Annular tears in the dorsolumbar spine

Area of Science:

• Spinal biomechanics
• Degenerative disc disease research
• Orthopedic research

Background:

• Annular tears are common spinal pathologies.
• Understanding tear distribution and severity is crucial for diagnosing and treating back pain.
• Previous research has not fully elucidated age- and level-specific patterns of annular tears.

Purpose of the Study:

• To systematically assess the distribution and severity of anterior and posterior annular tears in the lumbar and sacral spine (D11-S1).
• To investigate the relationship between age, sex, and the occurrence of annular tears at different spinal levels.
• To identify potential etiological factors contributing to disc degeneration and associated back pain.

Main Methods:

• Analysis of 117 fresh spinal specimens from D11 to S1.
• Detailed charting of anterior and posterior annular tears in sagittal slabs.
• Statistical analysis, including age-adjusted correlation coefficients, to assess tear patterns and relationships.

Main Results:

• No significant sex differences in tear prevalence were observed.
• The incidence of multiple disc tears increased with age, though with exceptions.
• Anterior tears significantly increased in the upper lumbar spine (L1-L2) in individuals aged 50+, correlating with increased disc mobility.
• Posterior tears showed a decreasing trend from L4 to L1 in the same age group.
• Two distinct tear patterns emerged: one mechanical affecting L4-L5 in younger adults, and a degenerative pattern in older adults.

Conclusions:

• Age-related degenerative processes and mechanical factors contribute differently to spinal annular tears.
• Increased anterior tear severity and mobility in the upper lumbar spine of older adults may be a significant factor in age-related back pain.
• The findings suggest distinct pathogenic pathways for disc tears at different spinal levels and age groups.