What does sub-articular disc extrusion mean?

Sub-articular disc extrusion refers to the displacement of the inner material of an intervertebral disc (nucleus pulposus) through a tear in the outer layer (annulus fibrosus), occurring specifically beneath the articular surface of adjacent vertebrae. This condition can lead to nerve compression or irritation, resulting in pain, numbness, or weakness in the affected area. It typically occurs in the lumbar or cervical regions of the spine and may require medical evaluation and treatment.