Defining clinically relevant values for developmental spinal stenosis: a large-scale magnetic resonance imaging study

Area of Science:

• Radiology and Imaging
• Orthopedic Surgery
• Neurosurgery

Background:

• Developmental spinal stenosis is a key factor in lumbar canal stenosis, but its prevalence and significance are unclear due to inconsistent definitions and lack of ethnic-specific data.
• Standardized magnetic resonance imaging (MRI) criteria are needed to accurately assess lumbar spinal stenosis.

Purpose of the Study:

• To establish clinically relevant relative and critical (absolute) MRI values for lumbar spinal stenosis.
• To compare MRI measurements between surgical cases and asymptomatic controls.

Main Methods:

• A case-control study involving 100 surgical patients and 100 asymptomatic, age- and sex-matched Chinese controls.
• Measurement of spinal stenosis parameters using axial and sagittal MRI views.
• Analysis using receiver operating characteristic curves to define stenosis criteria.

Main Results:

• Patients with lumbar spinal stenosis exhibited significantly narrower anteroposterior canal diameters than controls at all levels.
• Developmental spinal stenosis was defined by specific anteroposterior canal diameter thresholds (e.g., L4 <17 mm).
• Critical stenosis values were identified (e.g., L4 <14 mm), below which surgery was highly likely.

Conclusions:

• This study provides the largest MRI-based criteria for lumbar spinal stenosis with standardized measurements.
• Findings support the role of developmental stenosis in symptomatic spinal stenosis.
• Defined critical values may aid in identifying levels requiring canal-widening surgery.