CBD Intervertebral disc
Question: Why is the outer annulus fibrosis arranged in lamellae orientated at 30° to the horizontal in alternating directions?
This arrangement gives the annulus fibrosis a high tensile strength and allows it to resist distractive and shear forces
Question: Anything else?
It allows it to expand radially in response to a transferred load from the NP
Question: What is the function of the intervertebral disc?
The main function of the intervertebral disc is mechanical: it transfers loads, dissipates energy and facilitates joint mobility. The NP and AF structures act synergistically to distribute and transmit loads between the vertebral bodies
Question:What happens when a disc is compressed
When a disc is compressed, hydrostatic pressure is generated within the NP, which is constrained peripherally by the AF, generating tensile circumferential stresses within the lamellar structure Compressive loads are also supported directly by the inner AF, which is rich in proteoglycans