The annulus fibrosus is the strong wrapping that makes up the outside portion of the intervertebral disc.
The nucleus pulposus (and the entireintervertebral disc) provides shock absorption for the spine.
Annular Tears
One common injury to the annulus is a tear.

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Tears can be either painful or asymptomatic.Annular tearssometimes lead to bulging or herniated discs, but not always.
But scientists and clinicians have been working on ways to strengthen and/or repair the annulus.
According to a December 2008 review article by Bron, et.
The Surgical Approach to Annulus Repair
Suturing, according to Bron, et.
is designed to contain the nucleus pulposus in a disc replacement surgery.
But it doesn’t restore lost fibers, nor does it reverse any damage.
al., a better solution than suturing.
The problem is, its much more difficult for scientists to pull off.
Tsai T, Cheng C, Chen C, Lai P.Mechanotransduction in intervertebral discs.J Cell Mol Med.
2008;17(S4):467-479. doi:10.1007/s00586-008-0745-3
Polyclinic Rehabilitation Institute.Annular tear or fissure: the great masquerader.
Repair, regenerative and supportive therapies of the annulus fibrosus: achievements and challenges.
2009;18(3):301-13. doi:10.1007/s00586-008-0856-x