or abrupt bending or torsional movements of, the lower back.

Pathophysiology

The majority of disc herniations occur in the lumbar spine (95% at L4-L5 or L5-S1). The second most common site is the cervical region (C5-C6, C6-C7). The thoracic region accounts for only 1-2% of cases. Herniations usually occur postero-laterally, at the points where the annulus fibrosus is relatively thin and is not reinforced

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