What is a key role of a normal intervertebral disc (IVD)?

A crucial role of a normal intervertebral disc (IVD) is to permit segmental motion within the spinal column. The intervertebral discs function as shock absorbers, allowing for flexibility and movement between adjacent vertebrae. They consist of an outer layer called the annulus fibrosus, which provides strength and stability, and a gel-like center known as the nucleus pulposus, which allows for movement and distribution of forces. This design enables proper spinal mechanics, facilitating a range of motions, such as bending, twisting, and stroking, essential for maintaining normal functional activity. By accommodating these movements, intervertebral discs help maintain spinal integrity while allowing the mobility necessary for daily activities.