A disc herniation that leans in a flexed posture with or without leaning to either side is which direction?

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Flexion biases disc material toward the midline of the spinal canal. When the spine is flexed, the posterior portion of the disc bears more load and the nucleus pulposus tends to move backward into the central canal, producing a central, midline protrusion. This central direction compresses the thecal sac rather than a single exiting nerve root, which fits a pattern where symptoms are central and may be bilateral, and the patient often adopts a forward-leaning posture to ease posterior pressure. Lateral or posterolateral directions would more typically involve the foraminal or lateral recess areas and the exiting or traversing roots, not the midline canal, which is why the central direction is the best fit here.