosis surgery.
• To evaluate the current literature regarding the efficacy of various neuromonitoring techniques.

Main Methods:

• Review of literature on neuromonitoring in lumbar stenosis surgery.
• Analysis of risks associated with patient positioning, surgical techniques, and instrumentation.
• Evaluation of different neuromonitoring modalities including EMG, SEP, MEP, and bulbocavernosus reflex.

Main Results:

• Routine use of EMG and SEP alone is not supported; lateral approach neuromonitoring with EMG only is questionable.
• Advanced neuromonitoring (EMG, SEP, MEP) is often necessary for deformity correction.
• The bulbocavernosus reflex can assess conus medullaris and cauda equina function.
• Pedicle screw threshold monitoring recommendations are evolving with advanced surgical technologies.

Conclusions:

• Neuromonitoring indications in lumbar stenosis surgery are multifactorial, depending on surgical complexity and patient-specific risks.
• Advanced neuromonitoring modalities are crucial for complex procedures like deformity correction.
• Further prospective cohort trials are needed to strengthen evidence beyond uncontrolled case series.