An endoscopic dural retractor for spinal stenosis surgery.

Area of Science:

• Neurosurgery
• Spinal Surgery
• Minimally Invasive Procedures

Background:

• Lumbar stenosis surgery aims for adequate neural decompression.
• Excessive facet joint removal for decompression can lead to instability.
• Limited visualization of nerve roots is a challenge in current surgical approaches.

Purpose of the Study:

• To introduce a novel endoscopic dural retractor for lumbar stenosis surgery.
• To enhance visualization of the lateral recess anatomy during nerve root decompression.
• To reduce potential instability caused by bone removal during decompression.

Main Methods:

• Design and implementation of an endoscopic dural retractor with a high-resolution endoscope.
• Simultaneous retraction of the dura and visualization of the lateral recess anatomy.
• Endoscopic decompression of ten geriatric cadaver lateral recesses using the developed retractor.

Main Results:

• The endoscopic retractor provided direct lateral visualization of the lateral recess, superior to the operating microscope.
• Nerve root compression by the facet and ligamentum flavum was easily identified.
• Ligamentum flavum was effectively removed, and facet joints were undercut minimally for decompression.

Conclusions:

• The endoscopic dural retractor facilitates precise visualization and decompression of the lateral recess in lumbar stenosis surgery.
• This instrument shows potential for less invasive spinal decompression with reduced risk of instability.
• Further studies are planned to evaluate the clinical utility of this endoscopic retractor.