The intervertebral disc functions as an amphiarthrosis (slightly moveable joint) between adjacent vertebral bodies. The disc consists of the central nucleus pulposus (gelatinous, high water content in youth), the annulus fibrosus (concentric fibrocartilaginous lamellae), and the vertebral end plates. The disc allows flexion, extension, lateral bending, and rotation while absorbing and distributing compressive loads.
Intervertebral disc pathology is the most common cause of spinal pain. Disc herniation occurs when nuclear material protrudes through annular fissures to compress nerve roots (radiculopathy) or the cord (myelopathy). Degenerative disc disease (DDD) produces loss of disc height, end-plate changes (Modic), and osteophyte formation. Discography provokes concordant pain to identify painful discs before fusion. Disc replacement arthroplasty preserves motion in contrast to fusion. The disc is avascular in adults, with nutrition via diffusion through the end plates — the basis for disc degeneration vulnerability.
Annular fissure allows nuclear material to herniate posterolaterally, compressing the traversing nerve root at the affected level and producing dermatomal leg pain (sciatica), paresthesiae, and motor deficit corresponding to the root distribution; MRI confirms the herniation level and type, with surgical discectomy indicated for severe or progressive neurological deficit.
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