Redefining lumbar spinal stenosis as a developmental syndrome: does age matter?

Area of Science:

• Spine surgery
• Radiology
• Orthopedics

Background:

• Lumbar spinal stenosis (LSS) is often associated with age, with subtypes categorized as degenerative or developmental.
• Previous research has explored radiological differences between developmental and degenerative LSS using MRI.
• The correlation between age, degeneration variables, and spinal canal morphometrics in LSS has been a subject of investigation.

Purpose of the Study:

• To re-analyze existing MRI data from 709 LSS patients to further investigate the relationship between age and degenerative changes.
• To stratify patients into three equal age groups to better understand age-related variations in LSS.
• To determine the extent to which age explains the variance in degenerative pathology and spinal canal dimensions in LSS.

Main Methods:

• Re-analysis of a prospective MRI-based study involving 709 patients with LSS.
• Stratification of patient data into three equal age categories.
• Multivariate analysis of relative spinal canal dimensions and radiological degenerative variables (L1-S1), including total degenerative scale score (TDSS), disc degeneration, and facet degeneration.
• Correlation analysis using Pearson's product-moment correlation and multiple regression.

Main Results:

• Multivariate analysis showed significant differences in TDSS and spinal canal dimensions across age groups, particularly at L2-3 and L3-4.
• Age explained a limited percentage of the variance in TDSS (7.8%-12.2% in upper segments, 1.2%-1.9% in lower segments).
• Age explained a higher but still moderate variance in lumbar intervertebral disc (LID) degeneration (up to 26%) and minimal variance in facet degeneration (up to 4%).

Conclusions:

• Age at presentation demonstrated a weak correlation with degenerative variables and spinal canal morphometrics in LSS segments.
• Degeneration correlated more strongly with age in upper lumbar segments (L1-4) compared to lower segments (L4-S1).
• The findings suggest that chronological age does not significantly correlate with the extent of degenerative pathology in LSS, supporting a developmental contribution to the condition.