Which mechanism of injury is often associated with a herniated intervertebral disc in the lumbar region?

A herniated intervertebral disc in the lumbar region is often linked to repeated or prolonged flexion of the lumbar spine. This movement, especially when combined with load-bearing activities or improper lifting techniques, can lead to increased pressure on the intervertebral discs. When the spine is flexed, the nucleus pulposus (the gel-like center of the disc) can be pushed posteriorly against the annulus fibrosus (the outer ring of the disc). Over time or with excessive force, this can cause the annulus to weaken and lead to herniation, where the nucleus protrudes beyond its usual boundary.

This mechanism is particularly relevant in occupations that require frequent bending, lifting, or maintaining poor postures, which can all contribute to disc degeneration and eventual herniation. Thus, the connection between flexion and herniation is well established in kinesiology and relevant to understanding injury prevention and rehabilitation strategies in the lumbar region.